Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work.

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  #41   Report Post  
Eric R Snow
 
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On 09 Dec 2004 20:47:54 GMT, oEmails (Dave Baker)
wrote:

Subject: automotive engine boring on a mill
From: Anthony

Date: 08/12/04 23:54 GMT Standard Time
Message-id:

(Dave Baker) wrote in
:



snip all the rest

This thread is about the boring and honing of engine blocks for engine
reconditioning. I don't know why you and Robin keep trying to drag it
into an argument about production line metrology which has nothing to
do with the needs of a man trying to bore and hone the one engine he
has in front of him at the time so that the bores are X thou bigger
than the one set of new pistons he has in front of him at the same
time.


BTW....since you obviously didn't read enough of my post to answer my
question, and you brought the subject up again here...Just where (on the
piston) are you measuring the diameter of the piston to get the bore
size?


That's easy. You know how to accurately count the number of sheep in a field?
You count the legs and divide by four. Well on the same principle, to measure a
piston skirt you measure the i/d and add twice the skirt thickness

I understand there's no particular reason you ought to know what I do or that
I'm one of the leading specialists in engine design and theory in the UK (you
probably haven't bothered to read my website) and certainly none to know that
I've designed and made pistons. By that I mean designed and made the casting
moulds, the initial mandrel to hold and rough turn the machining datums into
the casting, researched and specified the alloy, written the computer programme
to calculate the major dimensions, section thicknesses and mass, specified the
barreling and ovality, designed an elliptical turning system to produce the
skirt profiles, researched and specified the pin bore to pin clearance and the
methods of achieving it (fine bore followed by roller burnishing, fine bore
followed by honing, reaming and/or followed by either), researched and
specified the pin material, surface hardness and dimensions, researched and
specified the ring spacing and ring groove to ring clearances.

Most of the machining was done by a friend with CNC equipment to my specs but I
did the initial rough turning and datum points for all the castings and to
prove a point made a set from scratch on my Colchester Student including making
the ring grooving tool and turning the ring grooves in, reaming the pin bores
and oval turning the skirt profiles, building the test engine and then running
that as my daily driver.

So please, no bloody stupid room 101 test questions about where the datum point
for measuring the o/d on a piston skirt is because if you really want to get
into engine theory with me I'll blow you out of the f***ing water.

Yeah Dave, but what do you really know about making pistons. I see,
from you post, that you didn't mine the bauxite, or even collect the
beer cans to melt down. You just specified the alloy. Sheesh!
Cheers,
Eric R Snow
  #42   Report Post  
Anthony
 
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jim rozen wrote in
:



This is a restatement of my experience that "the new guys always
gage parts *small* on the OD, and *large* on the bores.

This is because consider the reading correct when the micrometer
or caliper is cranked on/in there really tight. I used to tell them
to run the parts tight/loose as the case would be, to get their
lot to come in on target. But picking up a job that had been run
unsupervised by a "new guy" during the day would invariably start
with double-checking any measurement which required any kind of
sensitive feel when gaging.

Jim



Tis precisely why I prefer air gauges, and LVDT gauges, when possible.



--
Anthony

You can't 'idiot proof' anything....every time you try, they just make
better idiots.

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  #43   Report Post  
Anthony
 
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oEmails (Dave Baker) wrote in
:


That's easy. You know how to accurately count the number of sheep in a
field? You count the legs and divide by four. Well on the same
principle, to measure a piston skirt you measure the i/d and add twice
the skirt thickness


Fine, then you should already know...that it is a different location for
every engine type, and even within the types, dependent on many factors
(peak Kpa, peak rpm, C/R, pin offset, overall height, ring pack height,
land widths, compression height, combustion chamber shape, valve sizes
and placement within the cylinder, combusion gas circulation, flame
propagation shape and direction, noise and emissions requirements among
many others).



I understand there's no particular reason you ought to know what I do
or that I'm one of the leading specialists in engine design and theory
in the UK (you probably haven't bothered to read my website) and
certainly none to know that I've designed and made pistons. By that I
mean designed and made the casting moulds, the initial mandrel to hold
and rough turn the machining datums into the casting, researched and
specified the alloy, written the computer programme to calculate the
major dimensions, section thicknesses and mass, specified the
barreling and ovality, designed an elliptical turning system to
produce the skirt profiles, researched and specified the pin bore to
pin clearance and the methods of achieving it (fine bore followed by
roller burnishing, fine bore followed by honing, reaming and/or
followed by either), researched and specified the pin material,
surface hardness and dimensions, researched and specified the ring
spacing and ring groove to ring clearances.


I have looked at your site....and...regarding making pistons...
Good for you...just curious....what groove inclination did you use?




Most of the machining was done by a friend with CNC equipment to my
specs but I did the initial rough turning and datum points for all the
castings and to prove a point made a set from scratch on my Colchester
Student including making the ring grooving tool and turning the ring
grooves in, reaming the pin bores and oval turning the skirt profiles,
building the test engine and then running that as my daily driver.


Again, nice.
We produce ...ehh....somewhere in the neighborhood of 125,000 per day,
just in the plant I work.

Since you got my curiosity up...I was wondering...
What kind of tolerances did you hold on the profiles, and ovalites? How
did you measure the profile?
What shape was the ovality?...a regular, linear ovality...a double oval
shape...triple oval shape...or asymmetric? ....or did you just offset the
piston and do an eccentric relief (not true ovality).
And what was the reasoning?
Pin offset?....how much...what direction?
What surface finish requirements did you have....how much oil volume was
held?

Since you said you reamed the pin bore, obviously you did not use a form
bore (shaped bore), nor (intentionally) an oval bore, so what did you
calculate in to prevent pinboss cracking due to pin flex under load?


So please, no bloody stupid room 101 test questions about where the
datum point for measuring the o/d on a piston skirt is because if you
really want to get into engine theory with me I'll blow you out of the
f***ing water.


That I wouldn't be so sure about Dave..



--
Anthony

You can't 'idiot proof' anything....every time you try, they just make
better idiots.

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  #44   Report Post  
jim rozen
 
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In article , Anthony says...

really want to get into engine theory with me I'll blow you out of the
f***ing water.


That I wouldn't be so sure about Dave..


Uh oh. A nerd slap-down. Who's got the biggest
piston....?

This is not meant to be derogatory of course. We're
all nerds here.

I'm actually not sure on this - we may be Geeks instead.
I've been informed that nerds and geeks are different.
Nerds for example can be female apparently. But to
be a geek you have to be male.

Jim


--
==================================================
please reply to:
JRR(zero) at pkmfgvm4 (dot) vnet (dot) ibm (dot) com
==================================================
  #45   Report Post  
Dave Baker
 
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Subject: automotive engine boring on a mill
From: Eric R Snow
Date: 09/12/04 21:51 GMT Standard Time
Message-id:

On 09 Dec 2004 20:47:54 GMT,
oEmails (Dave Baker)
wrote:

Subject: automotive engine boring on a mill
From: Anthony

Date: 08/12/04 23:54 GMT Standard Time
Message-id:

(Dave Baker) wrote in
:



snip all the rest

This thread is about the boring and honing of engine blocks for engine
reconditioning. I don't know why you and Robin keep trying to drag it
into an argument about production line metrology which has nothing to
do with the needs of a man trying to bore and hone the one engine he
has in front of him at the time so that the bores are X thou bigger
than the one set of new pistons he has in front of him at the same
time.

BTW....since you obviously didn't read enough of my post to answer my
question, and you brought the subject up again here...Just where (on the
piston) are you measuring the diameter of the piston to get the bore
size?


That's easy. You know how to accurately count the number of sheep in a

field?
You count the legs and divide by four. Well on the same principle, to

measure a
piston skirt you measure the i/d and add twice the skirt thickness

I understand there's no particular reason you ought to know what I do or

that
I'm one of the leading specialists in engine design and theory in the UK

(you
probably haven't bothered to read my website) and certainly none to know

that
I've designed and made pistons. By that I mean designed and made the casting
moulds, the initial mandrel to hold and rough turn the machining datums into
the casting, researched and specified the alloy, written the computer

programme
to calculate the major dimensions, section thicknesses and mass, specified

the
barreling and ovality, designed an elliptical turning system to produce the
skirt profiles, researched and specified the pin bore to pin clearance and

the
methods of achieving it (fine bore followed by roller burnishing, fine bore
followed by honing, reaming and/or followed by either), researched and
specified the pin material, surface hardness and dimensions, researched and
specified the ring spacing and ring groove to ring clearances.

Most of the machining was done by a friend with CNC equipment to my specs

but I
did the initial rough turning and datum points for all the castings and to
prove a point made a set from scratch on my Colchester Student including

making
the ring grooving tool and turning the ring grooves in, reaming the pin

bores
and oval turning the skirt profiles, building the test engine and then

running
that as my daily driver.

So please, no bloody stupid room 101 test questions about where the datum

point
for measuring the o/d on a piston skirt is because if you really want to get
into engine theory with me I'll blow you out of the f***ing water.

Yeah Dave, but what do you really know about making pistons. I see,
from you post, that you didn't mine the bauxite, or even collect the
beer cans to melt down. You just specified the alloy. Sheesh!
Cheers,


Look we tried and we sank a couple of test drillings but there just seemed to
be a bauxite shortage in the London area. What can you do?

--
Dave Baker - Puma Race Engines (
www.pumaracing.co.uk)


  #46   Report Post  
Dave Baker
 
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Subject: automotive engine boring on a mill
From: Anthony
Date: 10/12/04 00:07 GMT Standard Time
Message-id:

(Dave Baker) wrote in
:


I have looked at your site....and...regarding making pistons...
Good for you...just curious....what groove inclination did you use?


Nil - 90 degrees to the bore.


Most of the machining was done by a friend with CNC equipment to my
specs but I did the initial rough turning and datum points for all the
castings and to prove a point made a set from scratch on my Colchester
Student including making the ring grooving tool and turning the ring
grooves in, reaming the pin bores and oval turning the skirt profiles,
building the test engine and then running that as my daily driver.


Again, nice.
We produce ...ehh....somewhere in the neighborhood of 125,000 per day,
just in the plant I work.

Since you got my curiosity up...I was wondering...
What kind of tolerances did you hold on the profiles, and ovalites?


Well, since we were aiming for tolerances on the diameter in tenths but only
had measuring equipment that read to tenths I'm sure you'll tell me we couldn't
possibly determine our tolerances without measuring equipment that read, and of
course was regularly certified, to read to hundedths.

How
did you measure the profile?


Well we measured the i/d and added twice the skirt thickness. Oh I've already
been down this route.

What shape was the ovality?...a regular, linear ovality...a double oval
shape...triple oval shape...or asymmetric? ....or did you just offset the
piston and do an eccentric relief (not true ovality).



For prototyping I wrote a computer programme that calculated the subtended
angle of intersection of a major diameter and a minor diameter for a given
offset for an offset turned pseudo ellipse. Then another programme to calculate
the shim thickness to offset a given major diameter by a given amount in a 3
jaw chuck. For production we always intended to sub the job out to a dedicated
piston manufacturer with CNC ovality capability.

And what was the reasoning?
Pin offset?....how much...what direction?


1.25 mm in the direction of the thrust side of the block. I'd heard that was
the cool side and gave the pin an easier life.


What surface finish requirements did you have....


Smoothish - but then with a bit of roughness too. It was kind of tricky to
specify.


how much oil volume was
held?


Less than a handful. But then it depended on what size hands you had I suppose.


Since you said you reamed the pin bore, obviously you did not use a form
bore (shaped bore), nor (intentionally) an oval bore, so what did you
calculate in to prevent pinboss cracking due to pin flex under load?


A big ****-off pin boss that went right up to the crown. It seemed to do the
job.




So please, no bloody stupid room 101 test questions about where the
datum point for measuring the o/d on a piston skirt is because if you
really want to get into engine theory with me I'll blow you out of the
f***ing water.


That I wouldn't be so sure about Dave..


Oh I think so.

I'm sure you know a lot about pistons if you work in a plant that makes
pistons. Could you design and make a billet crankshaft? That was the next
project. After that came Carillo style conrods from forgings and billet EN24T.
We rapidly decided it wasn't cost effective compared to the dedicated
manufacturers who were fully CNC tooled up for the job. A set was made for a
customer's race engine though and worked very nicely. They just took too long
to make.

After that came cam profile design and metallurgy and that ended up involving
tappet metallurgy because the various combinations of chill cast iron,
inductioned hardened iron and nitrided steel aren't all compatible with all the
various tappet materials. I still do a few cams for applications that can't be
bought off the shelf. My colleague still makes some semi finished blanks from
EN40B bar for vintage Bentleys for another customer but that isn't part of my
portfolio.

Valve metallurgy and shape for best flow was comparatively simple compared to
pistons and a fair proportion of my income now comes from valves I design
myself. A project that actually generated income rather than just knowledge.
They are listed on the website. Valve guides were similarly straightforward and
I make those on the Student from two main types of bronze depending on
application and combustion chamber temperatures. Not because it's cheaper than
off the shelf ones but because I can keep concentricity to nearly nil by doing
it myself which means they can be changed as required without having to recut
the valve seats and it enables me to maintain optimum port shapes.

The 4 butterfly DCOE style thottle bodies from billet aluminium took the
longest to design and prototype. I actually made money from them until my
colleague messed me about so much on the lead times I dropped them. Or we could
talk about fluid mechanics and cylinder head porting. Or I could stop showing
off and you could maybe admit that some people who build race engines at this
level do a bit more than just throw together bits that other people manufacture
without understanding how they work.
--
Dave Baker - Puma Race Engines (
www.pumaracing.co.uk)
  #47   Report Post  
Ed Huntress
 
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"Robin S." wrote in message
...

"Dave Baker" wrote in message
...
I understand there's no particular reason you ought to know what I do or
that
I'm one of the leading specialists in engine design and theory in the UK


"Never trust anyone who asks you to."


So please, no bloody stupid room 101 test questions about where the

datum
point
for measuring the o/d on a piston skirt is because if you really want to
get
into engine theory with me I'll blow you out of the f***ing water.


Now you're getting nasty Dave. You're actually not the only person here

who
cuts metal professionally.


This actually is very funny, and I'm biting my tongue...because I know who
Anthony works for, and that he's very expert at the business of making
high-end pistons in production, and I know who Dave is, and that he's a
genuine expert at making his kind of pistons. Well, to be accurate, I know
something about their companies, by reputation in Dave's case and by more
than reputation in Anthony's case. I think it's likely that both of them are
top-level piston-manufacturing experts, within their own frames of
reference.

But they're at opposite ends of the production telescope. And it really
shows. g

Ed Huntress


  #48   Report Post  
Ed Huntress
 
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"Dave Baker" wrote in message
...

Oh, hey, before I forget it, here's something relating to pistons for
hobbyists who like to fiddle around.

When I was at Wasino and we were trying to sell Ford a $7 million transfer
line for oval-turning pistons (using our then mostly-vaporware
magnetostrictive oval-turning accessory), I had to make some illustrations
for press releases and for a brochure. I had to show the barrel shape, and
the different ovality at the top and the bottom of the piston, and the
transitions.

Anyway, I was using Rhino a lot then, so we got some formulas from Ford for
a very complex piston and my boss turned them into a big Excel table of
data, each degree around the piston: 360 columns.

I added a column for a multiplier that I could use to multiply all of the
offset values in the table. Then I started plugging in multipliers and
feeding the tables of data into Rhino.

By trial and error I found values that would make the piston visibly
barrel-shaped and visibly oval. I used POV-Ray to render the models so I
could play with the lights, and we got some great-looking examples of what
piston shapes would look like to the naked eye, if the offsets are
multiplied by some very large value.

It was very tricky, because a little bit too much multiplication and you
wound up with weird, distorted shapes that totally obscured the point. But
there were values that showed what we wanted without turning the pistons
into Klein bottles.

No, I don't have any of the images anymore. But any Rhino jock could figure
out how to do it.

Ed Huntress


  #49   Report Post  
Dave Baker
 
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Subject: automotive engine boring on a mill
From: "Ed Huntress"
Date: 10/12/04 05:53 GMT Standard Time
Message-id:

"Robin S." wrote in message
m...

"Dave Baker" wrote in message
...
I understand there's no particular reason you ought to know what I do or
that
I'm one of the leading specialists in engine design and theory in the UK


"Never trust anyone who asks you to."


So please, no bloody stupid room 101 test questions about where the

datum
point
for measuring the o/d on a piston skirt is because if you really want to
get
into engine theory with me I'll blow you out of the f***ing water.


Now you're getting nasty Dave. You're actually not the only person here

who
cuts metal professionally.


This actually is very funny, and I'm biting my tongue...because I know who
Anthony works for, and that he's very expert at the business of making
high-end pistons in production, and I know who Dave is, and that he's a
genuine expert at making his kind of pistons.


I don't make pistons for a living Ed. It was a one off project about 10 years
ago. I design and build race engines and specialise in cylinder head flow
development. It's just that over the years I've looked at most of the major
components in an engine to see if myself and my colleague could make them
competitively or not. Partly to make work for his CNC shop, partly so I could
get exactly what I wanted without having to rely on other manufacturers, partly
because the only way to really understand a component is to learn what making
it entails.

Even when we decided that something was just too specialised to continue making
them in small numbers without the optimum machinery it was incredibly valuable
in terms of R&D, metallurgical knowledge etc and to an extent just being able
to say to myself, yes I can do this if I want to now. At least now when I need
something specialised I can talk to the suppliers from the POV of actually
understanding the product.

Even something as simple as a valve guide means learning about the properties
of an essentially infinite number of types of bronze, the ideal interference
fit in the head, wear properties, coefficients of expansion etc. Get to
something more involved like a piston or a camshaft profile and that complexity
expands many times over. State of the art in piston design is a million miles
away from what we ever achieved but at least I had the satisfaction of running
an engine where I could say I actually made the pistons from scratch. They were
somewhat agricultural at that stage but they worked, they didn't break and they
taught me where the finer points of the design process lay.
--
Dave Baker - Puma Race Engines (
www.pumaracing.co.uk)
  #50   Report Post  
Anthony
 
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"Ed Huntress" wrote in
:

..

This actually is very funny, and I'm biting my tongue...because I know
who Anthony works for, and that he's very expert at the business of
making high-end pistons in production, and I know who Dave is, and
that he's a genuine expert at making his kind of pistons. Well, to be
accurate, I know something about their companies, by reputation in
Dave's case and by more than reputation in Anthony's case. I think
it's likely that both of them are top-level piston-manufacturing
experts, within their own frames of reference.

But they're at opposite ends of the production telescope. And it
really shows. g

Ed Huntress




Hehe...
I've been finding this thread quite entertaining myself Ed. Kind of a
comic relief from all the daily stress. Yes, I am quite sure we are at
complete opposite ends of the spectrum.


--
Anthony

You can't 'idiot proof' anything....every time you try, they just make
better idiots.

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  #51   Report Post  
Anthony
 
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oEmails (Dave Baker) wrote in
:

Dave,
We do a lot more than pistons.
And...if you would tame that huge ego for a while and pay attention, you
might even learn a few things that will help you make better, more powerful
engines.



Nil - 90 degrees to the bore.


Should have turned them ~10-15' toward the crown, would have made more
power. (sitting on the skirt ends, grooves should go down toward the center
of the piston). Also, flatness and parallelism of the flanks is of utmost
importance. You see, this creates a double seal on the ring, which is
enhanced by the combustion forces acting on the ring. Grooves manufactured
to these specifications will seal better than gas-jet ported pistons.


Well, since we were aiming for tolerances on the diameter in tenths
but only had measuring equipment that read to tenths I'm sure you'll
tell me we couldn't possibly determine our tolerances without
measuring equipment that read, and of course was regularly certified,
to read to hundedths.


I will agree on that point.


How
did you measure the profile?


Well we measured the i/d and added twice the skirt thickness. Oh I've
already been down this route.


I do not understand how you can accurately measure the profile in this
manner. You must measure the OD in many, many places along it's length to
determine the profile. (A vertical trace is the preferred method.) And you
need a guage tip radius that averages out the specified surface roughness.




For prototyping I wrote a computer programme that calculated the
subtended angle of intersection of a major diameter and a minor
diameter for a given offset for an offset turned pseudo ellipse. Then
another programme to calculate the shim thickness to offset a given
major diameter by a given amount in a 3 jaw chuck. For production we
always intended to sub the job out to a dedicated piston manufacturer
with CNC ovality capability.


So basically, it was an eccentric cut.


And what was the reasoning?
Pin offset?....how much...what direction?


1.25 mm in the direction of the thrust side of the block. I'd heard
that was the cool side and gave the pin an easier life.


Pin offset is determined by many factors.

Smoothish - but then with a bit of roughness too. It was kind of
tricky to specify.


Should be easily specified by either RZ or RK and a feedrate.


Less than a handful. But then it depended on what size hands you had I
suppose.


Volume can be calculated from the RZ/RK + Feed + machined piston length and
diameter.




I'm sure you know a lot about pistons if you work in a plant that
makes pistons.


Maybe you missed something here Dave. I work at a company that makes
pistons, and most other engine components, yes. But I am not a 'production
line worker' as you appear to think.

Could you design and make a billet crankshaft?

Yes, on both counts.

(Aside: Ed, there is that word again.)

That was
the next project. After that came Carillo style conrods from forgings
and billet EN24T. We rapidly decided it wasn't cost effective compared
to the dedicated manufacturers who were fully CNC tooled up for the
job. A set was made for a customer's race engine though and worked
very nicely. They just took too long to make.


As mentioned previously, we also make connecting rods - forged, powdered
metal (cracked), and Titanium (limited-production specialty vehicles).


After that came cam profile design and metallurgy and that ended up
involving tappet metallurgy because the various combinations of chill
cast iron, inductioned hardened iron and nitrided steel aren't all
compatible with all the various tappet materials. I still do a few
cams for applications that can't be bought off the shelf. My colleague
still makes some semi finished blanks from EN40B bar for vintage
Bentleys for another customer but that isn't part of my portfolio.

Valve metallurgy and shape for best flow was comparatively simple
compared to pistons and a fair proportion of my income now comes from
valves I design myself. A project that actually generated income
rather than just knowledge. They are listed on the website. Valve
guides were similarly straightforward and I make those on the Student
from two main types of bronze depending on application and combustion
chamber temperatures. Not because it's cheaper than off the shelf ones
but because I can keep concentricity to nearly nil by doing it myself
which means they can be changed as required without having to recut
the valve seats and it enables me to maintain optimum port shapes.


We also make camshafts, actuation components, valves, blocks, intake
manifolds and various other engine and engine system components.

snip

Or I could stop showing off and you could maybe admit that
some people who build race engines at this level do a bit more than
just throw together bits that other people manufacture without
understanding how they work.


Show off all you want. Makes no difference to me. I know of what I speak,
and I am quietly confident in that.
I am quite familiar with race engine development, production engine
development, and many other things.

BTW: - IIRC...~14 different racing championships (that I am aware of) were
won using our components this year, as engineered and delivered, (no
modifications after arrival at the builder), including F1, IRL, and
NASCAR..... We do know a little about what we do.



--
Anthony

You can't 'idiot proof' anything....every time you try, they just make
better idiots.

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  #53   Report Post  
Robin S.
 
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"Anthony" wrote in message
...
I find this very suprising from an engine builder of the reputation such
as yours.


He's got quite the bark, but I don't see the bite...

Regards,

Robin


  #54   Report Post  
Tom
 
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Anthony wrote:

oEmails (Dave Baker) wrote in
:


No. just a bit ticked off about comments such as "it is obvious you
may not even understand what entails a quality bore"


I stand by my statement.
Your statement "Blueprinting an engine is bull****" stands behind me on
that.
There is no way your hand dial bore comparator can tell you squat about
your bore, except the relative diameter of the plane you measured (which
may not even be square to the bore.) It tells you nothing about
cylindricity, straightness, surface profile, perpendictularity to the
crank and deck, offset from crank centerline or any of the mirad of other
dimensions that are critical to wear, combustion sealing and power.
That may have been fine 30 years ago....but it does not fly today, in
either volume manufacturing....or especially, in the race world.
People pay a high premium for a high performance engine. They expect
quality above and beyond a production engine. From your own statements,
it is apparent that your quality doesn't even approach that of a modern
production engine, let alone the quality of today's true high-performance
engines. And yes, I do know what kind of quality today's race engine
builders are using.
I find this very suprising from an engine builder of the reputation such
as yours.

--
Anthony


One can wander off to
www.pumaracing.co.uk and see what Dave's
accomplished, where can one go to view your credentials and
accomplishments, that you base your opinions on?

Tom
  #55   Report Post  
Anthony
 
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Tom wrote in :



One can wander off to www.pumaracing.co.uk and see what Dave's
accomplished, where can one go to view your credentials and
accomplishments, that you base your opinions on?

Tom


Tom,
Check your email.



--
Anthony

You can't 'idiot proof' anything....every time you try, they just make
better idiots.

Remove sp to reply via email


  #56   Report Post  
Tom
 
Posts: n/a
Default

Anthony wrote:

Tom wrote in :


One can wander off to www.pumaracing.co.uk and see what Dave's
accomplished, where can one go to view your credentials and
accomplishments, that you base your opinions on?

Tom


Tom,
Check your email.

--
Anthony


Done that. Had absolutely no verifiable content..
  #57   Report Post  
Norman Yarvin
 
Posts: n/a
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In article ,
Anthony wrote:

Well, since we were aiming for tolerances on the diameter in tenths
but only had measuring equipment that read to tenths I'm sure you'll
tell me we couldn't possibly determine our tolerances without
measuring equipment that read, and of course was regularly certified,
to read to hundedths.


I will agree on that point.


Please. Having access to better measuring equipment is nice, but that's
because it allows one to be *more sloppy* when meeting a given
specification, not because it's absolutely required by the laws of
physics. If one has to maintain a tolerance of .001", then it can be
done by either:

1. using measuring equipment that is only reliable to .0004",
and making sure that the measurement is within .0006";

or

2. using measuring equipment that is reliable to .0001",
and making sure that the measurement is within .0009".

In either case the numbers add to .001". But what a production engineer
sees is that if he makes choice #1, he may be saving a few hundred
dollars, in getting a cheaper measuring tool, but he may have to rework
the entire production machinery (perhaps costing millions of dollars) so
as to get the measured errors into a narrower range, without actually
improving the delivered accuracy. This is generally a no-brainer: spend
the extra money, and get the better measuring tool.

Why stop at a factor of ten? Well, for one thing, it's a nice round
number: easy to remember, and easy to use. One can, for instance, add up
the possible errors of the chain of calibration quite easily:

10% + 1% + .1% + ... = 11.111...%.

Also, beyond that point the returns diminish very rapidly: if a factor of
20 were used, instead of 10, then the required accuracy of the measuring
instrument in the above example would be doubled, but the allowable
production tolerances would just move from .0009 to .00095 -- only a 6%
improvement.

So the standard factor of ten makes sense: it's about what most people
would choose anyway (if they are among the class of people who pay
attention to industrial standards); and standardizing puts everybody on
the same wavelength.

On the other hand, for an individual doing a one-off project, improving
measured tolerances by being more careful might cost a few hours; and the
income from a few hours of work might easily be less than the cost of the
more accurate instrument.


--
Norman Yarvin http://yarchive.net
  #58   Report Post  
PrecisionMachinisT
 
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"Tom" wrote in message
...
Anthony wrote:

Tom wrote in :


One can wander off to www.pumaracing.co.uk and see what Dave's
accomplished, where can one go to view your credentials and
accomplishments, that you base your opinions on?

Tom


Tom,
Check your email.


Done that. Had absolutely no verifiable content..


Tom,

I probly still have a handful of RFQs from them I got about 2 years ago,
effector and robotics bits and pieces for a line changeout--ended up our
shop got buried in work and we werent able to promise the required lead
times and so never did any work for them

Whether to believe it or not I guess is your option........

--

SVL


  #59   Report Post  
Tom
 
Posts: n/a
Default

PrecisionMachinisT wrote:

"Tom" wrote in message
...
Anthony wrote:

Tom wrote in :


One can wander off to www.pumaracing.co.uk and see what Dave's
accomplished, where can one go to view your credentials and
accomplishments, that you base your opinions on?

Tom

Tom,
Check your email.


Done that. Had absolutely no verifiable content..


Tom,

I probly still have a handful of RFQs from them I got about 2 years ago,
effector and robotics bits and pieces for a line changeout--ended up our
shop got buried in work and we werent able to promise the required lead
times and so never did any work for them

Whether to believe it or not I guess is your option........

--

SVL


Them?
  #60   Report Post  
PrecisionMachinisT
 
Posts: n/a
Default


"Tom" wrote in message
...
PrecisionMachinisT wrote:

"Tom" wrote in message
...
Anthony wrote:

Tom wrote in :


One can wander off to www.pumaracing.co.uk and see what Dave's
accomplished, where can one go to view your credentials and
accomplishments, that you base your opinions on?

Tom

Tom,
Check your email.


Done that. Had absolutely no verifiable content..


Tom,

I probly still have a handful of RFQs from them I got about 2 years ago,
effector and robotics bits and pieces for a line changeout--ended up our
shop got buried in work and we werent able to promise the required lead
times and so never did any work for them

Whether to believe it or not I guess is your option........

--

SVL


Them?


Yes.....

"Them" being one division of a very large multinational corporation that is
involved in the manufacturing of precision engine components, gages and
metrology, machine tools, etc.....this from the letterhead on the faxes that
I recieved of Anthony about two years ago........

Now as to *exactly* which company that is, I wont divulge that info as I
would be breaching his trust, since I know he wishes that info to not be in
the public knowledge.

Now I'm hoping I'm done here, but if you feel he's bull****ting, bluffing or
even downright lying, then don't ****ing beat around the bush--suggest
instead you just go ahead and make that call......I've no doubt at least a
dozen others who also know him fairly well will come along and attest he is
about as straight up a guy as the world has ever known.

--

SVL




  #61   Report Post  
Tom
 
Posts: n/a
Default

PrecisionMachinisT wrote:

"Tom" wrote in message
...
PrecisionMachinisT wrote:

"Tom" wrote in message
...
Anthony wrote:

Tom wrote in :


One can wander off to www.pumaracing.co.uk and see what Dave's
accomplished, where can one go to view your credentials and
accomplishments, that you base your opinions on?

Tom

Tom,
Check your email.


Done that. Had absolutely no verifiable content..

Tom,

I probly still have a handful of RFQs from them I got about 2 years ago,
effector and robotics bits and pieces for a line changeout--ended up our
shop got buried in work and we werent able to promise the required lead
times and so never did any work for them

Whether to believe it or not I guess is your option........

--

SVL


Them?


Yes.....

"Them" being one division of a very large multinational corporation that is
involved in the manufacturing of precision engine components, gages and
metrology, machine tools, etc.....this from the letterhead on the faxes that
I recieved of Anthony about two years ago........

Now as to *exactly* which company that is, I wont divulge that info as I
would be breaching his trust, since I know he wishes that info to not be in
the public knowledge.

Now I'm hoping I'm done here, but if you feel he's bull****ting, bluffing or
even downright lying, then don't ****ing beat around the bush--suggest
instead you just go ahead and make that call......I've no doubt at least a
dozen others who also know him fairly well will come along and attest he is
about as straight up a guy as the world has ever known.

--

SVL


Well you can suggest all you want, as I wouldn't know you from a
hole in the ground, and as such, your opinion counts for about the
same.

Tom
  #62   Report Post  
PrecisionMachinisT
 
Posts: n/a
Default


"Tom" wrote in message
...
PrecisionMachinisT wrote:

"Tom" wrote in message
...
PrecisionMachinisT wrote:

"Tom" wrote in message
...
Anthony wrote:

Tom wrote in

:


One can wander off to www.pumaracing.co.uk and see what Dave's
accomplished, where can one go to view your credentials and
accomplishments, that you base your opinions on?

Tom

Tom,
Check your email.


Done that. Had absolutely no verifiable content..

Tom,

I probly still have a handful of RFQs from them I got about 2 years

ago,
effector and robotics bits and pieces for a line changeout--ended up

our
shop got buried in work and we werent able to promise the required

lead
times and so never did any work for them

Whether to believe it or not I guess is your option........


Them?


Yes.....

"Them" being one division of a very large multinational corporation that

is
involved in the manufacturing of precision engine components, gages and
metrology, machine tools, etc.....this from the letterhead on the faxes

that
I recieved of Anthony about two years ago........

Now as to *exactly* which company that is, I wont divulge that info as I
would be breaching his trust, since I know he wishes that info to not be

in
the public knowledge.

Now I'm hoping I'm done here, but if you feel he's bull****ting,

bluffing or
even downright lying, then don't ****ing beat around the bush--suggest
instead you just go ahead and make that call......I've no doubt at least

a
dozen others who also know him fairly well will come along and attest he

is
about as straight up a guy as the world has ever known.


Well you can suggest all you want, as I wouldn't know you from a
hole in the ground, and as such, your opinion counts for about the
same.


As does yours......

But go ahead and discount my opinion, it's really no skin offa my balls--but
just for fun lets shoot for the dozen.

--

SVL





  #63   Report Post  
Cliff
 
Posts: n/a
Default

On Sun, 12 Dec 2004 00:25:38 -0800, "PrecisionMachinisT"
wrote:

Well you can suggest all you want, as I wouldn't know you from a
hole in the ground, and as such, your opinion counts for about the
same.


As does yours......

But go ahead and discount my opinion, it's really no skin offa my balls--but
just for fun lets shoot for the dozen.


Sounds like another gasbag, Precision.
Was he looking for work or just BSing?

Who would pay a hobbiest anyway?
--
Cliff
  #64   Report Post  
PrecisionMachinisT
 
Posts: n/a
Default


"Cliff" wrote in message
...
On Sun, 12 Dec 2004 00:25:38 -0800, "PrecisionMachinisT"
wrote:

Well you can suggest all you want, as I wouldn't know you from a
hole in the ground, and as such, your opinion counts for about the
same.


As does yours......

But go ahead and discount my opinion, it's really no skin offa my

balls--but
just for fun lets shoot for the dozen.


Sounds like another gasbag, Precision.
Was he looking for work or just BSing?

Who would pay a hobbiest anyway?


Cliff,

This "Tom" fellow seems to be saying Anthony is full of **** when it comes
to automotive manufacturing particularily when it comes to pistons, rings,
cylinder bores, gaging and the like.

--

SVL




  #65   Report Post  
Ed Huntress
 
Posts: n/a
Default

"PrecisionMachinisT" wrote in message
...

"Tom" wrote in message
...
Anthony wrote:

Tom wrote in :


One can wander off to www.pumaracing.co.uk and see what Dave's
accomplished, where can one go to view your credentials and
accomplishments, that you base your opinions on?

Tom

Tom,
Check your email.


Done that. Had absolutely no verifiable content..


Tom,

I probly still have a handful of RFQs from them I got about 2 years ago,
effector and robotics bits and pieces for a line changeout--ended up our
shop got buried in work and we werent able to promise the required lead
times and so never did any work for them

Whether to believe it or not I guess is your option........

--

SVL



I hope I'm not betraying a trust, but I know from correspondence regarding
an article I wrote a couple of years ago that Anthony works for one of the
world's premier piston-makers, probably the most sophisticated engineering
and manufacturing operations for pistons anywhere.

However, I'm not qualified to judge the degree of his knowledge, although I
believe it's considerable.

Ed Huntress




  #66   Report Post  
Cliff
 
Posts: n/a
Default

On Sun, 12 Dec 2004 09:10:22 -0800, "PrecisionMachinisT"
wrote:


"Cliff" wrote in message
.. .
On Sun, 12 Dec 2004 00:25:38 -0800, "PrecisionMachinisT"
wrote:

Well you can suggest all you want, as I wouldn't know you from a
hole in the ground, and as such, your opinion counts for about the
same.


As does yours......

But go ahead and discount my opinion, it's really no skin offa my

balls--but
just for fun lets shoot for the dozen.


Sounds like another gasbag, Precision.
Was he looking for work or just BSing?

Who would pay a hobbiest anyway?


Cliff,

This "Tom" fellow seems to be saying Anthony is full of **** when it comes
to automotive manufacturing particularily when it comes to pistons, rings,
cylinder bores, gaging and the like.


And Tom would know this how?
Has a lawnmower?
--
Cliff
  #67   Report Post  
Rhbuxton
 
Posts: n/a
Default

I really don't understand why these threads go the way they do. What happens
is that three or four people take differing opinions and start heaping personal
insults on each other. The result is that the newgroups ends up losing these
people because eventually they become tired of defending themselves. In this
case I believe that all that are involved are very knowledgeable and in the
long run have so very much to offer to people like me. Why not agree to
disagree and let it go? Your personal honor surley can not be put into
question by comments on an internet newsgroup. I really don't care if people
slam each other to hell over gun issues and politics but pistons and engines
are what this news group is all about. Please cut each other some slack and
realize this isn't like face to face confrontation in the business world. This
is the fuzzy world of the internet and you do not need to be personaly offended
by someone you will never meet or debate in the real world.
Just keep involved and answer the questions of people who need help everynow
and then, like me!!!!
Rick
  #68   Report Post  
Anthony
 
Posts: n/a
Default

"Ed Huntress" wrote in
:



I hope I'm not betraying a trust, but I know from correspondence
regarding an article I wrote a couple of years ago that Anthony works
for one of the world's premier piston-makers, probably the most
sophisticated engineering and manufacturing operations for pistons
anywhere.

However, I'm not qualified to judge the degree of his knowledge,
although I believe it's considerable.

Ed Huntress




Ed, pistons are only the start , product lines include blocks, valves,
camshafts and valvetrain components, intake manifolds, connecting rods,
bearings, rings, cylinders, cylinder liners, filters, and a variety of
other engine components.




--
Anthony

You can't 'idiot proof' anything....every time you try, they just make
better idiots.

Remove sp to reply via email
  #69   Report Post  
Ed Huntress
 
Posts: n/a
Default

"Anthony" wrote in message
...
"Ed Huntress" wrote in
:



I hope I'm not betraying a trust, but I know from correspondence
regarding an article I wrote a couple of years ago that Anthony works
for one of the world's premier piston-makers, probably the most
sophisticated engineering and manufacturing operations for pistons
anywhere.

However, I'm not qualified to judge the degree of his knowledge,
although I believe it's considerable.

Ed Huntress




Ed, pistons are only the start , product lines include blocks, valves,
camshafts and valvetrain components, intake manifolds, connecting rods,
bearings, rings, cylinders, cylinder liners, filters, and a variety of
other engine components.




--
Anthony

You can't 'idiot proof' anything....every time you try, they just make
better idiots.

Remove sp to reply via email


Yeah, I know. But the subject was pistons. 8:-)

(sorry for the odd emoticon; 'glasses are pushed up on my head today.)

Ed Huntress


  #70   Report Post  
Siggy
 
Posts: n/a
Default

Why not stop beating around the bush and just tell the group what you do and
where you do it so we may all be enlightened by the source and recipient of
your expertise?

Robert

"Anthony" wrote in message
...
"Ed Huntress" wrote in
:



I hope I'm not betraying a trust, but I know from correspondence
regarding an article I wrote a couple of years ago that Anthony works
for one of the world's premier piston-makers, probably the most
sophisticated engineering and manufacturing operations for pistons
anywhere.

However, I'm not qualified to judge the degree of his knowledge,
although I believe it's considerable.

Ed Huntress




Ed, pistons are only the start , product lines include blocks, valves,
camshafts and valvetrain components, intake manifolds, connecting rods,
bearings, rings, cylinders, cylinder liners, filters, and a variety of
other engine components.




--
Anthony

You can't 'idiot proof' anything....every time you try, they just make
better idiots.

Remove sp to reply via email





  #71   Report Post  
Robin S.
 
Posts: n/a
Default


"Siggy" wrote in message
. com...
Why not stop beating around the bush and just tell the group what you do
and
where you do it so we may all be enlightened by the source and recipient
of
your expertise?

Robert


The idea here is that anyone who has a clue already knows Anthony knows
what's going on.

Regards,

Robin


  #72   Report Post  
Siggy
 
Posts: n/a
Default

At this point there is no doubt that Anthony knows his stuff. However, for
the last several pieces of this thread there has been all of this coy talk
about his work for the premier piston builder/cam grinder/block
manufacturer/manifold maker, blah blah blah... Others are talking about
knowing of him, his work and his company, etc. I'm not trying to take
anything away from the guy, I'm simply suggesting that if he is so darned
proud of the company and its products, why not mention the name so those of
us who don't know him, his reputation or his company can be enlightened?

Robert

"Robin S." wrote in message
.. .

"Siggy" wrote in message
. com...
Why not stop beating around the bush and just tell the group what you do
and
where you do it so we may all be enlightened by the source and recipient
of
your expertise?

Robert


The idea here is that anyone who has a clue already knows Anthony knows
what's going on.

Regards,

Robin




  #73   Report Post  
Ed Huntress
 
Posts: n/a
Default

"Siggy" wrote in message
om...
At this point there is no doubt that Anthony knows his stuff. However,

for
the last several pieces of this thread there has been all of this coy talk
about his work for the premier piston builder/cam grinder/block
manufacturer/manifold maker, blah blah blah... Others are talking about
knowing of him, his work and his company, etc. I'm not trying to take
anything away from the guy, I'm simply suggesting that if he is so darned
proud of the company and its products, why not mention the name so those

of
us who don't know him, his reputation or his company can be enlightened?

Robert


I don't disagree with you, Robert, but some people here -- including people
I've met here and quoted in published articles, whose names you wouldn't
connect with the names they use here -- just can't, or don't want to, have
their presence here connected with their company or their work.

Like you, I find it frustrating sometimes. But I recognize that some people
have that need. That's the way it goes.

BTW, my name really *is* Ed Huntress. g

Ed Huntress


  #74   Report Post  
Anthony
 
Posts: n/a
Default

"Siggy" wrote in
om:

At this point there is no doubt that Anthony knows his stuff.
However, for the last several pieces of this thread there has been all
of this coy talk about his work for the premier piston builder/cam
grinder/block manufacturer/manifold maker, blah blah blah... Others
are talking about knowing of him, his work and his company, etc. I'm
not trying to take anything away from the guy, I'm simply suggesting
that if he is so darned proud of the company and its products, why not
mention the name so those of us who don't know him, his reputation or
his company can be enlightened?

Robert



Siggy,
The fact of the matter is that most of what/how we do things is highly
proprietary. When you hold a technological advantage over your
competition, you have to maintain that, especially in the vehicle
business. Company policy states that any release of that information, no
matter how inadvertent, is cause for immediate termination. I have seen
them excercise this policy more than once. Since I have a family to
support, I feel it in my best interest, and that of my family, to keep my
employer out of the newsgroups, since what I may consider proprietary
information, and what they might consider proprietary information may not
be the same. It just isn't worth the risk. I try, within the confines of
that, provide what assistance I can to the folks on the newsgroup, but I
will not put my family and my career at risk over a thread in a
newsgroup.
Those that do know me understand this situation, and I am thankful that
they have upheld my request to not mention the company.



--
Anthony

You can't 'idiot proof' anything....every time you try, they just make
better idiots.

Remove sp to reply via email
  #75   Report Post  
Siggy
 
Posts: n/a
Default

Great response, Anthony. I appreciate your taking the time to explain your
position / reasoning - it makes all of the sense in the world.

Robert

"Anthony" wrote in message
...
"Siggy" wrote in
om:

At this point there is no doubt that Anthony knows his stuff.
However, for the last several pieces of this thread there has been all
of this coy talk about his work for the premier piston builder/cam
grinder/block manufacturer/manifold maker, blah blah blah... Others
are talking about knowing of him, his work and his company, etc. I'm
not trying to take anything away from the guy, I'm simply suggesting
that if he is so darned proud of the company and its products, why not
mention the name so those of us who don't know him, his reputation or
his company can be enlightened?

Robert



Siggy,
The fact of the matter is that most of what/how we do things is highly
proprietary. When you hold a technological advantage over your
competition, you have to maintain that, especially in the vehicle
business. Company policy states that any release of that information, no
matter how inadvertent, is cause for immediate termination. I have seen
them excercise this policy more than once. Since I have a family to
support, I feel it in my best interest, and that of my family, to keep my
employer out of the newsgroups, since what I may consider proprietary
information, and what they might consider proprietary information may not
be the same. It just isn't worth the risk. I try, within the confines of
that, provide what assistance I can to the folks on the newsgroup, but I
will not put my family and my career at risk over a thread in a
newsgroup.
Those that do know me understand this situation, and I am thankful that
they have upheld my request to not mention the company.



--
Anthony

You can't 'idiot proof' anything....every time you try, they just make
better idiots.

Remove sp to reply via email



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