Is "The Kid" related to Iggy
 

My son just got a free 15" southbend from grandpa just for coming to
visit. Dad tossed in a 12" bench grinder, and a small pickup load of
tools, and a real nice monster wench. No small trip - MN to NM - 2K
miles.

Then "The Kid" just won this auction
http://auctions.machinesused.com/lis...mnum=846984426

Now he's surfing fleabay for a couple VFDs.

Karl

Is "The Kid" related to Iggy
 

On 6/11/2013 6:35 PM, Karl Townsend wrote:
... a real nice monster wench....

Kinky

Is "The Kid" related to Iggy
 

On 2013-06-11, Karl Townsend wrote:
My son just got a free 15" southbend from grandpa just for coming to
visit. Dad tossed in a 12" bench grinder, and a small pickup load of
tools, and a real nice monster wench. No small trip - MN to NM - 2K
miles.

Then "The Kid" just won this auction
http://auctions.machinesused.com/lis...mnum=846984426

Now he's surfing fleabay for a couple VFDs.

Karl

I am extremely envious!

Is "The Kid" related to Iggy
 

Ignoramus5948 fired this volley in
:

I am extremely envious!

You would only be if you were re-selling the machine.

He'll LOVE it until he gets familiar with that old BP conversion head. I
used to have one similar -- a Cinci#2 with the same head.

then... eh... BTDT. I have a number of 'wasted' tools with built-on MT2
tapers I need to shuck.


Lloyd

Is "The Kid" related to Iggy
 

Karl Townsend wrote:

My son just got a free 15" southbend from grandpa just for coming to
visit. Dad tossed in a 12" bench grinder, and a small pickup load of
tools, and a real nice monster wench. No small trip - MN to NM - 2K
miles.

Then "The Kid" just won this auction
http://auctions.machinesused.com/lis...mnum=846984426

Now he's surfing fleabay for a couple VFDs.

Karl

Why a couple of VFDs? You'll never use the hor and vert spindles at the
same time so one VFD will do fine for both.

Is "The Kid" related to Iggy
 

Karl Townsend wrote:

My son just got a free 15" southbend from grandpa just for coming to
visit. Dad tossed in a 12" bench grinder, and a small pickup load of
tools, and a real nice monster wench. No small trip - MN to NM - 2K
miles.

Then "The Kid" just won this auction
http://auctions.machinesused.com/lis...mnum=846984426

Now he's surfing fleabay for a couple VFDs.

Karl

I actually did pretty well over the weekend. I got a 1942 vintage 6x18
Norton surface grinder with hydraulic traverse and cross feed, a Brown
and Sharp mag chuck, a large selection of wheels and arbors, 5C spin
indexer, diamond dresser on a B&S mag base, small coolant pump/tank
unit, some assorted 1/2 and 1/4 Loc-Line components, a Precise S 65 high
speed spindle (needs collets and collet nut), two DuMont Minuteman
keyway broach sets, a chucking reamer set, a tub of assorted slotting
and slitting saws and a big box of assorted aluminum hunks 1/4"-3" thick
or so.

Is "The Kid" related to Iggy
 

Karl Townsend wrote:

On Tue, 11 Jun 2013 19:08:11 -0500, "Pete C."
wrote:


Karl Townsend wrote:

My son just got a free 15" southbend from grandpa just for coming to
visit. Dad tossed in a 12" bench grinder, and a small pickup load of
tools, and a real nice monster wench. No small trip - MN to NM - 2K
miles.

Then "The Kid" just won this auction
http://auctions.machinesused.com/lis...mnum=846984426

Now he's surfing fleabay for a couple VFDs.

Karl

Why a couple of VFDs? You'll never use the hor and vert spindles at the
same time so one VFD will do fine for both.

One is for the southbend lathe.

Going to use both at the same time? :)

Is "The Kid" related to Iggy
 

On Tue, 11 Jun 2013 18:36:04 -0500, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote:

Ignoramus5948 fired this volley in
:

I am extremely envious!

You would only be if you were re-selling the machine.

He'll LOVE it until he gets familiar with that old BP conversion head. I
used to have one similar -- a Cinci#2 with the same head.

then... eh... BTDT. I have a number of 'wasted' tools with built-on MT2
tapers I need to shuck.


Lloyd

"The Kid" and I agree, a BP is just a glorified drill press. But they
sure are handy for a quick slot or something minor. He won't expect
much more out of this unit. He did just con me out a complete set of
R8 tooling for it.

His work will be selling off a low hours Haas VF2 with rotary table
and touch probe this fall. That will be his goto CNC machine.

Is "The Kid" related to Iggy
 

On Tue, 11 Jun 2013 19:08:11 -0500, "Pete C."
wrote:


Karl Townsend wrote:

My son just got a free 15" southbend from grandpa just for coming to
visit. Dad tossed in a 12" bench grinder, and a small pickup load of
tools, and a real nice monster wench. No small trip - MN to NM - 2K
miles.

Then "The Kid" just won this auction
http://auctions.machinesused.com/lis...mnum=846984426

Now he's surfing fleabay for a couple VFDs.

Karl

Why a couple of VFDs? You'll never use the hor and vert spindles at the
same time so one VFD will do fine for both.

One is for the southbend lathe.

Is "The Kid" related to Iggy
 

Karl Townsend fired this volley in
:

He won't expect
much more out of this unit. He did just con me out a complete set of
R8 tooling for it.


A BP conversion head with R8 spindle taper?? REALLY?

Hmmm... I wonder if someone re-worked it (somehow... I don't see how
there's enough meat in that spindle to do that).

Lloyd

Is "The Kid" related to Iggy
 

On Tue, 11 Jun 2013 19:16:16 -0500, "Pete C."
wrote:


Karl Townsend wrote:

My son just got a free 15" southbend from grandpa just for coming to
visit. Dad tossed in a 12" bench grinder, and a small pickup load of
tools, and a real nice monster wench. No small trip - MN to NM - 2K
miles.

Then "The Kid" just won this auction
http://auctions.machinesused.com/lis...mnum=846984426

Now he's surfing fleabay for a couple VFDs.

Karl

I actually did pretty well over the weekend. I got a 1942 vintage 6x18
Norton surface grinder with hydraulic traverse and cross feed, a Brown
and Sharp mag chuck, a large selection of wheels and arbors, 5C spin
indexer, diamond dresser on a B&S mag base, small coolant pump/tank
unit, some assorted 1/2 and 1/4 Loc-Line components, a Precise S 65 high
speed spindle (needs collets and collet nut), two DuMont Minuteman
keyway broach sets, a chucking reamer set, a tub of assorted slotting
and slitting saws and a big box of assorted aluminum hunks 1/4"-3" thick
or so.

sounds like Iggy best get going, he's got competition for best
scrounger.

Karl

Is "The Kid" related to Iggy
 

On Tue, 11 Jun 2013 19:19:31 -0500, "Pete C."
wrote:


Karl Townsend wrote:

On Tue, 11 Jun 2013 19:08:11 -0500, "Pete C."
wrote:


Karl Townsend wrote:

My son just got a free 15" southbend from grandpa just for coming to
visit. Dad tossed in a 12" bench grinder, and a small pickup load of
tools, and a real nice monster wench. No small trip - MN to NM - 2K
miles.

Then "The Kid" just won this auction
http://auctions.machinesused.com/lis...mnum=846984426

Now he's surfing fleabay for a couple VFDs.

Karl

Why a couple of VFDs? You'll never use the hor and vert spindles at the
same time so one VFD will do fine for both.

One is for the southbend lathe.

Going to use both at the same time? :)

Don't give him any ideas. I'll be wiring these up with For/Off/Rev
switch and a speed pot.

Karl

Is "The Kid" related to Iggy
 

Karl Townsend wrote:

On Tue, 11 Jun 2013 19:16:16 -0500, "Pete C."
wrote:


Karl Townsend wrote:

My son just got a free 15" southbend from grandpa just for coming to
visit. Dad tossed in a 12" bench grinder, and a small pickup load of
tools, and a real nice monster wench. No small trip - MN to NM - 2K
miles.

Then "The Kid" just won this auction
http://auctions.machinesused.com/lis...mnum=846984426

Now he's surfing fleabay for a couple VFDs.

Karl

I actually did pretty well over the weekend. I got a 1942 vintage 6x18
Norton surface grinder with hydraulic traverse and cross feed, a Brown
and Sharp mag chuck, a large selection of wheels and arbors, 5C spin
indexer, diamond dresser on a B&S mag base, small coolant pump/tank
unit, some assorted 1/2 and 1/4 Loc-Line components, a Precise S 65 high
speed spindle (needs collets and collet nut), two DuMont Minuteman
keyway broach sets, a chucking reamer set, a tub of assorted slotting
and slitting saws and a big box of assorted aluminum hunks 1/4"-3" thick
or so.

sounds like Iggy best get going, he's got competition for best
scrounger.

Heh, I spent about $1,400 including diesel to go get it. If Iggy got it
he'd spend that much but it would all come pre-loaded in a nice box
truck with lift gate and low miles included in the deal.

Is "The Kid" related to Iggy
 

"Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote:

Karl Townsend fired this volley in
:

He won't expect
much more out of this unit. He did just con me out a complete set of
R8 tooling for it.


A BP conversion head with R8 spindle taper?? REALLY?

Hmmm... I wonder if someone re-worked it (somehow... I don't see how
there's enough meat in that spindle to do that).

Huh? It's a 1J head, most were R8, like mine. You could also get
quick-switch and NMTB30. Maybe you are thinking of the M head,
which had a MUCH smaller quill and spindle, and B&S #7 and MT3
were common tapers, also Bridgeport's own C taper. That certainly
could not be made to take R8.

Jon

Is "The Kid" related to Iggy
 

On 2013-06-12, Pete C. wrote:

Karl Townsend wrote:

My son just got a free 15" southbend from grandpa just for coming to
visit. Dad tossed in a 12" bench grinder, and a small pickup load of
tools, and a real nice monster wench. No small trip - MN to NM - 2K
miles.

Then "The Kid" just won this auction
http://auctions.machinesused.com/lis...mnum=846984426

Now he's surfing fleabay for a couple VFDs.

Karl

I actually did pretty well over the weekend. I got a 1942 vintage 6x18
Norton surface grinder with hydraulic traverse and cross feed, a Brown
and Sharp mag chuck, a large selection of wheels and arbors, 5C spin
indexer, diamond dresser on a B&S mag base, small coolant pump/tank
unit, some assorted 1/2 and 1/4 Loc-Line components, a Precise S 65 high
speed spindle (needs collets and collet nut), two DuMont Minuteman
keyway broach sets, a chucking reamer set, a tub of assorted slotting
and slitting saws and a big box of assorted aluminum hunks 1/4"-3" thick
or so.

Sounds fun.

i

Is "The Kid" related to Iggy
 

On 2013-06-12, Jon Elson wrote:
"Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote:

Karl Townsend fired this volley in
:

He won't expect
much more out of this unit. He did just con me out a complete set of
R8 tooling for it.


A BP conversion head with R8 spindle taper?? REALLY?

Hmmm... I wonder if someone re-worked it (somehow... I don't see how
there's enough meat in that spindle to do that).

Huh? It's a 1J head, most were R8, like mine. You could also get
quick-switch and NMTB30. Maybe you are thinking of the M head,
which had a MUCH smaller quill and spindle, and B&S #7 and MT3
were common tapers, also Bridgeport's own C taper. That certainly
could not be made to take R8.

Jon

They simlpy put a regular BP head on a different body.

Looks funny, but works, likely, better than the original.

i

Is "The Kid" related to Iggy
 

"Karl Townsend" wrote in message
...

My son just got a free 15" southbend from grandpa just for coming to
visit. Dad tossed in a 12" bench grinder, and a small pickup load of
tools, and a real nice monster wench. No small trip - MN to NM - 2K
miles.

Then "The Kid" just won this auction
http://auctions.machinesused.com/lis...mnum=846984426

Now he's surfing fleabay for a couple VFDs.

Karl

I have a Kempsmith mill very similar to that, with the Bridgeport head on
the overarm. I think my table is 12 X 50 if I remember correctly. They
seem descent, have thrust bearings on table X direction, power feed on all 3
axis. Mine has a gearbox and motor on top for the horizontal mill part,
it's 7.5HP. So I have 7.5HP power feed for my 1 HP Bridgeport head. I've
used the horizontal mill with and end mill in it before, kind of slow
turning but it does the job.

You can also look on "driveswarehouse.com" for VFD's, just to make sure
what you're seeing on eBay isn't overpriced. Also, the drive I have, Allen
Bradley 160, isn't listed as running on single phase for the model I have,
but it does just fine. It will even allow me to switch the motor on and off
while the drive is running at 60Hz without faulting out.

RogerN

Is "The Kid" related to Iggy
 

On 2013-06-12, Pete C. wrote:

Karl Townsend wrote:

On Tue, 11 Jun 2013 19:16:16 -0500, "Pete C."
wrote:


Karl Townsend wrote:

My son just got a free 15" southbend from grandpa just for coming to
visit. Dad tossed in a 12" bench grinder, and a small pickup load of
tools, and a real nice monster wench. No small trip - MN to NM - 2K
miles.

Then "The Kid" just won this auction
http://auctions.machinesused.com/lis...mnum=846984426

Now he's surfing fleabay for a couple VFDs.

Karl

I actually did pretty well over the weekend. I got a 1942 vintage 6x18
Norton surface grinder with hydraulic traverse and cross feed, a Brown
and Sharp mag chuck, a large selection of wheels and arbors, 5C spin
indexer, diamond dresser on a B&S mag base, small coolant pump/tank
unit, some assorted 1/2 and 1/4 Loc-Line components, a Precise S 65 high
speed spindle (needs collets and collet nut), two DuMont Minuteman
keyway broach sets, a chucking reamer set, a tub of assorted slotting
and slitting saws and a big box of assorted aluminum hunks 1/4"-3" thick
or so.

sounds like Iggy best get going, he's got competition for best
scrounger.

Heh, I spent about $1,400 including diesel to go get it. If Iggy got it
he'd spend that much but it would all come pre-loaded in a nice box
truck with lift gate and low miles included in the deal.

Hey, we all get great deals, good deals, and not so good deals, myself
included. What's important is

1) Always pay not more than market price for what you need
2) Always pay a lot less than the market price for stuff to be resold
3) Not to have way too much stuff that it impedes movement or cash flow

You will get great use of that grinder.

i

Is "The Kid" related to Iggy
 

Jon Elson fired this volley in news:haCdnRDg_
:

Maybe you are thinking of the M head,


Yep. I read the description, and guess I just assumed "M" head.

Lloyd

Is "The Kid" related to Iggy
 

Ignoramus5948 fired this volley in
:

They simlpy put a regular BP head on a different body.

No, not really, Ig. The conversion heads were specifically designed to
fit the overarm of horizontal mills, in order to make them become
vertical mills. They not only 'look odd', they have some unfortunate
off-axis torquing that can make them unsuitable for high milling forces.
(Never had big enough motors, anyway, because the mounting system had to
hold the motor, too)


That's not quite the same as putting Li'l Abner's face on Dick Tracy's
body.

LLoyd

Is "The Kid" related to Iggy
 

On 2013-06-12, Lloyd E. Sponenburgh lloydspinsidemindspring.com wrote:
Ignoramus5948 fired this volley in
:

They simlpy put a regular BP head on a different body.

No, not really, Ig. The conversion heads were specifically designed to
fit the overarm of horizontal mills, in order to make them become
vertical mills. They not only 'look odd', they have some unfortunate
off-axis torquing that can make them unsuitable for high milling forces.
(Never had big enough motors, anyway, because the mounting system had to
hold the motor, too)


That's not quite the same as putting Li'l Abner's face on Dick Tracy's
body.

LLoyd

OK, I finally understood what you are talking about.

i

Is "The Kid" related to Iggy
 

"Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote:

Ignoramus5948 fired this volley in
:

They simlpy put a regular BP head on a different body.

No, not really, Ig. The conversion heads were specifically designed to
fit the overarm of horizontal mills, in order to make them become
vertical mills. They not only 'look odd', they have some unfortunate
off-axis torquing that can make them unsuitable for high milling forces.
(Never had big enough motors, anyway, because the mounting system had to
hold the motor, too)
And, most of those WERE M heads, I think. They are MUCH lighter than
the J head, no power feed, no back gear, but you got higher speeds
with 6 belt grooves. I upgraded my round-ram M head machine to a
1J head, and while it is a true Frankenstein hack, it works a LOT better!

Jon

Is "The Kid" related to Iggy
 

"Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote:

Jon Elson fired this volley in news:haCdnRDg_
:

Maybe you are thinking of the M head,


Yep. I read the description, and guess I just assumed "M" head.

The M head may have been pretty good in 1938, but I had a lot of trouble
with poor stiffness. The J head (although mine is QUITE beat) is
just WAY stiffer. You really can tell the difference when using
a boring head, but otherwise it still helps.

Jon

Is "The Kid" related to Iggy
 

I did not start this bragging competition, and that's my excuse for
posting the following: I just bought two "optical flats", 28 inches
diameter, for $50 each plus auction buyer's premium. Then some company
guy told me, Igor, do you know what you bought, I said kinda sorta,
and he said, they cost a million dollars each, they had to grow the
glass in a special chamber.

i

Is "The Kid" related to Iggy
 

Ignoramus21475 fired this volley in
:

Then some company
guy told me, Igor, do you know what you bought, I said kinda sorta,
and he said, they cost a million dollars each, they had to grow the
glass in a special chamber.



Yeah, but Ig, they aren't worth a bunch of melted-down Mason Jars, if you
can't sell 'em!

(I know what they are, and once in my life, I could have used one)

LLoyd

Is "The Kid" related to Iggy
 

On Wed, 12 Jun 2013 15:13:17 -0500, Ignoramus21475
wrote:

I did not start this bragging competition, and that's my excuse for
posting the following: I just bought two "optical flats", 28 inches
diameter, for $50 each plus auction buyer's premium. Then some company
guy told me, Igor, do you know what you bought, I said kinda sorta,
and he said, they cost a million dollars each, they had to grow the
glass in a special chamber.

Faskinatin' stuff, Ig. http://en.wikipedia.org/wiki/Optical_flat

Sooo, what are you going to do with them? I'm guessing that laser
interferometers (grabbed out of near-space) and other electronic
wizardries have replaced the opticals.

--
I have never understood why it is "greed" to want to keep the money you
have earned, but it is not greed to want take someone else's money.
--Thomas Sowell

Is "The Kid" related to Iggy
 

On Wed, 12 Jun 2013 13:50:02 -0700, Larry Jaques
wrote:

On Wed, 12 Jun 2013 15:13:17 -0500, Ignoramus21475
wrote:

I did not start this bragging competition, and that's my excuse for
posting the following: I just bought two "optical flats", 28 inches
diameter, for $50 each plus auction buyer's premium. Then some company
guy told me, Igor, do you know what you bought, I said kinda sorta,
and he said, they cost a million dollars each, they had to grow the
glass in a special chamber.

Faskinatin' stuff, Ig. http://en.wikipedia.org/wiki/Optical_flat

Sooo, what are you going to do with them? I'm guessing that laser
interferometers (grabbed out of near-space) and other electronic
wizardries have replaced the opticals.

Not for determining flatness. Small ones are used in metrology labs
for certification, although I never heard of one that large, and I
assume it's used for some purpose in optical equipment, not for
measuring flatness of gages.

But that's just a guess.

--
Ed Huntress

Is "The Kid" related to Iggy
 

Larry Jaques fired this volley in
:

Sooo, what are you going to do with them? I'm guessing that laser
interferometers (grabbed out of near-space) and other electronic
wizardries have replaced the opticals.

Folks still use 'flats' to check other glass optics against; less and
less, though.

The other tools are finally coming down in price to the point where
optical flats won't be necessary at all in another 10-15 years (except
for amateur telescope makers who grind their own optics).

LLoyd

Is "The Kid" related to Iggy
 

On 06/12/2013 01:56 PM, Lloyd E. Sponenburgh wrote:
Larry Jaques fired this volley in
:

Sooo, what are you going to do with them? I'm guessing that laser
interferometers (grabbed out of near-space) and other electronic
wizardries have replaced the opticals.

Folks still use 'flats' to check other glass optics against; less and
less, though.

The other tools are finally coming down in price to the point where
optical flats won't be necessary at all in another 10-15 years (except
for amateur telescope makers who grind their own optics).

That was my first thought, to repurpose them as telescope mirrors
(assuming they are thick enough). 28 inches would make a pretty nice
light bucket to play with.

Jon

Is "The Kid" related to Iggy
 

On 2013-06-12, Lloyd E. Sponenburgh lloydspinsidemindspring.com wrote:
Ignoramus21475 fired this volley in
:

Then some company
guy told me, Igor, do you know what you bought, I said kinda sorta,
and he said, they cost a million dollars each, they had to grow the
glass in a special chamber.



Yeah, but Ig, they aren't worth a bunch of melted-down Mason Jars, if you
can't sell 'em!

So, do you think that I can sell them for something?

I thought, I would put them on auction.

(I know what they are, and once in my life, I could have used one)

LLoyd

Is "The Kid" related to Iggy
 

Ignoramus21475 fired this volley in
:

So, do you think that I can sell them for something?

I really don't know. When I made my own diagonals for Newtonian 'scopes,
I ground my own flats for interference-pattern checking.

With very little skill, and a LOT of patient labor, one can grind two
mated hunks of glass down to within 1/8 wavelength of flat -- actually
quite easily, if you have the time and are willing to put in the labor.

I think a prior post about their being useful as mirror blanks might be a
good tack to take. A 28" mirror would be a killer amateur collector!

LLoyd

Is "The Kid" related to Iggy
 

On 2013-06-12, Larry Jaques wrote:
On Wed, 12 Jun 2013 15:13:17 -0500, Ignoramus21475
wrote:

I did not start this bragging competition, and that's my excuse for
posting the following: I just bought two "optical flats", 28 inches
diameter, for $50 each plus auction buyer's premium. Then some company
guy told me, Igor, do you know what you bought, I said kinda sorta,
and he said, they cost a million dollars each, they had to grow the
glass in a special chamber.

Faskinatin' stuff, Ig. http://en.wikipedia.org/wiki/Optical_flat

Sooo, what are you going to do with them? I'm guessing that laser
interferometers (grabbed out of near-space) and other electronic
wizardries have replaced the opticals.


I am gonna sell them, that's for sure. One optical flat lays on
styrofoam, and has some imperfections, the other one "Unertl" stays
vertically in a super heavy enclosure, shielded by a locking shield,
and looks perfect.

i

Is "The Kid" related to Iggy
 

On 2013-06-12, Ed Huntress wrote:
On Wed, 12 Jun 2013 13:50:02 -0700, Larry Jaques
wrote:

On Wed, 12 Jun 2013 15:13:17 -0500, Ignoramus21475
wrote:

I did not start this bragging competition, and that's my excuse for
posting the following: I just bought two "optical flats", 28 inches
diameter, for $50 each plus auction buyer's premium. Then some company
guy told me, Igor, do you know what you bought, I said kinda sorta,
and he said, they cost a million dollars each, they had to grow the
glass in a special chamber.

Faskinatin' stuff, Ig. http://en.wikipedia.org/wiki/Optical_flat

Sooo, what are you going to do with them? I'm guessing that laser
interferometers (grabbed out of near-space) and other electronic
wizardries have replaced the opticals.

Not for determining flatness. Small ones are used in metrology labs
for certification, although I never heard of one that large, and I
assume it's used for some purpose in optical equipment, not for
measuring flatness of gages.

But that's just a guess.


They used them to make huge cameras for spy satellites and spy drones.

i

Is "The Kid" related to Iggy
 

Ignoramus21475 fired this volley in
:

They used them to make huge cameras for spy satellites and spy drones.


Prolly not 'used' in the sense of being materials for those cameras, but
rather to check flatness of other optics.

Lloyd

Is "The Kid" related to Iggy
 

On 2013-06-12, Lloyd E. Sponenburgh lloydspinsidemindspring.com wrote:
Ignoramus21475 fired this volley in
:

So, do you think that I can sell them for something?

I really don't know. When I made my own diagonals for Newtonian 'scopes,
I ground my own flats for interference-pattern checking.

With very little skill, and a LOT of patient labor, one can grind two
mated hunks of glass down to within 1/8 wavelength of flat -- actually
quite easily, if you have the time and are willing to put in the labor.

I think a prior post about their being useful as mirror blanks might be a
good tack to take. A 28" mirror would be a killer amateur collector!

LLoyd

Keep in mind, say, if you make a 7" flat, and spend X hours of labor,
a 28" flat would involve 16X labor. And more importantly, keeping the
tolerance across a much larger surface is so much more
difficult. Everyting works against you.

Is "The Kid" related to Iggy
 

On 2013-06-12, Lloyd E. Sponenburgh lloydspinsidemindspring.com wrote:
Ignoramus21475 fired this volley in
:

They used them to make huge cameras for spy satellites and spy drones.


Prolly not 'used' in the sense of being materials for those cameras, but
rather to check flatness of other optics.

Right. They said that they purpose made satellites so that Democrats
could spy on NRA members.

i

Is "The Kid" related to Iggy
 

Ignoramus21475 fired this volley in
:


Keep in mind, say, if you make a 7" flat, and spend X hours of labor,
a 28" flat would involve 16X labor.

I disagree. Except for final 'figuring' the labor to make a 1" flat or a
12" flat is about the same. It takes many hours, but the grinding
proceeds at a rate corresponding to the linear material removal rate
perpendicular to the surface, not at a rate dependent upon the area of
the surface.

Think of it like plunge-cutting with a 1/4" milling cutter vs. a 1"
cutter in the same material. It takes more horsepower to turn the bigger
mill, but you still plunge at the same chip load (rate).

With grinding flats, the 'horsepower' is mostly supplied by the weight of
the blanks. All you have to do is slide them back and forth (and figure
8s, and zig-zags) across one-another. But it takes little effort unless
you get stupid and let the water between them dry out (DAMHIKT!).

Lloyd




LLoyd

Is "The Kid" related to Iggy
 

Right. They said that they purpose made satellites so that Democrats
could spy on NRA members.

i

Maybe you could sell them to IRS agents for spying on Tea party
members.

Karl

Is "The Kid" related to Iggy
 

On 2013-06-12, Karl Townsend wrote:

Right. They said that they purpose made satellites so that Democrats
could spy on NRA members.

i

Maybe you could sell them to IRS agents for spying on Tea party
members.


great marketing plan!

I thought about that story and in the final analysis, it left a very
bad taste in my mouth.

i

Is "The Kid" related to Iggy
 

On Jun 12, 5:30*pm, Ignoramus21475 ignoramus21...@NOSPAM.
21475.invalid wrote:

I did not start this bragging competition, and that's my excuse for
posting the following: I just bought two "optical flats", 28 inches
diameter, for $50 each plus auction buyer's premium. Then some company
guy told me, Igor, do you know what you bought, I said kinda sorta,
and he said, they cost a million dollars each, they had to grow the
glass in a special chamber.



I am gonna sell them, that's for sure. One optical flat lays on
styrofoam, and has some imperfections, the other one "Unertl" stays
vertically in a super heavy enclosure, shielded by a locking shield,
and looks perfect.

i


Do you know what material they are made of? Back in Washington State
I worked on the Battlepoint Observatory.
Their mirror is 27.5 inches in diameter and made of Zerodur, a
extremely low coef of expansion material. They got the blank from
Boeing , it was ground for some star wars project. So they built a
grinding machine to regrind it for a mirror.

See http://www.bpastro.org/index.php?pag...chie-telescope

And see http://www.bpastro.org/index.php?pag...d-of-directors for
the directors. You might contact Malcolm Saunders about selling the
flats. Ho might know someone who is looking for a large blank.

I am in a photo with John Rudolph on thils page.

http://www.bpastro.org/index.php?pag...chie-telescope


Dan