I keep running into an issue with spiral reamers that leave what appears
to be rifling in anything (aluminum) that I ream.

changing speed and feed rates doesn't seem to matter. Dry or with cutting
oil doesn't seem to matter either.

The straight reamers of the same size don't seem to have this problem.

What might be causing this, or how does one stop it?

On Mon, 24 Mar 2014 19:47:31 +0000, Cydrome Leader wrote:

I keep running into an issue with spiral reamers that leave what appears
to be rifling in anything (aluminum) that I ream.

changing speed and feed rates doesn't seem to matter. Dry or with
cutting oil doesn't seem to matter either.

The straight reamers of the same size don't seem to have this problem.

What might be causing this, or how does one stop it?

Use straight reamers?

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

On Monday, March 24, 2014 12:47:31 PM UTC-7, Cydrome Leader wrote:
I keep running into an issue with spiral reamers that leave what appears

to be rifling in anything (aluminum) that I ream.



changing speed and feed rates doesn't seem to matter. Dry or with cutting

oil doesn't seem to matter either.



The straight reamers of the same size don't seem to have this problem.



What might be causing this, or how does one stop it?


Sounds like chip build up on the reamer.

Is it a through hole?

Can you stop the reamer and clean it when it pokes through?

Usually spiral reamers leave a better finish.

Tim Wescott wrote:
On Mon, 24 Mar 2014 19:47:31 +0000, Cydrome Leader wrote:

I keep running into an issue with spiral reamers that leave what appears
to be rifling in anything (aluminum) that I ream.

changing speed and feed rates doesn't seem to matter. Dry or with
cutting oil doesn't seem to matter either.

The straight reamers of the same size don't seem to have this problem.

What might be causing this, or how does one stop it?

Use straight reamers?

heh, yeah.

Is this "normal" behavior? I can't quite figure out how it leaves such
distinct marks that appear to match the shape of the cutting flutes,
unless it's somehow bouncing around backwards like when a shaft is in a
worn bearing and it makes that horrible chatter. I've been following the
drill 1/64th undersize tip.

On Mon, 24 Mar 2014 14:57:49 -0500, Tim Wescott
wrote:

On Mon, 24 Mar 2014 19:47:31 +0000, Cydrome Leader wrote:

I keep running into an issue with spiral reamers that leave what appears
to be rifling in anything (aluminum) that I ream.

changing speed and feed rates doesn't seem to matter. Dry or with
cutting oil doesn't seem to matter either.

The straight reamers of the same size don't seem to have this problem.

What might be causing this, or how does one stop it?

Use straight reamers?

Is he using pot-aluminum? Y'know, that mushy crap which won't drill
worth a hoot? It sticks to the flutes of the drill bit and rips a hole
wider in some areas. Maybe he just needs a better grade of aluminum.

--
The most decisive actions of our life - I mean those that are most
likely to decide the whole course of our future - are, more often
than not, unconsidered.
-- Andre Gide

On Mon, 24 Mar 2014 21:35:08 +0000 (UTC), Cydrome Leader
wrote:

Tim Wescott wrote:
On Mon, 24 Mar 2014 19:47:31 +0000, Cydrome Leader wrote:

I keep running into an issue with spiral reamers that leave what appears
to be rifling in anything (aluminum) that I ream.

changing speed and feed rates doesn't seem to matter. Dry or with
cutting oil doesn't seem to matter either.

The straight reamers of the same size don't seem to have this problem.

What might be causing this, or how does one stop it?

Use straight reamers?

heh, yeah.

Is this "normal" behavior? I can't quite figure out how it leaves such
distinct marks that appear to match the shape of the cutting flutes,
unless it's somehow bouncing around backwards like when a shaft is in a
worn bearing and it makes that horrible chatter. I've been following the
drill 1/64th undersize tip.

It sounds as though the reamers are chattering. Are the spiral reamers
"machine reamers", if not 0.017" might be a trifle too large a cut.
General practice seems to be a cut of ~0.015 in a half inch hole for a
machine reamer and from 0.001 - 0.113 for a hand reamer.
--
Cheers,

John B.

On 3/24/2014 7:53 PM, Larry Jaques wrote:
On Mon, 24 Mar 2014 14:57:49 -0500, Tim Wescott
wrote:

On Mon, 24 Mar 2014 19:47:31 +0000, Cydrome Leader wrote:

I keep running into an issue with spiral reamers that leave what appears
to be rifling in anything (aluminum) that I ream.

changing speed and feed rates doesn't seem to matter. Dry or with
cutting oil doesn't seem to matter either.

The straight reamers of the same size don't seem to have this problem.

What might be causing this, or how does one stop it?
Use straight reamers?
Is he using pot-aluminum? Y'know, that mushy crap which won't drill
worth a hoot? It sticks to the flutes of the drill bit and rips a hole
wider in some areas. Maybe he just needs a better grade of aluminum.

--
The most decisive actions of our life - I mean those that are most
likely to decide the whole course of our future - are, more often
than not, unconsidered.
-- Andre Gide
Pot aluminum??

You mean 6063-T5(whatever)?

On Tue, 25 Mar 2014 07:55:03 +0700, John B.
wrote:

On Mon, 24 Mar 2014 21:35:08 +0000 (UTC), Cydrome Leader
wrote:

Tim Wescott wrote:
On Mon, 24 Mar 2014 19:47:31 +0000, Cydrome Leader wrote:

I keep running into an issue with spiral reamers that leave what appears
to be rifling in anything (aluminum) that I ream.

changing speed and feed rates doesn't seem to matter. Dry or with
cutting oil doesn't seem to matter either.

The straight reamers of the same size don't seem to have this problem.

What might be causing this, or how does one stop it?

Use straight reamers?

heh, yeah.

Is this "normal" behavior? I can't quite figure out how it leaves such
distinct marks that appear to match the shape of the cutting flutes,
unless it's somehow bouncing around backwards like when a shaft is in a
worn bearing and it makes that horrible chatter. I've been following the
drill 1/64th undersize tip.

It sounds as though the reamers are chattering. Are the spiral reamers
"machine reamers", if not 0.017" might be a trifle too large a cut.
General practice seems to be a cut of ~0.015 in a half inch hole for a
machine reamer and from 0.001 - 0.113 for a hand reamer.

Correction from 0.001 - 0.003 :-)
--
Cheers,

John B.

"jon_banquer" wrote in message
...
On Monday, March 24, 2014 12:47:31 PM UTC-7, Cydrome Leader wrote:
I keep running into an issue with spiral reamers that leave what appears

to be rifling in anything (aluminum) that I ream.



changing speed and feed rates doesn't seem to matter. Dry or with cutting

oil doesn't seem to matter either.



The straight reamers of the same size don't seem to have this problem.



What might be causing this, or how does one stop it?


Sounds like chip build up on the reamer.

Is it a through hole?

Can you stop the reamer and clean it when it pokes through?

Usually spiral reamers leave a better finish.


I used to actually give a damn.

jon_banquer wrote:
On Monday, March 24, 2014 12:47:31 PM UTC-7, Cydrome Leader wrote:
I keep running into an issue with spiral reamers that leave what appears

to be rifling in anything (aluminum) that I ream.



changing speed and feed rates doesn't seem to matter. Dry or with cutting

oil doesn't seem to matter either.



The straight reamers of the same size don't seem to have this problem.



What might be causing this, or how does one stop it?


Sounds like chip build up on the reamer.

Is it a through hole?

it's through hole. chip build up doesn't seem to be a problem. The rifling
starts immediately.

Can you stop the reamer and clean it when it pokes through?

yeah, it doesn't appear to be the cause. It will happen at any depth, be
it 1/4 or an 1".

Usually spiral reamers leave a better finish.

not this one at least.

Larry Jaques wrote:
On Mon, 24 Mar 2014 14:57:49 -0500, Tim Wescott
wrote:

On Mon, 24 Mar 2014 19:47:31 +0000, Cydrome Leader wrote:

I keep running into an issue with spiral reamers that leave what appears
to be rifling in anything (aluminum) that I ream.

changing speed and feed rates doesn't seem to matter. Dry or with
cutting oil doesn't seem to matter either.

The straight reamers of the same size don't seem to have this problem.

What might be causing this, or how does one stop it?

Use straight reamers?

Is he using pot-aluminum? Y'know, that mushy crap which won't drill
worth a hoot? It sticks to the flutes of the drill bit and rips a hole
wider in some areas. Maybe he just needs a better grade of aluminum.

it's 6061-t rod, and some other scraps that were laying around.

John B. wrote:
On Mon, 24 Mar 2014 21:35:08 +0000 (UTC), Cydrome Leader
wrote:

Tim Wescott wrote:
On Mon, 24 Mar 2014 19:47:31 +0000, Cydrome Leader wrote:

I keep running into an issue with spiral reamers that leave what appears
to be rifling in anything (aluminum) that I ream.

changing speed and feed rates doesn't seem to matter. Dry or with
cutting oil doesn't seem to matter either.

The straight reamers of the same size don't seem to have this problem.

What might be causing this, or how does one stop it?

Use straight reamers?

heh, yeah.

Is this "normal" behavior? I can't quite figure out how it leaves such
distinct marks that appear to match the shape of the cutting flutes,
unless it's somehow bouncing around backwards like when a shaft is in a
worn bearing and it makes that horrible chatter. I've been following the
drill 1/64th undersize tip.

It sounds as though the reamers are chattering. Are the spiral reamers
"machine reamers", if not 0.017" might be a trifle too large a cut.

It's no imprinted as such, but it's just a rod about 6" long with spiral
cutters about 1-1/2" long one one side. There's nothing to make it look
like you'd use it with a hand or t-handle as a hand tool.

General practice seems to be a cut of ~0.015 in a half inch hole for a
machine reamer and from 0.001 - 0.113 for a hand reamer.

Cydrome Leader fired this volley in news:lgsd8v
:

It's no imprinted as such, but it's just a rod about 6" long with spiral
cutters about 1-1/2" long one one side. There's nothing to make it look
like you'd use it with a hand or t-handle as a hand tool.



How deeply are you reaming?
Further than 1-1/2"?

Lloyd

On Tuesday, March 25, 2014 10:05:09 AM UTC-7, Cydrome Leader wrote:
jon_banquer wrote:

On Monday, March 24, 2014 12:47:31 PM UTC-7, Cydrome Leader wrote:

I keep running into an issue with spiral reamers that leave what appears



to be rifling in anything (aluminum) that I ream.







changing speed and feed rates doesn't seem to matter. Dry or with cutting



oil doesn't seem to matter either.







The straight reamers of the same size don't seem to have this problem.







What might be causing this, or how does one stop it?





Sounds like chip build up on the reamer.



Is it a through hole?



it's through hole. chip build up doesn't seem to be a problem. The rifling

starts immediately.



Can you stop the reamer and clean it when it pokes through?



yeah, it doesn't appear to be the cause. It will happen at any depth, be

it 1/4 or an 1".



Usually spiral reamers leave a better finish.



not this one at least.


What are you holding the spiral reamer with?

On Tuesday, March 25, 2014 9:19:53 AM UTC-7, PrecisionmachinisT wrote:
"jon_banquer" wrote in message

...

On Monday, March 24, 2014 12:47:31 PM UTC-7, Cydrome Leader wrote:

I keep running into an issue with spiral reamers that leave what appears



to be rifling in anything (aluminum) that I ream.







changing speed and feed rates doesn't seem to matter. Dry or with cutting



oil doesn't seem to matter either.







The straight reamers of the same size don't seem to have this problem.







What might be causing this, or how does one stop it?





Sounds like chip build up on the reamer.



Is it a through hole?



Can you stop the reamer and clean it when it pokes through?



Usually spiral reamers leave a better finish.





I used to actually give a damn.

?

Lloyd E. Sponenburgh lloydspinsidemindspring.com wrote:
Cydrome Leader fired this volley in news:lgsd8v
:

It's no imprinted as such, but it's just a rod about 6" long with spiral
cutters about 1-1/2" long one one side. There's nothing to make it look
like you'd use it with a hand or t-handle as a hand tool.



How deeply are you reaming?
Further than 1-1/2"?

just a half inch, or that's as fast as I've bothered with this one reamer.

jon_banquer wrote:
On Tuesday, March 25, 2014 10:05:09 AM UTC-7, Cydrome Leader wrote:
jon_banquer wrote:

On Monday, March 24, 2014 12:47:31 PM UTC-7, Cydrome Leader wrote:

I keep running into an issue with spiral reamers that leave what appears



to be rifling in anything (aluminum) that I ream.







changing speed and feed rates doesn't seem to matter. Dry or with cutting



oil doesn't seem to matter either.







The straight reamers of the same size don't seem to have this problem.







What might be causing this, or how does one stop it?





Sounds like chip build up on the reamer.



Is it a through hole?



it's through hole. chip build up doesn't seem to be a problem. The rifling

starts immediately.



Can you stop the reamer and clean it when it pokes through?



yeah, it doesn't appear to be the cause. It will happen at any depth, be

it 1/4 or an 1".



Usually spiral reamers leave a better finish.



not this one at least.


What are you holding the spiral reamer with?

3 jaw chuck in a tailstock.

Cydrome Leader fired this volley in
:

just a half inch, or that's as fast as I've bothered with this one
reamer.

Then it sounds like, despite all care, it's not exactly perpendicular to
the hole, or running slightly eccentric; Enough so that one area is
cutting more aggressively than another -- and since they go all the way
around the bore, I'm suspecting eccentric to the shaft.

Where did you get this reamer, and what is: 1) its diameter, and 2) its
cost/provenance.

How are you driving it?

Lloyd

Lloyd E. Sponenburgh lloydspinsidemindspring.com wrote:
Cydrome Leader fired this volley in
:

just a half inch, or that's as fast as I've bothered with this one
reamer.

Then it sounds like, despite all care, it's not exactly perpendicular to
the hole, or running slightly eccentric; Enough so that one area is
cutting more aggressively than another -- and since they go all the way
around the bore, I'm suspecting eccentric to the shaft.

Where did you get this reamer, and what is: 1) its diameter, and 2) its
cost/provenance.

1) 0.250" x 6"
2) unknown, was new in packaging, chinese origin, fit and finish seem
good.

How are you driving it?

it's being driven into the work by turning the crank on the lathe's
tailstock. The lathe is a sherline, so everything is tiny.

On Tuesday, March 25, 2014 10:41:54 AM UTC-7, Cydrome Leader wrote:
jon_banquer wrote:

On Tuesday, March 25, 2014 10:05:09 AM UTC-7, Cydrome Leader wrote:

jon_banquer wrote:



On Monday, March 24, 2014 12:47:31 PM UTC-7, Cydrome Leader wrote:



I keep running into an issue with spiral reamers that leave what appears







to be rifling in anything (aluminum) that I ream.















changing speed and feed rates doesn't seem to matter. Dry or with cutting







oil doesn't seem to matter either.















The straight reamers of the same size don't seem to have this problem.















What might be causing this, or how does one stop it?











Sounds like chip build up on the reamer.







Is it a through hole?







it's through hole. chip build up doesn't seem to be a problem. The rifling



starts immediately.







Can you stop the reamer and clean it when it pokes through?







yeah, it doesn't appear to be the cause. It will happen at any depth, be



it 1/4 or an 1".







Usually spiral reamers leave a better finish.







not this one at least.





What are you holding the spiral reamer with?



3 jaw chuck in a tailstock.

Check the alinement of the tailstock. I think something is off. You can start by doing something like this:

http://www.youtube.com/watch?v=AtYi-mXS4O0

On Tuesday, March 25, 2014 11:53:22 AM UTC-7, jon_banquer wrote:
On Tuesday, March 25, 2014 10:41:54 AM UTC-7, Cydrome Leader wrote:

jon_banquer wrote:



On Tuesday, March 25, 2014 10:05:09 AM UTC-7, Cydrome Leader wrote:



jon_banquer wrote:







On Monday, March 24, 2014 12:47:31 PM UTC-7, Cydrome Leader wrote:







I keep running into an issue with spiral reamers that leave what appears















to be rifling in anything (aluminum) that I ream.































changing speed and feed rates doesn't seem to matter. Dry or with cutting















oil doesn't seem to matter either.































The straight reamers of the same size don't seem to have this problem.































What might be causing this, or how does one stop it?























Sounds like chip build up on the reamer.















Is it a through hole?















it's through hole. chip build up doesn't seem to be a problem. The rifling







starts immediately.















Can you stop the reamer and clean it when it pokes through?















yeah, it doesn't appear to be the cause. It will happen at any depth, be







it 1/4 or an 1".















Usually spiral reamers leave a better finish.















not this one at least.











What are you holding the spiral reamer with?







3 jaw chuck in a tailstock.



Check the alinement of the tailstock. I think something is off. You can start by doing something like this:



http://www.youtube.com/watch?v=AtYi-mXS4O0

If that's okay progress with checking the alinement of the actual reamer to your hole.

Cydrome Leader fired this volley in news:lgsj7h
:


it's being driven into the work by turning the crank on the lathe's
tailstock. The lathe is a sherline, so everything is tiny.

yeah... that's not all there is to "driven". Depth per rotation, etc....

ANYway... Even if you assume the reamer is perfect, there's little chance
that the tailstock of a Sherline is either aligned in X OR parallel to
the headstock. Because the straight reamers cut on their entire length
all at once, that could be accommodated by them simply by BENDING the
shank enough to get the reamer in alignment with the hole.

If the alignment and the reamer were perfect, a spiral reamer _would_ cut
on all surfaces at once. But bend it a little, and it cuts
preferentially on one "lobe" of an edge.

As others have said, I think you have an alignment problem.

LLoyd

"Lloyd E. Sponenburgh" lloydspinsidemindspring.com fired this volley in
. 3.70:

As others have said, I think you have an alignment problem.

PS... 'bet you're holding it in a drill chuck, too. Yes?

(hint... It wouldn't be straight on your life... G)

Lloyd

On Tuesday, March 25, 2014 12:52:29 PM UTC-7, Lloyd E. Sponenburgh wrote:
"Lloyd E. Sponenburgh" lloydspinsidemindspring.com fired this volley in

. 3.70:



As others have said, I think you have an alignment problem.



PS... 'bet you're holding it in a drill chuck, too. Yes?



(hint... It wouldn't be straight on your life... G)



Lloyd

I prefer to hold reamers in collets. Less problems with possible run out issues.

jon_banquer wrote:
On Tuesday, March 25, 2014 10:41:54 AM UTC-7, Cydrome Leader wrote:
jon_banquer wrote:

On Tuesday, March 25, 2014 10:05:09 AM UTC-7, Cydrome Leader wrote:

jon_banquer wrote:



On Monday, March 24, 2014 12:47:31 PM UTC-7, Cydrome Leader wrote:



I keep running into an issue with spiral reamers that leave what appears







to be rifling in anything (aluminum) that I ream.















changing speed and feed rates doesn't seem to matter. Dry or with cutting







oil doesn't seem to matter either.















The straight reamers of the same size don't seem to have this problem.















What might be causing this, or how does one stop it?











Sounds like chip build up on the reamer.







Is it a through hole?







it's through hole. chip build up doesn't seem to be a problem. The rifling



starts immediately.







Can you stop the reamer and clean it when it pokes through?







yeah, it doesn't appear to be the cause. It will happen at any depth, be



it 1/4 or an 1".







Usually spiral reamers leave a better finish.







not this one at least.





What are you holding the spiral reamer with?



3 jaw chuck in a tailstock.

Check the alinement of the tailstock. I think something is off. You can start by doing something like this:

http://www.youtube.com/watch?v=AtYi-mXS4O0

will have to try that rule trick.

shop dog has some great recipies by the way- I tried the apple cake.

On Tuesday, March 25, 2014 1:20:36 PM UTC-7, Cydrome Leader wrote:
jon_banquer wrote:

On Tuesday, March 25, 2014 10:41:54 AM UTC-7, Cydrome Leader wrote:

jon_banquer wrote:



On Tuesday, March 25, 2014 10:05:09 AM UTC-7, Cydrome Leader wrote:



jon_banquer wrote:







On Monday, March 24, 2014 12:47:31 PM UTC-7, Cydrome Leader wrote:







I keep running into an issue with spiral reamers that leave what appears















to be rifling in anything (aluminum) that I ream.































changing speed and feed rates doesn't seem to matter. Dry or with cutting















oil doesn't seem to matter either.































The straight reamers of the same size don't seem to have this problem.































What might be causing this, or how does one stop it?























Sounds like chip build up on the reamer.















Is it a through hole?















it's through hole. chip build up doesn't seem to be a problem. The rifling







starts immediately.















Can you stop the reamer and clean it when it pokes through?















yeah, it doesn't appear to be the cause. It will happen at any depth, be







it 1/4 or an 1".















Usually spiral reamers leave a better finish.















not this one at least.











What are you holding the spiral reamer with?







3 jaw chuck in a tailstock.



Check the alinement of the tailstock. I think something is off. You can start by doing something like this:



http://www.youtube.com/watch?v=AtYi-mXS4O0



will have to try that rule trick.



shop dog has some great recipies by the way- I tried the apple cake.


It's a great quick check and it is especially helpful in a machining job shop that has its share of hacks where you share equipment.

For cooking I'll stick with Alton Brown. Trying hard not to become a fanboi but it's hard because I think he's so much better than the rest.

"jon_banquer" wrote in message
...
On Tuesday, March 25, 2014 1:20:36 PM UTC-7, Cydrome Leader wrote:
jon_banquer wrote:

On Tuesday, March 25, 2014 10:41:54 AM UTC-7, Cydrome Leader wrote:

jon_banquer wrote:



On Tuesday, March 25, 2014 10:05:09 AM UTC-7, Cydrome Leader wrote:



jon_banquer wrote:







On Monday, March 24, 2014 12:47:31 PM UTC-7, Cydrome Leader
wrote:







I keep running into an issue with spiral reamers that leave what
appears















to be rifling in anything (aluminum) that I ream.































changing speed and feed rates doesn't seem to matter. Dry or
with cutting















oil doesn't seem to matter either.































The straight reamers of the same size don't seem to have this
problem.































What might be causing this, or how does one stop it?























Sounds like chip build up on the reamer.















Is it a through hole?















it's through hole. chip build up doesn't seem to be a problem. The
rifling







starts immediately.















Can you stop the reamer and clean it when it pokes through?















yeah, it doesn't appear to be the cause. It will happen at any
depth, be







it 1/4 or an 1".















Usually spiral reamers leave a better finish.















not this one at least.











What are you holding the spiral reamer with?







3 jaw chuck in a tailstock.



Check the alinement of the tailstock. I think something is off. You can
start by doing something like this:



http://www.youtube.com/watch?v=AtYi-mXS4O0



will have to try that rule trick.



shop dog has some great recipies by the way- I tried the apple cake.


It's a great quick check and it is especially helpful in a machining job
shop that has its share of hacks where you share equipment.

I prefer using an indicator in the spindle, attached to a medium lengt rod
so that it can be repositioned, lock the tailpiece and indicate the tail
center at both the retracted and extended positions. This not only centers
the quill but it also tells you whether the quill travel is parallel to the
spindle bearing rotational axis (if it is not parallel then a drill might
line up perfeftly but a reamer will be off-center because a reamer is
typically longer than a drill)

Usually though I just chamfer a bit larger than the reamer and then single
point bore a bit smaller than the reamer for a shallow distance, which
eliminates the problem of reamer wobble on entry....generally works fine
except in exceptionally soft materials since tailstiocks and reamers tend to
flex fairly easily and so they'll tend to follow the hole if you at least
given them a fighting chance.

For cooking I'll stick with Alton Brown. Trying hard not to become a
fanboi but it's hard because I think he's so much better than the rest.

Cydrome Leader wrote:
jon_banquer wrote:
On Tuesday, March 25, 2014 10:41:54 AM UTC-7, Cydrome Leader wrote:
jon_banquer wrote:

On Tuesday, March 25, 2014 10:05:09 AM UTC-7, Cydrome Leader wrote:

jon_banquer wrote:



On Monday, March 24, 2014 12:47:31 PM UTC-7, Cydrome Leader wrote:



I keep running into an issue with spiral reamers that leave what appears







to be rifling in anything (aluminum) that I ream.















changing speed and feed rates doesn't seem to matter. Dry or with cutting







oil doesn't seem to matter either.















The straight reamers of the same size don't seem to have this problem.















What might be causing this, or how does one stop it?











Sounds like chip build up on the reamer.







Is it a through hole?







it's through hole. chip build up doesn't seem to be a problem. The rifling



starts immediately.







Can you stop the reamer and clean it when it pokes through?







yeah, it doesn't appear to be the cause. It will happen at any depth, be



it 1/4 or an 1".







Usually spiral reamers leave a better finish.







not this one at least.





What are you holding the spiral reamer with?



3 jaw chuck in a tailstock.

Check the alinement of the tailstock. I think something is off. You can start by doing something like this:

http://www.youtube.com/watch?v=AtYi-mXS4O0

will have to try that rule trick.

Well, it turns out there is an alignment issue. The tailstock/spindle are
at slightly different heights. Not sure how or when this happened. I'll
have to figure this out and then try and see what happens.

On Wednesday, March 26, 2014 9:05:42 AM UTC-7, PrecisionmachinisT wrote:
"jon_banquer" wrote in message

...

On Tuesday, March 25, 2014 1:20:36 PM UTC-7, Cydrome Leader wrote:

jon_banquer wrote:



On Tuesday, March 25, 2014 10:41:54 AM UTC-7, Cydrome Leader wrote:



jon_banquer wrote:







On Tuesday, March 25, 2014 10:05:09 AM UTC-7, Cydrome Leader wrote:







jon_banquer wrote:















On Monday, March 24, 2014 12:47:31 PM UTC-7, Cydrome Leader

wrote:















I keep running into an issue with spiral reamers that leave what

appears































to be rifling in anything (aluminum) that I ream.































































changing speed and feed rates doesn't seem to matter. Dry or

with cutting































oil doesn't seem to matter either.































































The straight reamers of the same size don't seem to have this

problem.































































What might be causing this, or how does one stop it?















































Sounds like chip build up on the reamer.































Is it a through hole?































it's through hole. chip build up doesn't seem to be a problem. The

rifling















starts immediately.































Can you stop the reamer and clean it when it pokes through?































yeah, it doesn't appear to be the cause. It will happen at any

depth, be















it 1/4 or an 1".































Usually spiral reamers leave a better finish.































not this one at least.























What are you holding the spiral reamer with?















3 jaw chuck in a tailstock.







Check the alinement of the tailstock. I think something is off. You can

start by doing something like this:







http://www.youtube.com/watch?v=AtYi-mXS4O0







will have to try that rule trick.







shop dog has some great recipies by the way- I tried the apple cake.





It's a great quick check and it is especially helpful in a machining job

shop that has its share of hacks where you share equipment.



I prefer using an indicator in the spindle, attached to a medium lengt rod

so that it can be repositioned, lock the tailpiece and indicate the tail

center at both the retracted and extended positions. This not only centers

the quill but it also tells you whether the quill travel is parallel to the

spindle bearing rotational axis (if it is not parallel then a drill might

line up perfeftly but a reamer will be off-center because a reamer is

typically longer than a drill)



Usually though I just chamfer a bit larger than the reamer and then single

point bore a bit smaller than the reamer for a shallow distance, which

eliminates the problem of reamer wobble on entry....generally works fine

except in exceptionally soft materials since tailstiocks and reamers tend to

flex fairly easily and so they'll tend to follow the hole if you at least

given them a fighting chance.



For cooking I'll stick with Alton Brown. Trying hard not to become a

fanboi but it's hard because I think he's so much better than the rest.


As per usual, excellent machining advice from Precision Machinist.

On Wednesday, March 26, 2014 9:52:15 AM UTC-7, Cydrome Leader wrote:
Cydrome Leader wrote:

jon_banquer wrote:

On Tuesday, March 25, 2014 10:41:54 AM UTC-7, Cydrome Leader wrote:

jon_banquer wrote:



On Tuesday, March 25, 2014 10:05:09 AM UTC-7, Cydrome Leader wrote:



jon_banquer wrote:







On Monday, March 24, 2014 12:47:31 PM UTC-7, Cydrome Leader wrote:







I keep running into an issue with spiral reamers that leave what appears















to be rifling in anything (aluminum) that I ream.































changing speed and feed rates doesn't seem to matter. Dry or with cutting















oil doesn't seem to matter either.































The straight reamers of the same size don't seem to have this problem.































What might be causing this, or how does one stop it?























Sounds like chip build up on the reamer.















Is it a through hole?















it's through hole. chip build up doesn't seem to be a problem. The rifling







starts immediately.















Can you stop the reamer and clean it when it pokes through?















yeah, it doesn't appear to be the cause. It will happen at any depth, be







it 1/4 or an 1".















Usually spiral reamers leave a better finish.















not this one at least.











What are you holding the spiral reamer with?







3 jaw chuck in a tailstock.



Check the alinement of the tailstock. I think something is off. You can start by doing something like this:



http://www.youtube.com/watch?v=AtYi-mXS4O0



will have to try that rule trick.



Well, it turns out there is an alignment issue. The tailstock/spindle are

at slightly different heights. Not sure how or when this happened. I'll

have to figure this out and then try and see what happens.


Glad you got it figured out. I had no doubt you would. I also have no doubt you will become an excellent machinist.