Re: Feed rate increase and crazy thread milling, just for fun

#102091

开云体育

Did you see the red marks on one of the sprockets? For a 8 start internal thread with specific start and end orientation.

More thread milling! Used to do all that in the lathe, that's a whole different story. Especially when you add ovality to compensate for shrinkage.

Dave

Show quoted text

On January 12, 2019 at 4:24 PM mike allen <animal@...> wrote:

??? ??? shouldn't you be out making parts for the space shuttle or something?
On 1/12/2019 2:06 PM, Guenther Paul wrote:
Bill
The pictures explain the prosses

GP

--------------------------------------------
On Sat, 1/12/19, Bill in OKC too via Groups.Io <wmrmeyers@...> wrote:

Subject: Re: [atlas-craftsman IO] Feed rate increase and crazy thread milling, just for fun
To: [email protected]
Date: Saturday, January 12, 2019, 5:00 PM

I would be interested in hearing more about
what you did, and how you went about doing it. I? hope some
day to be skilled enough to make a rifling machine, and it
looks like what you've done here could be helpful to
know.

Bill in OKC

On Saturday, January 12, 2019, 3:55:28
PM CST, Dave Matticks <dpm100@...> wrote:

Hope I can find
the pics of part of my never ending project from a few years
ago.
Needed to cut 1" pitch on a
4" diameter part 24" long. Here's the kicker,
2" root diameter. Don't remember the angle or
radius at the root but you get a sense of the process.
Single point was NG, milling was the only
option. 2 pcs. 303 SS and 2 pcs. Delrin. 1 each left hand
and right hand.
Not regular screw threads.
Feed screws for pleated filter media to glue the ribbons
on.
I love a little challenge once in
awhile.
Dave

?

Re: Feed rate increase and crazy thread milling, just for fun

#102090

开云体育

Probably not, this is caveman technology! I do like it though.

Maybe here's a pic or 2 of the application.

Dave Matticks

Show quoted text

On January 12, 2019 at 4:24 PM mike allen <animal@...> wrote:

??? ??? shouldn't you be out making parts for the space shuttle or something?
On 1/12/2019 2:06 PM, Guenther Paul wrote:
Bill
The pictures explain the prosses

GP

--------------------------------------------
On Sat, 1/12/19, Bill in OKC too via Groups.Io <wmrmeyers@...> wrote:

Subject: Re: [atlas-craftsman IO] Feed rate increase and crazy thread milling, just for fun
To: [email protected]
Date: Saturday, January 12, 2019, 5:00 PM

I would be interested in hearing more about
what you did, and how you went about doing it. I? hope some
day to be skilled enough to make a rifling machine, and it
looks like what you've done here could be helpful to
know.

Bill in OKC

On Saturday, January 12, 2019, 3:55:28
PM CST, Dave Matticks <dpm100@...> wrote:

Hope I can find
the pics of part of my never ending project from a few years
ago.
Needed to cut 1" pitch on a
4" diameter part 24" long. Here's the kicker,
2" root diameter. Don't remember the angle or
radius at the root but you get a sense of the process.
Single point was NG, milling was the only
option. 2 pcs. 303 SS and 2 pcs. Delrin. 1 each left hand
and right hand.
Not regular screw threads.
Feed screws for pleated filter media to glue the ribbons
on.
I love a little challenge once in
awhile.
Dave

?

Re: Feed rate increase and crazy thread milling, just for fun

#102089

开云体育

??? ??? shouldn't you be out making parts for the space shuttle or something?

On 1/12/2019 2:06 PM, Guenther Paul wrote:

Show quoted text

Bill
The pictures explain the prosses

GP

--------------------------------------------
On Sat, 1/12/19, Bill in OKC too via Groups.Io <wmrmeyers@...> wrote:

Subject: Re: [atlas-craftsman IO] Feed rate increase and crazy thread milling, just for fun
To: [email protected]
Date: Saturday, January 12, 2019, 5:00 PM

I would be interested in hearing more about
what you did, and how you went about doing it. I? hope some
day to be skilled enough to make a rifling machine, and it
looks like what you've done here could be helpful to
know.

Bill in OKC

On Saturday, January 12, 2019, 3:55:28
PM CST, Dave Matticks <dpm100@...> wrote:

Hope I can find
the pics of part of my never ending project from a few years
ago.
Needed to cut 1" pitch on a
4" diameter part 24" long. Here's the kicker,
2" root diameter. Don't remember the angle or
radius at the root but you get a sense of the process.
Single point was NG, milling was the only
option. 2 pcs. 303 SS and 2 pcs. Delrin. 1 each left hand
and right hand.
Not regular screw threads.
Feed screws for pleated filter media to glue the ribbons
on.
I love a little challenge once in
awhile.
Dave

Re: Feed rate increase and crazy thread milling, just for fun

#102088

开云体育

I know it's not Craftsman or Atlas but a little food for thought.

You can really do a lot with a little if necessary.

Note the gear motor coupled to the drive motor and chain drive with compound sprockets along with the milling attachment.?

A big CNC lathe with live tooling would have eaten this right up but... I only needed 2 each.

Dave

Show quoted text

On January 12, 2019 at 3:49 PM Dave Matticks <dpm100@...> wrote:

Hope I can find the pics of part of my never ending project from a few years ago.
Needed to cut 1" pitch on a 4" diameter part 24" long. Here's the kicker, 2" root diameter. Don't remember the angle or radius at the root but you get a sense of the process.
Single point was NG, milling was the only option. 2 pcs. 303 SS and 2 pcs. Delrin. 1 each left hand and right hand.
Not regular screw threads. Feed screws for pleated filter media to glue the ribbons on.
I love a little challenge once in awhile.
Dave

Re: Feed rate increase and crazy thread milling, just for fun

#102087

Bill
The pictures explain the prosses

GP

--------------------------------------------

Show quoted text

On Sat, 1/12/19, Bill in OKC too via Groups.Io <wmrmeyers@...> wrote:

Subject: Re: [atlas-craftsman IO] Feed rate increase and crazy thread milling, just for fun
To: [email protected]
Date: Saturday, January 12, 2019, 5:00 PM

I would be interested in hearing more about
what you did, and how you went about doing it. I? hope some
day to be skilled enough to make a rifling machine, and it
looks like what you've done here could be helpful to
know.

Bill in OKC

On Saturday, January 12, 2019, 3:55:28
PM CST, Dave Matticks <dpm100@...> wrote:

Hope I can find
the pics of part of my never ending project from a few years
ago.
Needed to cut 1" pitch on a
4" diameter part 24" long. Here's the kicker,
2" root diameter. Don't remember the angle or
radius at the root but you get a sense of the process.
Single point was NG, milling was the only
option. 2 pcs. 303 SS and 2 pcs. Delrin. 1 each left hand
and right hand.
Not regular screw threads.
Feed screws for pleated filter media to glue the ribbons
on.
I love a little challenge once in
awhile.
Dave

Re: Feed rate increase and crazy thread milling, just for fun

#102086

I would be interested in hearing more about what you did, and how you went about doing it. I? hope some day to be skilled enough to make a rifling machine, and it looks like what you've done here could be helpful to know.

Bill in OKC

On Saturday, January 12, 2019, 3:55:28 PM CST, Dave Matticks <dpm100@...> wrote:

Hope I can find the pics of part of my never ending project from a few years ago.
Needed to cut 1" pitch on a 4" diameter part 24" long. Here's the kicker, 2" root diameter. Don't remember the angle or radius at the root but you get a sense of the process.
Single point was NG, milling was the only option. 2 pcs. 303 SS and 2 pcs. Delrin. 1 each left hand and right hand.
Not regular screw threads. Feed screws for pleated filter media to glue the ribbons on.
I love a little challenge once in awhile.
Dave

Feed rate increase and crazy thread milling, just for fun

#102085

Hope I can find the pics of part of my never ending project from a few years ago.
Needed to cut 1" pitch on a 4" diameter part 24" long. Here's the kicker, 2" root diameter. Don't remember the angle or radius at the root but you get a sense of the process.
Single point was NG, milling was the only option. 2 pcs. 303 SS and 2 pcs. Delrin. 1 each left hand and right hand.
Not regular screw threads. Feed screws for pleated filter media to glue the ribbons on.
I love a little challenge once in awhile.
Dave

Re: 10" tailstock on a 12" Craftsman lathe?

#102084

开云体育

No, complete tail stock

Sent via the Samsung Galaxy S7, an AT&T 4G LTE smartphone

Show quoted text

-------- Original message --------

From: Guenther Paul <paulguenter@...>

Date: 1/11/19 8:09 PM (GMT-05:00)

To: [email protected]

Subject: Re: [atlas-craftsman IO] 10" tailstock on a 12" Craftsman lathe?

Does the turret mount in the tail stock quill

GP

--------------------------------------------
On Fri, 1/11/19, ksierens <ksierens@...> wrote:

Subject: Re: [atlas-craftsman IO] 10" tailstock on a 12" Craftsman lathe?
To: "[email protected]" <[email protected]>
Date: Friday, January 11, 2019, 7:53 PM

#yiv4637689772 #yiv4637689772 --
p
{margin-top:0;margin-bottom:0;}
#yiv4637689772

Thanks, there is a 10" turret tail stock there,
just wondered if it would work on my 12" as is.

Sent via the Samsung Galaxy S7, an AT&T 4G
LTE smartphone

-------- Original message --------
From: Andrei <calciu1@...>
Date: 1/11/19 6:46 PM (GMT-05:00)
To: [email protected]
Subject: Re: [atlas-craftsman IO] 10" tailstock on
a 12" Craftsman lathe?

It will not be vertically aligned with the
spindle center. You might be able to machine something to
add to the base and raise it up, or just buy the right
tailstock. Lots of them come up on eBay.

From:
[email protected] <[email protected]>
on behalf of ksierens <ksierens@...>

Sent: Friday, January 11, 2019 6:44 PM

To: [email protected]

Subject: [atlas-craftsman IO] 10" tailstock on a
12" Craftsman lathe?
?

Will a 10" Atlas / Craftsman tailstock fit on a
12" tailstock base? Is the only difference the
thickness of the base?

Re: 10" tailstock on a 12" Craftsman lathe?

#102083

开云体育

Interesting! Never saw or looked for one.

I have an old Enco tailstock turret with a mt2 shank, goes in the tailstock quill.?

Never going to use it but it's here.

Dave?

Sent from my T-Mobile 4G LTE Device

Show quoted text

开云体育

-------- Original message --------

From: "Robert Downs via Groups.Io" <wa5cab@...>

Date: 1/11/19 19:59 (GMT-06:00)

To: [email protected]

Subject: Re: [atlas-craftsman IO] 10" tailstock on a 12" Craftsman lathe?

Atlas made three types of tailstocks for the 10” and 12” lathes.? The standard tailstocks (the ones that came with the lathes) are not interchangeable.? The 12” ones (early and late) are 1.000” taller than the 10” one.? But the 10” and early 12” ones use the same 10D-6 Base.?

?

The other two types are the lever action tailstock and the tailstock turret.? The same one was used on both 10” and early and late 12”.? When installed on a 10” lathe, the base used is the same 10D-6 used under the standard tailstock.? When sold to go onto a 12”, the base used was the L6-6A, which is similar to the 10D-6 but is 2.000” tall where the 10D-6 is 1.000”.? I have the factory drawing on the latter one, although it doesn’t appear that I ever put it into Files.? Let me know if anyone needs it.

?

I have had a search running on eBay for at least 5 years without ever turning one up.? I do have one of them that I found on a turret.?

?

Anyway, the short answer to your question is “no” as previously stated.? The tailstock is correct but you will need a taller base, or a 1.000” riser block.? However, “Lots of them” do NOT come up on eBay.

?

Robert Downs

?

From: [email protected] [mailto:[email protected]] On Behalf Of ksierens
Sent: Friday, January 11, 2019 18:53
To: [email protected]
Subject: Re: [atlas-craftsman IO] 10" tailstock on a 12" Craftsman lathe?

?

Thanks, there is a 10" turret tail stock there, just wondered if it would work on my 12" as is.

?

Sent via the Samsung Galaxy S7, an AT&T 4G LTE smartphone

?

-------- Original message --------

From: Andrei <calciu1@...>

Date: 1/11/19 6:46 PM (GMT-05:00)

To: [email protected]

Subject: Re: [atlas-craftsman IO] 10" tailstock on a 12" Craftsman lathe?

?

It will not be vertically aligned with the spindle center. You might be able to machine something to add to the base and raise it up, or just buy the right tailstock. Lots of them come up on eBay.

From: [email protected] <[email protected]> on behalf of ksierens <ksierens@msncom>
Sent: Friday, January 11, 2019 6:44 PM
To: [email protected]
Subject: [atlas-craftsman IO] 10" tailstock on a 12" Craftsman lathe?

?

Will a 10" Atlas / Craftsman tailstock fit on a 12" tailstock base? Is the only difference the thickness of the base?

Re: 10" tailstock on a 12" Craftsman lathe?

#102082

开云体育

No.? The tailstock turret referred to is a stand-alone unit.? It is lever operated and has six adjustable stops.? Also, it takes 3/4” tooling.? The one that has a 2MT arbor and can fit into the tailstock quill ?takes 5/8” tooling.?

?

Robert Downs

?

Show quoted text

From: [email protected] [mailto:[email protected]] On Behalf Of Guenther Paul
Sent: Friday, January 11, 2019 19:09
To: [email protected]
Subject: Re: [atlas-craftsman IO] 10" tailstock on a 12" Craftsman lathe?

?

Does the turret mount in the tail stock quill

GP

--------------------------------------------
On Fri, 1/11/19, ksierens <ksierens@...> wrote:

Subject: Re: [atlas-craftsman IO] 10" tailstock on a 12" Craftsman lathe?
To: "[email protected]" <[email protected]>
Date: Friday, January 11, 2019, 7:53 PM

#yiv4637689772 #yiv4637689772 --
p
{margin-top:0;margin-bottom:0;}
#yiv4637689772

Thanks, there is a 10" turret tail stock there,
just wondered if it would work on my 12" as is.

Sent via the Samsung Galaxy S7, an AT&T 4G
LTE smartphone

-------- Original message --------
From: Andrei <calciu1@...>
Date: 1/11/19 6:46 PM (GMT-05:00)
To: [email protected]
Subject: Re: [atlas-craftsman IO] 10" tailstock on
a 12" Craftsman lathe?

It will not be vertically aligned with the
spindle center. You might be able to machine something to
add to the base and raise it up, or just buy the right
tailstock. Lots of them come up on eBay.

From:
[email protected] <[email protected]>
on behalf of ksierens <ksierens@...>

Sent: Friday, January 11, 2019 6:44 PM

To: [email protected]

Subject: [atlas-craftsman IO] 10" tailstock on a
12" Craftsman lathe?
?

Will a 10" Atlas / Craftsman tailstock fit on a
12" tailstock base? Is the only difference the
thickness of the base?

Re: 10" tailstock on a 12" Craftsman lathe?

#102081

开云体育

Atlas made three types of tailstocks for the 10” and 12” lathes.? The standard tailstocks (the ones that came with the lathes) are not interchangeable.? The 12” ones (early and late) are 1.000” taller than the 10” one.? But the 10” and early 12” ones use the same 10D-6 Base.?

?

The other two types are the lever action tailstock and the tailstock turret.? The same one was used on both 10” and early and late 12”.? When installed on a 10” lathe, the base used is the same 10D-6 used under the standard tailstock.? When sold to go onto a 12”, the base used was the L6-6A, which is similar to the 10D-6 but is 2.000” tall where the 10D-6 is 1.000”.? I have the factory drawing on the latter one, although it doesn’t appear that I ever put it into Files.? Let me know if anyone needs it.

?

I have had a search running on eBay for at least 5 years without ever turning one up.? I do have one of them that I found on a turret.?

?

Anyway, the short answer to your question is “no” as previously stated.? The tailstock is correct but you will need a taller base, or a 1.000” riser block.? However, “Lots of them” do NOT come up on eBay.

?

Robert Downs

?

Show quoted text

From: [email protected] [mailto:[email protected]] On Behalf Of ksierens
Sent: Friday, January 11, 2019 18:53
To: [email protected]
Subject: Re: [atlas-craftsman IO] 10" tailstock on a 12" Craftsman lathe?

?

Thanks, there is a 10" turret tail stock there, just wondered if it would work on my 12" as is.

?

Sent via the Samsung Galaxy S7, an AT&T 4G LTE smartphone

?

-------- Original message --------

From: Andrei <calciu1@...>

Date: 1/11/19 6:46 PM (GMT-05:00)

To: [email protected]

Subject: Re: [atlas-craftsman IO] 10" tailstock on a 12" Craftsman lathe?

?

It will not be vertically aligned with the spindle center. You might be able to machine something to add to the base and raise it up, or just buy the right tailstock. Lots of them come up on eBay.

From: [email protected] <[email protected]> on behalf of ksierens <ksierens@msncom>
Sent: Friday, January 11, 2019 6:44 PM
To: [email protected]
Subject: [atlas-craftsman IO] 10" tailstock on a 12" Craftsman lathe?

?

Will a 10" Atlas / Craftsman tailstock fit on a 12" tailstock base? Is the only difference the thickness of the base?

Re: 10" tailstock on a 12" Craftsman lathe?

#102080

Does the turret mount in the tail stock quill

GP

--------------------------------------------

Show quoted text

On Fri, 1/11/19, ksierens <ksierens@...> wrote:

Subject: Re: [atlas-craftsman IO] 10" tailstock on a 12" Craftsman lathe?
To: "[email protected]" <[email protected]>
Date: Friday, January 11, 2019, 7:53 PM

#yiv4637689772 #yiv4637689772 --
p
{margin-top:0;margin-bottom:0;}
#yiv4637689772

Thanks, there is a 10" turret tail stock there,
just wondered if it would work on my 12" as is.

Sent via the Samsung Galaxy S7, an AT&T 4G
LTE smartphone

-------- Original message --------
From: Andrei <calciu1@...>
Date: 1/11/19 6:46 PM (GMT-05:00)
To: [email protected]
Subject: Re: [atlas-craftsman IO] 10" tailstock on
a 12" Craftsman lathe?

It will not be vertically aligned with the
spindle center. You might be able to machine something to
add to the base and raise it up, or just buy the right
tailstock. Lots of them come up on eBay.

From:
[email protected] <[email protected]>
on behalf of ksierens <ksierens@...>

Sent: Friday, January 11, 2019 6:44 PM

To: [email protected]

Subject: [atlas-craftsman IO] 10" tailstock on a
12" Craftsman lathe?
?

Will a 10" Atlas / Craftsman tailstock fit on a
12" tailstock base? Is the only difference the
thickness of the base?

Re: 10" tailstock on a 12" Craftsman lathe?

#102079

开云体育

Thanks, there is a 10" turret tail stock there, just wondered if it would work on my 12" as is.

Sent via the Samsung Galaxy S7, an AT&T 4G LTE smartphone

Show quoted text

-------- Original message --------

From: Andrei <calciu1@...>

Date: 1/11/19 6:46 PM (GMT-05:00)

To: [email protected]

Subject: Re: [atlas-craftsman IO] 10" tailstock on a 12" Craftsman lathe?

It will not be vertically aligned with the spindle center. You might be able to machine something to add to the base and raise it up, or just buy the right tailstock. Lots of them come up on eBay.

From: [email protected] <[email protected]> on behalf of ksierens <ksierens@...>
Sent: Friday, January 11, 2019 6:44 PM
To: [email protected]
Subject: [atlas-craftsman IO] 10" tailstock on a 12" Craftsman lathe?

?

Will a 10" Atlas / Craftsman tailstock fit on a 12" tailstock base? Is the only difference the thickness of the base?

Re: 10" tailstock on a 12" Craftsman lathe?

#102078

开云体育

It will not be vertically aligned with the spindle center. You might be able to machine something to add to the base and raise it up, or just buy the right tailstock. Lots of them come up on eBay.

Show quoted text

From: [email protected] <[email protected]> on behalf of ksierens <ksierens@...>
Sent: Friday, January 11, 2019 6:44 PM
To: [email protected]
Subject: [atlas-craftsman IO] 10" tailstock on a 12" Craftsman lathe?

?

Will a 10" Atlas / Craftsman tailstock fit on a 12" tailstock base? Is the only difference the thickness of the base?

10" tailstock on a 12" Craftsman lathe?

#102077

Will a 10" Atlas / Craftsman tailstock fit on a 12" tailstock base? Is the only difference the thickness of the base?

Re: Make a Fire Piston

#102076

开云体育

So many good things came frome these thermodynamic principles.? Internal combustion engines, refrigeration, air conditioning, steam turbines for power.

Science is fun

-Jody

Show quoted text

-------- Original message --------
From: "Pete McLaughlin via Groups.Io" <pete_mclaughlin_93555@...>
Date: 1/11/19 11:32 AM (GMT-06:00)
To: [email protected]
Subject: Re: [atlas-craftsman IO] Make a Fire Piston

Hi Bruce

You make a good point that a low heat conductive piston might be better. Here is a video of a copper tube and wood piston type fire piston.

I think the coolest fire piston is clear acrylic where you can see the air glow as the piston reaches the bottom of the stroke.

This makes it clear that:?Gay-Lussac's?law, Amontons'?law?or the?pressure law?was found by Joseph Louis Gay-Lussac in 1809: means raising pressure raises temperature.?

Also this is how diesel engines work and do not need a spark to ignite the oil air mix.

Science is fun

Pete McLaughlin

On Jan 11, 2019, at 4:45 AM, Bruce Freeman <freemab222@...> wrote:

Neat.
Aluminum is highly heat-conductive.? Steel might have been a better choice.? It's denser, but a thinner wall could be used, so it might come out in the wash.
What's really impressive is when someone makes one of these out of natural materials.? I don't have a video, but I recall reading about it somewhere.
Bruce
NJ

On Tue, Jan 8, 2019 at 7:28 AM Pete McLaughlin via Groups.Io <pete_mclaughlin_93555=[email protected]> wrote:
Another fun break from upgrading our lathes.
Here is the metal artist at Clickspring making a fire piston on a lathe.

Enjoy

Pete McLaughlin

Re: Make a Fire Piston

Pete McLaughlin

#102075

开云体育

Hi Bruce

You make a good point that a low heat conductive piston might be better. Here is a video of a copper tube and wood piston type fire piston.

I think the coolest fire piston is clear acrylic where you can see the air glow as the piston reaches the bottom of the stroke.

This makes it clear that:?Gay-Lussac's?law, Amontons'?law?or the?pressure law?was found by Joseph Louis Gay-Lussac in 1809: means raising pressure raises temperature.?

Also this is how diesel engines work and do not need a spark to ignite the oil air mix.

Science is fun

Pete McLaughlin

Show quoted text

On Jan 11, 2019, at 4:45 AM, Bruce Freeman <freemab222@...> wrote:

Neat.
Aluminum is highly heat-conductive.? Steel might have been a better choice.? It's denser, but a thinner wall could be used, so it might come out in the wash.
What's really impressive is when someone makes one of these out of natural materials.? I don't have a video, but I recall reading about it somewhere.
Bruce
NJ

On Tue, Jan 8, 2019 at 7:28 AM Pete McLaughlin via Groups.Io <pete_mclaughlin_93555=[email protected]> wrote:
Another fun break from upgrading our lathes.
Here is the metal artist at Clickspring making a fire piston on a lathe.

Enjoy

Pete McLaughlin

Re: Make a Fire Piston

#102074

Neat.

Aluminum is highly heat-conductive.? Steel might have been a better choice.? It's denser, but a thinner wall could be used, so it might come out in the wash.

What's really impressive is when someone makes one of these out of natural materials.? I don't have a video, but I recall reading about it somewhere.

Bruce
NJ

On Tue, Jan 8, 2019 at 7:28 AM Pete McLaughlin via Groups.Io <pete_mclaughlin_93555=[email protected]> wrote:

Show quoted text

Another fun break from upgrading our lathes.
Here is the metal artist at Clickspring making a fire piston on a lathe.

Enjoy

Pete McLaughlin

Re: Off Topic Question for the old-timers

#102073

I searched "spherical bronze bushing" under Google Images and got a lot of hits.? I didn't follow up on them.

Bruce
NJ

Show quoted text

On Wed, Jan 9, 2019 at 4:04 PM rockindubya via Groups.Io <jeffwoods95=[email protected]> wrote:

Apologies up front for OT, but you guys know more than anyone I've spoken to on the phone today.
Does anyone know the proper terminology for the attached pic? Pillow, Pillow Block, Oval, ovoid, egg, spring, all seem to not be proper.
It's an oil-impregnated sintered bronze bushing that was very common a half century ago in small electric motors. It is a self-centering design, usually held in place by a convex spring, felt washer, and riveted or spot-welded retainer. I have had success in the past just boring out and pressing in new straight bushing stock. I think I had a little too much bite on the chuck and it sprung out oversized once removed.
Yes, I know, i could make one, but that 5/8 OD is a bit out of the range for 1/4 ID stock. This is an on-going issue as I repair small electric motors for classic cars.
I rarely post, but I learn a lot on this forum.
Thanks in advance.
Jeff in Lone Star, TX
(I have no idea how my screen name changed when we switched from Yahoo Groups)

Re: Internal Threading - Compound Setup

#102072

开云体育

Maybe not applicable in this case , but what most machinists I have worked would do is to cut the thread with a single point tool up to 90% or so , and then finish it with the relevant tap or die (often split) which takes care of the flank , root and crest shape issue . . . .

Many ways to skin a cat ,

Keep well,

?

Carvel

?

Show quoted text

From: [email protected] [mailto:[email protected]] On Behalf Of Charles
Sent: 10 January 2019 09:05 PM
To: [email protected]
Subject: Re: [atlas-craftsman IO] Internal Threading - Compound Setup

?

A full profile insert makes the entire thread, flank, root and crest.? Because the root and crest width varies by pitch, they are only good for a limited number of threads.? A partial profile essentially only cuts the flank and root, but you have to finish the crest.? A pass with a file will do it generally, depending on how picky the thread is.? A tool with an 8-48 tpi range is not going to have the proper root width across that whole range, it is only going to be right for the top end of that range (48).? ?From watching youtube, only a limited number of the "machinists"? there bother with root or crest shape, using a sharp v tool for everything.? Whitworth and some other threads have a radius at root and crest.??

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Charles

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On Thursday, January 10, 2019, 12:14:54 PM CST, Jody <jp4lsu@...> wrote:

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In looking for an internal threading boring bar I came across this set on Shars.

It's a UN Internal Threading set.

7 Full profile TIN coated insert Grade P25C coated with 3/8 IC: 1 each of 8, 12, 14, 16, 18, 20, 24 TPI range
3 Partial profile TIN coated insert Grade P25C coated with 3/8 IC: 1 each of A60 (16-48 TPI Range), AG60 (8-48 TPI Range), G60 (8-14 TPI Range)

Is the reason for having the full profile inserts to make the job faster for the lower TPI ranges?
Or because the partial profiles can't make the lower TPI threads deep enough?
Thanks
-Jody