¿ªÔÆÌåÓý

ctrl + shift + ? for shortcuts
© 2025 Groups.io
  1. Fairweatherflyers
  2. Topics

Anyone know what these are?

 

I¡¯ve had these machine tool parts for about 10 years now. I got them from a machinist that went to a nursing home and never got to ask him what they were. They¡¯re marked with common thread sizes but the actual pitch is half of what they are labeled as. All I can think is they¡¯re for a screw cutting operation on a lathe that doesn¡¯t have screw gears? There are no makers marks on the parts or the box other than the latch says Prestolock Co.? They seem to be very well made.?
 

¿ªÔÆÌåÓý

Waylon?


On Apr 20, 2025, at 12:08?PM, Jacob Coby via groups.io <jacob.coby@...> wrote:

I¡¯ve had these machine tool parts for about 10 years now. I got them from a machinist that went to a nursing home and never got to ask him what they were. They¡¯re marked with common thread sizes but the actual pitch is half of what they are labeled as. All I can think is they¡¯re for a screw cutting operation on a lathe that doesn¡¯t have screw gears? There are no makers marks on the parts or the box other than the latch says Prestolock Co.? They seem to be very well made.?

<Image_250420_120627.jpeg>
 

They look like expanding mandrels for holding a part on the ID.
 

Unfortunately they don¡¯t have a way to expand. They also have a drive pin on one end and a center in the end that¡¯s labeled with the thread pitch.?



On Sun, Apr 20, 2025 at 12:40?PM J Jones via <cmmguy=[email protected]> wrote:
They look like expanding mandrels for holding a part on the ID.
 

Also a file skates over them like glass. Probably 60+ Rockwell?

On Sun, Apr 20, 2025 at 12:50?PM Jacob Coby via <jacob.coby=[email protected]> wrote:
Unfortunately they don¡¯t have a way to expand. They also have a drive pin on one end and a center in the end that¡¯s labeled with the thread pitch.?



On Sun, Apr 20, 2025 at 12:40?PM J Jones via <cmmguy=[email protected]> wrote:
They look like expanding mandrels for holding a part on the ID.
 

I'm not sure, I haven't used something like that before


On Sun, Apr 20, 2025 at 12:53 PM, Jacob Coby via groups.io
<jacob.coby@...> wrote:
Also a file skates over them like glass. Probably 60+ Rockwell?

On Sun, Apr 20, 2025 at 12:50?PM Jacob Coby via <jacob.coby=[email protected]> wrote:
Unfortunately they don¡¯t have a way to expand. They also have a drive pin on one end and a center in the end that¡¯s labeled with the thread pitch.?



On Sun, Apr 20, 2025 at 12:40?PM J Jones via <cmmguy=[email protected]> wrote:
They look like expanding mandrels for holding a part on the ID.
 

¿ªÔÆÌåÓý

I¡¯m in a machinist group. I will share your post there.?


On Apr 20, 2025, at 1:02?PM, waylon woodall via groups.io <Doubleu_84@...> wrote:

?I'm not sure, I haven't used something like that before


On Sun, Apr 20, 2025 at 12:53 PM, Jacob Coby via groups.io
<jacob.coby@...> wrote:
Also a file skates over them like glass. Probably 60+ Rockwell?

On Sun, Apr 20, 2025 at 12:50?PM Jacob Coby via <jacob.coby=[email protected]> wrote:
Unfortunately they don¡¯t have a way to expand. They also have a drive pin on one end and a center in the end that¡¯s labeled with the thread pitch.?

<Image_250420_125002.jpeg>
<Image_250420_125027.jpeg>


On Sun, Apr 20, 2025 at 12:40?PM J Jones via <cmmguy=[email protected]> wrote:
They look like expanding mandrels for holding a part on the ID.

<Image_250420_125027.jpeg>
<Image_250420_125002.jpeg>
 

See the slit down the length of that OD?? That certainly looks like an allowance for expansion.
 

Are you looking at the phenolic sleeve? I never thought they were part of the tool but I suppose that¡¯s a possibility. Oddly enough they all have that slit except for the one labeled as -13. I always assumed it was there to make them easier to remove from the sleeve.?

All of the sleeves measure approximately the same. 3/4 necking down to 5/8.?

On Sun, Apr 20, 2025 at 2:13?PM J Jones via <cmmguy=[email protected]> wrote:
See the slit down the length of that OD?? That certainly looks like an allowance for expansion.
 

Thanks. I¡¯d love to find out what they are. Best I can tell they¡¯re a threading guide for something like a production lathe or even something like the Hardinge cataract lathe or some other small precision lathe but I¡¯ve never been able to find anything definitive.?

With about 5¡± of thread at half pitch you¡¯re only going to get maybe 1-2¡± of thread out of one of these things.?

It¡¯s also weird the thread itself is a 60 degree v thread. For something that would drive a lathe I would have expected something more like an acme thread or other prismatic or square thread.?

On Sun, Apr 20, 2025 at 1:57?PM Jerry Tice via <gttice=[email protected]> wrote:
I¡¯m in a machinist group. I will share your post there.?


On Apr 20, 2025, at 1:02?PM, waylon woodall via <Doubleu_84=[email protected]> wrote:

?I'm not sure, I haven't used something like that before


On Sun, Apr 20, 2025 at 12:53 PM, Jacob Coby via
<jacob.coby=[email protected]> wrote:
Also a file skates over them like glass. Probably 60+ Rockwell?

On Sun, Apr 20, 2025 at 12:50?PM Jacob Coby via <jacob.coby=[email protected]> wrote:
Unfortunately they don¡¯t have a way to expand. They also have a drive pin on one end and a center in the end that¡¯s labeled with the thread pitch.?

<Image_250420_125002.jpeg>
<Image_250420_125027.jpeg>


On Sun, Apr 20, 2025 at 12:40?PM J Jones via <cmmguy=[email protected]> wrote:
They look like expanding mandrels for holding a part on the ID.

<Image_250420_125027.jpeg>
<Image_250420_125002.jpeg>
 

They look like a good fit to support an older industry (by a "qualified" technician)...such as printing press production line.

Bet placed: $40 to the museum if I lose.


On Sun, Apr 20, 2025, 3:03 PM Jacob Coby via <jacob.coby=[email protected]> wrote:
Thanks. I¡¯d love to find out what they are. Best I can tell they¡¯re a threading guide for something like a production lathe or even something like the Hardinge cataract lathe or some other small precision lathe but I¡¯ve never been able to find anything definitive.?

With about 5¡± of thread at half pitch you¡¯re only going to get maybe 1-2¡± of thread out of one of these things.?

It¡¯s also weird the thread itself is a 60 degree v thread. For something that would drive a lathe I would have expected something more like an acme thread or other prismatic or square thread.?

On Sun, Apr 20, 2025 at 1:57?PM Jerry Tice via <gttice=[email protected]> wrote:
I¡¯m in a machinist group. I will share your post there.?


On Apr 20, 2025, at 1:02?PM, waylon woodall via <Doubleu_84=[email protected]> wrote:

?I'm not sure, I haven't used something like that before


On Sun, Apr 20, 2025 at 12:53 PM, Jacob Coby via
<jacob.coby=[email protected]> wrote:
Also a file skates over them like glass. Probably 60+ Rockwell?

On Sun, Apr 20, 2025 at 12:50?PM Jacob Coby via <jacob.coby=[email protected]> wrote:
Unfortunately they don¡¯t have a way to expand. They also have a drive pin on one end and a center in the end that¡¯s labeled with the thread pitch.?

<Image_250420_125002.jpeg>
<Image_250420_125027.jpeg>


On Sun, Apr 20, 2025 at 12:40?PM J Jones via <cmmguy=[email protected]> wrote:
They look like expanding mandrels for holding a part on the ID.

<Image_250420_125027.jpeg>
<Image_250420_125002.jpeg>
 

Those are finigan pins that usually fit into a maurader?assembly.

Mark

On Sun, Apr 20, 2025 at 2:57?PM Jacob Coby via <jacob.coby=[email protected]> wrote:
Are you looking at the phenolic sleeve? I never thought they were part of the tool but I suppose that¡¯s a possibility. Oddly enough they all have that slit except for the one labeled as -13. I always assumed it was there to make them easier to remove from the sleeve.?

All of the sleeves measure approximately the same. 3/4 necking down to 5/8.?

On Sun, Apr 20, 2025 at 2:13?PM J Jones via <cmmguy=[email protected]> wrote:
See the slit down the length of that OD?? That certainly looks like an allowance for expansion.

1 - 12 of 12