Help identify this accessorie, Please

[Cr23484]

I found this today in my basement.
Am I correct to assume this is for sharpenng metal lathe tools?
Robert J Clarke company in california made this.
Here are some pics
Thanks in advance for any help
C

 

[4ssss]

That is made to sharpen threading tool bits. I made one when I was in Tech school 50 yrs ago.

 

[benmychree]

Yes, that is what it is, I have one, used with a surface grinder, they will sharpen 60 degree thread tools and 29 degree Acme thread tools.

 

[Cr23484]

That is made to sharpen threading tool bits. I made one when I was in Tech school 50 yrs ago.

Very cool, thank you
This will come in handy for my lathe threading tools
C

 

[Cr23484]

Yes, that is what it is, I have one, used with a surface grinder, they will sharpen 60 degree thread tools and 29 degree Acme thread tools.

Thank you for your quick reply
Very solid weight on this little guy!
C

 

[RJSakowski]

https://patentimages.storage.googleapis.com/e8/e9/f9/252e4bd3f2da48/US2385902.pdf

 

[Cr23484]

Thank You RJ
Alot of info and patent in 1945, 10 years before I was born!
Very cool!

 

[buffdan]

Instructions: https://www.hobby-machinist.com/resources/clark-thread-tool-grinding-fixture.2816/

 

[mmcmdl]

Yep . Threading tool fixture . I also made one as an apprentice .

 

[Cr23484]

Thank you for all your help