What Is This?

[rex21]

Not a single marking on it. The serrations actually appear to be saw teeth on closer inspection.

 

[jim18655]

On a hunch I searched for armature trimming tools and found something similar in an old booklet "How to True Armatures, Bulletin 2A" by the South Bend Lathe Works . I think parts are missing but it might be for undercutting the mica in armatures. The square block mounts it to a holder and the handle moves the cutting blades.

 

[kd4gij]

I think we have a winner, Jim.
search. vintage mica under cutter tool

 

[rex21]

Good call Jim. One of the first pics that pop up looks identical! Thank you!

Thank you for the responses guys. I think the guessing game is over.

 

[Bill C.]

On a hunch I searched for armature trimming tools and found something similar in an old booklet "How to True Armatures, Bulletin 2A" by the South Bend Lathe Works . I think parts are missing but it might be for undercutting the mica in armatures. The square block mounts it to a holder and the handle moves the cutting blades.

My Dad would know how to use it. I think one would remove the wiring and then use this tool to clean out the grooves before rewiring. Those old South Bend books have many examples how to use their lathes.

 

[catskinner]

armature trimming tools

Thanks for the information I am now the proud owner of an armature trimming tool. It will be displayed in my vintage tool collection, in my vintage machinists chest.
Thank you rex21 for putting it in the Pass Around box.

 

[rex21]

I'm glad someone is proud to own it! I was hoping someone such as yourself would appreciate getting it.