And I have adequately repaired many auto generators by manually filing the armature "round" and undercutting the mica with a broken piece of fine-tooth hacksaw.? The "poor boy" method...
-Guy-?
On June 23, 2023 at 11:53 PM Charles Kinzer <ckinzer@...> wrote:
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Here is an armature lathe designed for use in a typical auto repair shop back in the day.? Another aspect is the need to undercut the mica insulators and that is the little attachment in back in the area of the commutator.? This is a photo from an eBay listing that is handy because it has an armature from a generator mounted AND shows how the rotation is powered by a belt directly around the armature.
You could certainly use a Unimat to turn a commutator but might have to raise the head and tail stocks even higher than what is possible with the stock riser blocks.? And you would have to rig up some means to do the mica undercutting.
Charles E. "Chuck" Kinzer
On Friday, June 23, 2023 at 08:02:45 PM PDT, Keith S. Angus <keithsangus@...> wrote:
You sometimes see a rotating chuck for use in the tailstock - they were intended to support the end of a dynamo (or motor) when skimming the commutator. I dimly recall diamond tipped tools being used for this. Wish I'd grabbed a few back when I worked with contact lenses, turned up with diamond tools on spherical turning lathes.
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