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A common problem is that the bushings in the pulley get worn when run without putting oil in the oil hole buried in the bottom of one of the pulley grooves. Jon

I was figuring that was probably the problem. It's been most of 50 years since I last played with the stuff. Been buying silicon carbide as much as possible since the 80's. Polished the commutators

If you look at the various abrasives under a microscope (electron) you can determine the shape. Silicon carbide is sharp for instance.? Rouge is almost round at least is when milled, about 250

My recollection is that emery grit is conductive and you don't want any missed particles shorting out commutator segments.? Just my memory from working on old DC motors, wind turbines, and electric

Since we’re on this subject, my back gear slips out under load. What do I adjust to keep the over-center lever in? Thanks. Jim

Check for missing shims on the back gear mounting bolts to the headstock. Atlas has .002 & .003 in parts book.

Why not a strip of wet or dry sand paper it doesn't shed as much abrasive as the open coat rolls. Ive used it on armatures for 54 years. Dusty

I have 101.07301 Atlas / Craftsman lathe from the early 1940's.? I was using the back gear and noticed a rattle.? I'm uncertain which part of the back gear the noise is coming from.? Is anyone

Folks have been usin Crocus Cloth for polishing crank shafts & such for many many years . That's why I bought it a long time back . animal

Crocus cloth is like really fine sand paper. Like 3000 grit. As Mike said, it's jeweler's rouge, or very finely divided iron oxide with a bit of a carrier, likely grease or wax. Or you can get sticks

I use Crocus Cloth when I want to polish but not remove material.??An old mechanic I worked with polished hydraulic valve spools with it and claimed it didn't remove any material.? Not sure that's

Yea I wouldn't use it on a armature either . Handy thing to have a roll of if yer building / rebuilding a engine . According to Ehow they say it's s like sand paper , I wouldn't go near a crankshaft

Crocus cloth has jewelers rouge impregnated in it. I wouldn’t use it. I’ve had good success with a fresh pink pearl eraser. It removes the carbon pretty good.

Like Crocus Cloth , I haven 't seen that in years . Fixed plenty of crankshafts with Crocus Cloth animal

Emery, the rock, is aluminum oxide, and several kinds of iron oxides, plus other odds and ends. . Just looked it up. Corundum is the major ingredient, which is aluminum

On 09/05/2023 12:04 PM CDT Bill in OKC too via groups.io <wmrmeyers@...> wrote: Emery is not the same at all!! A lot of people say they take some “emery” to it! Aluminum oxide and

The commutator should have an even chocolate-brown color with no nicks, gouges, high spots, etc.

Thanks Jeff! First photo, last two digits 82 is the motor we've been talking about mostly. #83 is the other motor. They don't look too bad to me. ;) I'm also having a wiring or relay problem... I can

Bill, Commutators once were made differently. Most in the last 25 years or more are injection molded, and have sub-flush mica. This was so that they didn't need to be under-cut when manufactured. They