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Yes Jon, it is not a good design. I am having problems reinstalling the brushes. Possible the threaded cap got deformed, as I cannot insert the brush tab. [image: IMG_20240709_161647431.jpg] I made

Ralph, In a previous photo you provided, it shows the power wire wrapped loosely(spring touching in multiple tiny points), around the brass part of the brush holder assy. The power has to go through

Ralph, did you check the resistance between the contacts of the commutator. Regarding the health of the contacts, solderings may have not resisted to the heat, they possibly had melted or

It is what motor companies say. There a lot goes to figuring heat transfer. It is only a simple way of figuring out the limits. Dave

Thanks Ralph animal

You can’t add temparures like that. It is not linear. Without going into the science, maybe an easy why to explain it is that the rate that heat moves depends on the difference in temperature. So

Mike, the brush is 7.8mm wide, 4.9mm thick and 15mm long. The problem you see is because the stick I used for alignment was smaller then the actual brush holder. That is why it is off. There probably

Most motor are rated on any machine tool is rated for the rize in temperature. So if shop at 80° and motor rated 120° rize.The motor temperature is 200° Now with today's temperature where I live is

When doing a lot motor repair it hard to get the parts. I even took brushes and file down to fit. I had older motors for parts. Getting parts has always been a problem. FYI Ebay can easier to find

??? What size is the hole in the brush holder ? If ya could get something smaller that the brush hole to keep alignment like in yer pic maybe some JB Weld could make for a real solid repair

Here is the adjusted brush holder: [image: IMG_20240708_190756852.jpg] It's not straight so maybe I'll try to adjust. I'll try to get the wood closer to actual dimensions. You can see what happened

Here's more detail than you probably want about testing ball bearings; < https://www.nsk.com/tools-resources/mantenance/bearing-inspection/ > Realistically, on these small bearings all that's needed

I heated the miss aligned holder up. I got it lined up with the opposite holder but the little knob on top that holds the set screw melted. I do not see how the holder would be replaced. I will put

I wondered if the little machine shop could get you a new holder as it looks like one could pull off the melted holder and just press on a replacement.

The mini lathe will be still around . Before the disastrous the earth temperature was 140°F and the oxygen was above 30%. We had real big bugs We just need to have better AC then for the hobby shop

I should hope not. Not only would we burn ourselves using our lathes in that kind of heat, but our perspiration dripping on the machines would create a lot of rust. Besides, if temperatures on

Here a photo from past. If look under motor you see a opening . The set motor to bring in cool air. The only problem is low speed work. Dave

Yes, You are correct. The best you can expect with forced air cooling is to cool the part to ambient temperature. You can of course, never get there, no matter how big the fan. But again the

40°C is 104°F Try living where the temperature is in normal will 110°F 43.3°C Cooling becomes a big problem Dave

Most of the parts are rated for at least 80C. Parts will work OK even if they are so hot they ould burn your skin. That said service life can depend on temperature. With air cooling, the