Question on old motor construction

[dngrmse]

Hey guys, I started to take apart the grinder I picked up about a week ago, I thought my plan was going to be simple. Disassemble it, send out to have the parts powder coated, go over the wiring, and re-assemble. So as far as I can tell it has two coats of paint or maybe just one. The top layer is a machine gray paint, and the layer underneath is black- but her'es my question. I started disassembling one of the end housings, and it seems the black layer may be some kind of filler, kind of like bondo. It's hard, but with a screwdriver it can be scraped off with a little effort. Is anyone familiar with this? Was it some sort of filler used yo cover the imperfections in the casting? It's acting as a sort of JBweld due to the way its been applied to the joint where the end housings meet the main housing. Anyone have any suggestions as to the best way to remove it? Or just continue to scrape it off? Thanks.

 

[A_Pmech]

Likely casting filler.

You can scrape it off, wire wheel it down and apply polyester body filler to fill the casting.

 

[dngrmse]

Thanks, that must be it. I'll try the wire wheel tomorrow. I'll have to rethink my plan though, I doubt the powder coating shop will got through the trouble of reapplying the filler after they sand blast it.

 

[jakemac]

Some shops will do the bodywork, but it will cost you extra based on time involved.

 

[dngrmse]

Well, I got the end housings off. Turns out I was looking for the seam in the wrong place. Had to run to HF to pick up a Pin Spanner. In order to take them off, I had to remove some end retainers that were holding the shaft in place.

No burn marks on the motor, but there is quite a bit of dust in there. Now what to do with the wiring? I had wanted to replace the wires coming from the windings with some that will be less likely to crack, but I also read it may be best to leave them alone. Although one tip I saw on youtube said to paint them with that liquid electrical tape stuff which sounds like a good idea.

 

[Roberts210]

Don't use the liquid elec tape. Get a bottle of Glyptal Insulating Varnish. They make it in red and clear. I like the red, and have used it a lot on the internal leads, and windings too, on old motors.

 

[dngrmse]

Thanks for the tip, I'll definitely look into that insulating varnish.