dcsimg

Working on restoring an old Craftsman Block Grinder. Hit a snag…

This topic contains 6 replies, has 7 voices, and was last updated by  theamcguy 2 years, 9 months ago.

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  • #538088

    Dustincoc
    Pro
    Madrid, NY

    Model 397.19590, build date of Sept. 20, 2965, by Delco, a division of General Motors.

    Before

    partially done

    I had to replace the capacitor as it was leaking and during disassembly both connector tabs snapped off. Before I tore it down it worked but I had to spin the wheels to get it going, otherwise the motor just hummed(a normal indicator of capacitor problems).

    Today I got the basic grinder, sans guards and rest put together. When I first put the motor together, I fired it up to test my wiring and it seemed to work. I installed the new capacitor and replaced a baby blue wire leading from the power switch to the windings as it had gotten pinched and the insulation was badly damaged. Used a 14ga piece of the same color wire that appears to be the same size internally as what came out, I couldn’t find markings on the original wire to verify size. I soldered the wire to the windings and connected a spade plug to the switch end.

    Once I got it assembled with wheels on, I tried starting it and it had the same problem as before. When first turned on, the wheels creep backwards a little. Once you spin then up to sufficient speed the motor starts to spin them up to speed.

    After that I pulled the bottom cover of and verified all the wires were properly connected, which they were according to the wiring diagram on the bottom cover. I also noticed that the motor itself was pretty warm when I had the cover off. I’m wondering it I’ve got a bad connection on one end or the other of the baby blue wire or if I need to be looking elsewhere?

    Shop Blog: http://ravenbarsrepair.tumblr.com/
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    #538158

    DirtyWhiteBoy
    Pro
    Honolulu,, Hi.

    The grinder looking good. Looks like there’s a lot of work there.

    Dirty

    A Working Pro since 1988!

    Member since January 26, 2013.

    #538243

    RonW
    Pro
    Holladay, Tn

    Nice job on the restoration. I wonder if you got the wrong capacitor?

    Ron

    A Working Pro since 1994!

    Member since March 26, 2014.

    #538262

    Sprokitz
    Pro
    Eastern shore of, Pa

    It does sound like the capacitor. Nice job on the resto

    #538266

    jponto07
    Moderator
    Bloomington, IN

    Sounds like the capacitor to me as well. They help with start up speed. Perhaps the one you bought is bad?

    Jon P.
    Timber Carpentry & Construction
    https://www.facebook.com/timbercarpentry/
    Instagram

    #538270

    crotalusco
    Pro
    west bend, wi

    I know nothing about how tools work so i will be of no help. But i will follow this as I have an OLD home built drill press I would like to get running again. Looking great so far

    #538333

    theamcguy
    Pro
    Fayetteville, NC

    Nice old grinder Dustin. Came out looking really good.

    Automotive Pro
    Fayetteville, NC

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