I started looking at DC motors. Here's what I needed - a motor with a 1/2" shaft, 1/3 Horsepower, and (preference here) direct current with variability in RPM. I finally gave up and decided to crack the original motor, trying to locate the start capacitor in case I could track a new one down. Don't get me wrong, there are motors out there, but they were all priced in the $300-$800 - and I wasn't plopping that kind of cash into the Ebay ecosystem.
Model: | Dunlap (Sears) model 15.4624 |
Volts: | 110 |
Speed: | 1750 RPM |
Horsepower: | 1/3 |
Amps: | 6 |
Shaft Size: | 0.5" (or 1/2") |
So, I cracked it open.
I noticed a few things :
- It had a switch (yeah, I didn't see that before because it was on the back side of the motor).
- I moved on and found where the wiring went into the casing had worn out, and the wires (made of aluminum) had been exposed to the metal casing - that would be an additional cause of the arcing and sparking.
- It was DIRTY! I grabbed the air compressor nozzle and cleaned it out quickly, but made a nice mess of the back patio in short order.
I found that there wasn't a start capacitor in this motor. It is actually a mechanical assembly.
I also realized that there were oiling channels for the motor bearings, on each end of the case. Thinking they were plugged with old saw dust, I grabbed the air nozzle again and tried to blow them out. Turns out they weren't plugged, but it's some sort of a sponge in there to keep the oil so it would channel into the bushings/brearings. There are grooves on the inside of the casing angled in such a way to put oils around the bearings. Quite ingenious, if you ask me.
After soldering a replacement power cord into place (and fixing a few other things while I was at it in the electrical system), I buttoned it all back up, and plugged it in... success! Proud to have a working original motor connected to the lathe still, costing $15 of repair (for the replacement power cord, which had gouges in it exposing the aluminum wire and making it a bit dangerous). I get my man card back again.
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