All Springer/NP/PCP Air Gun Discussion General > Machine Shop Talk & AG Parts Machining
What's wrong with my lathe motor
sb327:
That cover only covers a fan.
It would be under the end plate of the motor, normally. The plate that houses the bearing.
Dave
sb327:
Check out here https://www.quora.com/What-purpose-does-a-centrifugal-switch-have-on-a-motor
Dave
jackssmirkingrevenge:
I assume this is what I'm looking for:
I'll check it out this evening, thanks for the tip!
KWK:
If it doesn't have start up torque (weak or none) I suspect the start capacitor. The value will be printed on the capacitor. Order one on eBay. They can be had very reasonably. The seller usually gives the capacitor dimensions in the description. You want to be sure it fits. Usually in a can on the side of the motor. I only worked on one split phase motor that had a bad centrifugal switch and it was a pretty old motor that had heavy use. I think a bad capacitor overloaded it. One of the contacts in the switch had fallen out.
I have repaired quite a few vintage capacitor start motors. I like to have period motors on my vintage machines because they look cool and run well. Certain vintage motors also bring good money. I've sold a few. Old Craftsman motors are desirable and run very quiet. They often have bad capacitors.
jackssmirkingrevenge:
--- Quote from: KWK on November 07, 2022, 10:30:47 AM ---I suspect the start capacitor.
--- End quote ---
Looks like that's the issue, I took the motor apart to look at the centrifugal switch and nothing seems to be broken or dirty:
Of the two capacitors however, according to my multimeter the one on the left is faulty, as it's the one with larger capacitance I assume it's the start capacitor.
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