Older table saw motor stalling

[bradleyheathhays]

Just got this 30 year old Craftsman table saw for free because the motor's not spinning, 1HP 110v. Before sourcing another I'm curious if I can get this one working again. When you hit the power the motor makes a decent hum and sounds like it's trying to go. Also there's an quick intermittent screeching that I'm guessing is a bad bearing. If you take the belt off and spin the pulley it gets up to speed fairly quickly making no unusual sounds or vibration. The notched arbor protrudes from the opposite side as well and I get the idea I could kick start it with a drill if I could hack together some kind of adapter.

If I can do say a $20 dollar repair I'd rather do that as opposed to $80+ for a replacement. Any idea what's gone wrong with this poor old motor?

 

[Ttrees]

If it's got an induction motor and not a universal brushed motor,
then it sounds like the capacitor needs replacement.
They can be bought for a fiver, just make sure the values are the same, and that it fits dimension wise, if there is a box for it to fit into.

Bearings are cheap also, seems like you could get the machine sorted for around twenty squid.
Good luck
Tom

 

[bradleyheathhays]

That's for the advice Tom. Turns out it's definitely my capacitor. I've been doing some internet searching using the numbers on the side of the cap but I still don't trust myself to find the right replacement. The word MALLORY is written above 'made in the usa.' What numbers should I be paying attention to?

 

[Ttrees]

I'm not too knowledgeable about them TBH
What I can tell, your looking for a "motor start capacitor"
216-259 microfarad/ MF/ μF symbol.

Seems some caps don't mind if it's 50hz or 60hz, (Hertz) or "cycles" per second,
but seems yours is stated for across the drink only? , as its 60hz.
And it's stated for 110v.

Does it need to fit into something?
I don't know what the rest of the figures are, but I'd take a guess that some of it refers to the size of it dimension wise.

I'd try and do a google or ebay search typing in....
start capacitor 216-259 mfd 110vac

Hopefully someone will be along to tell me what the rest means, and if I'm leaving something important out.

Sorry I can't be much help
Tom

 

[bradleyheathhays]

Well, lesson learned is if it walks like a bad capacitor and talks like a bad capacitor, it very well could be a bad centrifugal start switch...and that's what it turned out to be. After getting the new cap in it did the same growl no start and after getting it all apart and cleaning the switch it starts like a dream. Well almost, I have a replacement bearing on the way but after that this 30+ year old motor should run like new. Thanks for all the direction guys.