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Tool Talk Discussion Forum

Radial Arm Saw motor again...

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kopeck

06-01-2007 13:45:51




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First off if you click here you can see my first post. No sense reinventing the wheel!

Anyway I just got my new capacitor and installed it and I'm still getting the same results. The first time you use it seem to have good power but when you turn it back on it either spins up a bit and then slowly stops or doesn't turn at all.

I'm not really sure what else to look at? I wouldn't be the stator or the rotor would it?

Thanks,

K

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MarkB_MI

06-01-2007 16:42:46




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 Re: Radial Arm Saw motor again... in reply to kopeck, 06-01-2007 13:45:51  
I think you should have listened to Gerald J., who said it was the centrifugal starting switch.

The giveaway here is that it works the "first time", which I take to mean the first time you use it that day. What's probably happening is the switch isn't closing immediately after the motor stops. But after a few hours, it eventually closes and then you can restart the motor. It may just need a good clean up.

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Gerald J.

06-01-2007 17:42:56




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 Re: Radial Arm Saw motor again... in reply to MarkB_MI, 06-01-2007 16:42:46  
Everything still points to a dirty centrifugal switch. Either the weights or the switch itself. Its old enough. I've had that trouble with all sizes of motors up to 10 HP single phase 1750 RPM. Taking that back end bell off up in top a corn crib was a pain but its worked ever since I cleaned the crud from around the centrifugal starting switch so it could operate properly. And the motor on the radial arm saw gatheres plenty of sawdust.

Gerald J.

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kopeck

06-01-2007 20:19:30




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 Re: Radial Arm Saw motor again... in reply to Gerald J., 06-01-2007 17:42:56  
Would that be the "relay" in the diagram?

I don't see any switch, besides the actual on/off switch.

Thanks,

K



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bil b va

06-01-2007 21:05:29




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 Re: Radial Arm Saw motor again... in reply to kopeck, 06-01-2007 20:19:30  

looks like it uses a voltage or current relay instead of a centrefigual switch . that is probably causing the problem .



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kopeck

06-02-2007 06:13:17




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 Re: Radial Arm Saw motor again... in reply to bil b va, 06-01-2007 21:05:29  
I don't suppose there is any way to test the relay?

So the general consensus is that it's probably on the winding?

K



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Gerald J.

06-02-2007 08:55:02




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 Re: Radial Arm Saw motor again... in reply to kopeck, 06-02-2007 06:13:17  
If the relay doesn't power the start winding when the run winding has power (and should be drawing lots of current making the motor hum) then the relay is bad. The motor should come up to speed with no start winding if you give the shaft a spin before turning on. It has to be turning to get up to speed which it will do slowly.

Gerald J.



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kopeck

06-02-2007 09:03:19




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 Re: Radial Arm Saw motor again... in reply to Gerald J., 06-02-2007 08:55:02  
See that doesn't quiet make sense in the situation. The saw will start some times but only make it up to 1/4 speed then slow down and stop.

Unless the start winding isn't getting it going fast enough for the other winding to take over?

K



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bil b va

06-01-2007 14:25:05




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 Re: Radial Arm Saw motor again... in reply to kopeck, 06-01-2007 13:45:51  
lesson learned.. never buy sears electrical power tools . i have a 10" radial i use a 7 1/4 blade on to crosscut a spruce 2x4 so i won't over power it . problem from day one . sears accused me of using a long under sized extension cord , bull i had it pluged into a 20 amp circuit . my brother went through 3 routers before he gave up



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jml755

06-02-2007 05:11:45




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 Re: Radial Arm Saw motor again... in reply to bil b va , 06-01-2007 14:25:05  
Bill v va:
The guy might be right. The size of the circuit (20A)does not matter if you used an undersized extension cord. It just creates more resistance in the circuit, so the motor can't pull enough amps. I once plugged my Air compressor into a 100' extension cord (can't remember the AWG size, probably 14) because it was handy. Motor wouldn't run, just hummed. Thought the unit was dead. Plugged back into wall socket. It ran fine. Repeated the "experiment" and sure enough, it was the extension cord. I think I have used a 25' 12awg extension without a problem, but yup, undersized extension cord will keep non-portable tools from running. A 20A circuit should have minimum 12AWG wiring.

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kopeck

06-01-2007 14:34:10




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 Re: Radial Arm Saw motor again... in reply to bil b va , 06-01-2007 14:25:05  
I agree with you except that this thing is fairly old, I think it's from the 60s and worked pretty darn well for my grandfather all those years.

Also have a table that's about same vintage and that this built like a tank, I really like it. All cast, decent fence, cuts well, can't beat that!

I like Craftsman hand tools but I wouldn't touch their newer power tools.



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kopeck

06-01-2007 14:13:25




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 Re: Radial Arm Saw motor again... in reply to kopeck, 06-01-2007 13:45:51  
Oh and here's the parts page at sears if it helps at all:

Sears Radial 100 #113.29411



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