Small motor repair assistance
Small motor repair assistance
(OP)
Hello, thanks for having this forum. I have a 1/2 hp electrical motor on a Toledo pipe threader. I would like to repair the motor and I will need some advice on how to do it. When I push the on switch it kind of growls and dims the lights a bit but won't start. I removed the end bell on the shaft end but cannot remove the armature. The frame is molded and the other end bell does not come off by design. I removed the brushes and they are quite healthy, even though one brush cap cracked in the removal process. I can see the commutator through the brush holders and it looks great. It is a nice coffee colored brown and looks as smooth as a baby's butt. But the problem is that the armature will not come out. It turns very smoothly, but I don't want to force it for fear of breaking it. I'll attach a photo to show how it looks.

Thanks for your help. Regards, Jim

Thanks for your help. Regards, Jim





RE: Small motor repair assistance
Many of those machines have a large multi-connection plug between the switch and the motor.
That is another possible failure point.
It may be that the male plug is not fully inserted in the female plug. (Sort of an electrical coitus interruptus.)
Bill
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"Why not the best?"
Jimmy Carter
RE: Small motor repair assistance
RE: Small motor repair assistance
Link
RE: Small motor repair assistance
Green is the ground.
White is the neutral.
Black is the hot.
The motor will have two wires from the brushes and two wires from the field.
1> Connect the white to a field wire.
2> Connect the black to the foot switch.
3> Connect the other wire from the field to a centre terminal on the switch.
4> Connect the foot switch to the other centre terminal on the switch.
5> Connect the two field wires to either of the two end terminals of the switch.
The current flow should be into the foot switch.
From the foot switch to the reversing switch centre terminal.
From the switch end terminal to the field.
From the other field lead back to the switch on the other end terminal.
From the other centre terminal of the switch to a brush.
From the other brush back to the white wire.
Bill
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"Why not the best?"
Jimmy Carter
RE: Small motor repair assistance
RE: Small motor repair assistance
RE: Small motor repair assistance
The reversing switch should have a centre off position. It is also more convenient if the switch is maintained contact rather than momentary contact.
These machines worked fine without a foot switch for years until the foot switch was introduced as a safety measure.
The hand held power threaders used a momentary switch.
The tripod and leg mounted threaders used a maintained switch.
Bill
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"Why not the best?"
Jimmy Carter
RE: Small motor repair assistance
RE: Small motor repair assistance
http://www.ebay.com/itm/181599274899
Does it have the specs that I need? Thanks, Jim
RE: Small motor repair assistance
The switch has a 230 Volt rating so we may assume good breaking clearances.
The question is how long to failure?
The switch may last indefinitely.
The switch may fail in a matter of weeks or months.
You may see an "HP" rating somewhere on the switch.
I am guessing that you will not be submitting this to the local inspector for an inspection. grin
You will be assuming all liability.
We sure won't accept any liability if you use an unrated switch.
If you go ahead, let us know how long it lasts.
The price is attractive.
Stay in touch.
Good luck.
Bill
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"Why not the best?"
Jimmy Carter
RE: Small motor repair assistance
Rocker switch spec sheet
RE: Small motor repair assistance
A quote from Bill Murray;
"I wanna party with you!"
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Small motor repair assistance
At least something has developed in my 75 years.