Sieg baby lathe not starting

This topic has 10 replies, 9 voices, and was last updated 10 July 2021 at 15:46 by Mike Waldron.

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3 July 2021 at 13:20 #552419
Mike Waldron
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@mikewaldron61652
Can anybody help?

I have a Sieg Baby lathe that is a few years old, but hardly used. I’ve been about to set about cleaning it up for restoration but it won’t switch on!

I have a Sieg X1 mill/drill, so am familiar with the switching on order. Power is indicated, but it won’t turn on with the speed switch.

Any ideas anyone?

Mike
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3 July 2021 at 13:20 #28246
Mike Waldron
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@mikewaldron61652
Electrical Fault
3 July 2021 at 14:10 #552423
Howard Lewis
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@howardlewis46836
Presumably, the motor ran before the lathe was last used?

Ever the optimist, if the motor is brushed, and has not run for some time, maybe there is a poor contact, brush / commutator, or a stuck brush..

Assuming that everything appears to be OK electrically, spinning the motor by hand may urge it into life, and further running for a few minutes will restore things to as they should be.

If not you need to start tracing just how far the electrical supply is going through the circuit.

I would start at the motor (One method advised is to substitute a filament lamp for the motor and to check if the brightness varies according to the position of the speed control. ) band try to work backwards from there towards the input. Since some of the lights come on, the fuse is intact.Again, taking the easy way out, it could be that the track in the speed potentiometer is dirty.. Possibly, a shot of contact cleaner might get things moving again.

HTH

Howard
3 July 2021 at 15:32 #552435
Adam Mara
Participant
@adammara
I had a similar problem on my Chester lathe, turned out to be a bad connection on the push on connector for the emergency stop button. Don't know if you get 'dry joints' on those connectors, but my dad was a keen radio amateur and was always complaining about soldered dry joints!
3 July 2021 at 16:36 #552446
not done it yet
Participant
@notdoneityet
Description conjures up a DC drive but is it brushed or brushless?

Fed up with the Drummond? I would not be swapping in one of these for a Drummond.
3 July 2021 at 17:41 #552460
old mart
Participant
@oldmart
My 7 X 12 mini lathe has a fuse amongst the controls which used to trip when drilling. I changed from 1A to 1.5A and it is ok now, I hope I haven't overdone the rating.
3 July 2021 at 20:51 #552485
KevinW
Participant
@kevinw
There is a microswitch on the mounting bar for the chuck guard. If the guard is not fitted and the bar has been rotated it will not allow the motor to start.

Kevin
4 July 2021 at 11:21 #552542
larry phelan 1
Participant
@larryphelan1
A similar switch is fitted to the Craftsman lathe. Very easy to knock it off when removing the chuck guard.

Try turning the shaft .
4 July 2021 at 15:04 #552567
Mick B1
Participant
@mickb1
There's a fuse accessed by a plastic turnbutton on the far side of the C0's headstock.

Took me b100dy ages to think of it, but replacement fixed it and it hasn't blown again in a year of sporadic use.
4 July 2021 at 15:45 #552572
lee webster
Participant
@leewebster72680
A friend looked after my old lathe for a while. When it stopped working he discovered that the motor had got damp. It was removed and placed in a warm oven for a few hours. Fixed.
10 July 2021 at 15:46 #553548
Mike Waldron
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@mikewaldron61652
Many thanks all for the suggestions.

when I get time I will work through them.

Mike
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