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Sieg baby lathe not starting

Electrical Fault

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Mike Waldron03/07/2021 13:20:54
40 forum posts

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

Howard Lewis03/07/2021 14:10:48
5550 forum posts
13 photos

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

Adam Mara03/07/2021 15:32:20
159 forum posts
3 photos

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!

not done it yet03/07/2021 16:36:29
6440 forum posts
20 photos

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.

old mart03/07/2021 17:41:12
3416 forum posts
210 photos

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.

KevinW03/07/2021 20:51:09
3 forum posts

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

larry phelan 104/07/2021 11:21:10
1119 forum posts
14 photos

A similar switch is fitted to the Craftsman lathe. Very easy to knock it off when removing the chuck guard.

Try turning the shaft .

Mick B104/07/2021 15:04:04
2047 forum posts
117 photos

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.

lee webster04/07/2021 15:45:54
20 forum posts

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.

Mike Waldron10/07/2021 15:46:08
40 forum posts

Many thanks all for the suggestions.

when I get time I will work through them.

Mike

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