clarke cl 250 lathe and milling head

Have you checked the lathe and motor will turn freely? It may be worn out brushes, more likely than a shorted motor.

If the mechanicals turn freely and the motor isn't shot (it should run slowly on a car battery if you disconnect it from the lathe), then the control board may be shot. See if you can see any obvious signs of burnt out components.

Contact Clarke or Machine Mart for spares, or you could fit a C1 board from Arc Euro www.arceurotrade.co.uk/Catalogue/Machine-Spares/C1-Lathe-Spares I think Warco a, Chester and Axminster all sell versions of this machine as well. Not cheap, sadly - so do test the motor first.

Neil

Test the control system with a 100w light bulb in place of the motor.....

Hi Danny,
From your last post it sounds like the motor is faulty. Connect your multimeter to the motor wires to check the resistance between them. Note the resistance with the motor shaft position moved a few degrees at a time until you have rotated 360 degrees. The idea is to see if the resistance between all opposite commutator pairs is the same. I would expect you to get a reading of between 5 and 10 ohms. Only use the readings when the motor is stopped as the motor will generate a voltage while moving it between positions. If you get high resistance reading then measure the resistance directly on the commutator between segments spaced 180 degrees. If you then get the correct readings then there is a fault between the motor wires and the brushes. Or the brushes are not making contact with the commutator. I have just confirmed that an 180 volt 850 watt permanent magnet motor rated at 5000 RPM rotates OK on 12 volts.

Les.

Danny,

yes the motor can be repaired but the cost makes it uneconomical....best bite the bullet and buy a replacement..

Arc list the ZYT 150 at around £95....

Hi Danny, You say that the on/off pot is shot, remember that the on/off is different in that when you switch it on you are breaking the circuit. I think that it is called make to break type. It is not how you would expect the on/off to work. I got caught out on my CL300 some years ago. Good luck with it. Pat