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Chester Model B

Replacement Motor Wiring

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Patriot15/02/2020 14:43:00
2 forum posts

Hello All,

Please could you help me connect a new Clarke motor to the Chester Model B Lathe, I’m not the best with electrickery. I’ve searched and searched the internet for various information but can’t seem to find the answer. So before I attach it and power it up I though best to ask the question just to be on the safe side.

I assume in order for the motor to rotate both ways I need to remove the 2 brass links and the four wires coming from the power and rotation switches will simulate this. The wires I have are 2 reds but identified V1 / V2 and 2 blacks U1 / U2.

Here is a picture of the Clarke Motor cover, could anyone please advise on how to wire it.

Thanks a lot.

David George 116/02/2020 13:14:15
1521 forum posts
472 photos

Hi welcome to the forum. Can you give us a little information about the old motor I have looked on the Chester web site but can't see any information about the electrics on there. A picture of the conection would be useful and where are you based gives people a rough idea who local may help.


Les Jones 116/02/2020 14:55:19
2225 forum posts
153 photos

I assume that the black wires (U1 & U2) feed the main winding and the red wires feed the auxiliary winding (Via the capacitors on the motor. If this is so then remove both links. Connect wire U1 to terminal U1. Connect wire U2 to terminal U2. Connect wire V1 to terminal V1. Connect wire V2 to W2. Before doing this confirm that the 4 wires are connected as I assume. WITH NO POWER TO THE LATHE confirm that with the forward reverse switch in one position (Forward or reverse. Ignore the off position if it has one.) you get an almost zero resistance reading between wires U1 and V1 and between wires V2 an U2. In the other position you get almost zero resistance V1 and U2 and between V2 and U1. If you do not have a meter I can suggest a method using 4 mains voltage lamps.
If you connect it up and forward and reverse are the wrong way round then swap over wires U1 and U2.


Patriot16/02/2020 16:25:54
2 forum posts

Hello David & Les.

I really appreciate you both taking the time to respond to my question, here is a picture of my original motor.

I’m not sure how it was wired originally, a college of mine removed it, pretty sure he has a picture though.

Hi Les, I’ll follow your guidance and let you know the outcome. I have a meter, a very basic one so hopefully it’s ok.

Thank you so much!

Will Taylor 113/02/2021 16:36:09
4 forum posts

Hi I have the same problem, I have connected the wires as above, does it matter what capacitor is Cr or Cs as when i turn the lathe on the motor trys to start but just won't go around. This is the same for either direction. Its a brand new motor from chester. Thanks


Dave Halford13/02/2021 16:50:06
1387 forum posts
12 photos
Posted by Will Taylor 1 on 13/02/2021 16:36:09:

Hi I have the same problem, I have connected the wires as above, does it matter what capacitor is Cr or Cs as when i turn the lathe on the motor trys to start but just won't go around. This is the same for either direction. Its a brand new motor from chester. Thanks


Cs = start

CR = run

They are different sizes so yes it does matter.

Oldiron13/02/2021 17:40:25
761 forum posts
23 photos

Patriot use this LINK to see how to post pictures here


Les Jones 113/02/2021 18:03:10
2225 forum posts
153 photos

Does the motor run with no mechanical load on it ? (I.E the drive belt removed.) The larger value capacitor is the start capacitor. I think as it is a new motor you should Return it and get a replacement. Is it connected directly to the mains or via the internal lathe wiring ? I am surprised that Chester have supplied a Clarke motor. Is the connection information supplied with the motor identical to the first post of this thread ? If you want to do some investigation of the fault this is what I suggest. Remove the two link bars. Measure the resistance between U1 and U2. This will be the main winding and I would expect a resistance of less than 10 ohms. Measure the resistance between W1 and W2. This will be the auxiliary winding and it's resistance will be greater than the main winding. (But probably less than 20 ohms.) Measure the resistance between V1 an V2. This is the contacts on the centrifugal switch which should be closed when the motor is stopped and the reading should be very close to zero ohms. Report the readings and we can tell what is probably wrong with the motor. (Not that it really matters as you will have to return it as faulty.)


Edited By Les Jones 1 on 13/02/2021 18:05:25

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