single phase motors.

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Pete.:
Some motors have no switch, they run on both windings permanently.

Bluechip:

--- Quote from: DavidA on May 30, 2013, 03:11:08 PM ---Is there anything on the site about how to fit a reversing switch to a single phase mains motor ?

I need to make my lathe go in reverse for screw cutting. I'm using a 1 HP motor as bought from Machine Mart.

Dave.

--- End quote ---

Is this a new motor ??

There should be a connection diagram with the motor, often inside the access cover.

Why not ask Machine Mart ???

Just guessing which winding is which , is it cap start, cap start/run, split phase etc. etc. is nonsense.

Dave BC

DavidA:
Bluechip,

The motor was new about a year ago. There was a instruction with it for how to change the direction of rotation if it was incorrect for your application , However, this has long ago disappeared.
I had to reverse the direction when I fit it to my lathe. But can't remember how I did it. It has worked as it should for the last twelve month.

...Just guessing which winding is which , is it cap start, cap start/run, split phase etc. etc. is nonsense...

Of course it is. It is also dangerous and can lead to damage, My philosophy is never press a button unless you know what is going to happen. Or at least what should happen.

I am not intending to just connect random wires and hope for the best. My first serious job was as an apprentice industrial electrician. Were this a three phase motor I would be completely at home.

The motor will start and run using only the red winding. It won't start using only the white winding.

I may indeed try asking Machine Mart about this. But I was hoping that someone here may know. I suspect that MM will say 'we just sell them'.

I notice that Doubleboosts miller appears to have a similar motor attached.

The only real concern I have is in positioning the capacitor.

I suspect that the changing of the capacitor from line to neutral alters the phase lead in the start winding which dictates the direction of rotation.

Dave.

Bluechip:
David

MM do have a technical helpline number.

I have used them years ago for a pressure cut-out switch.

Very helpful and told me which one to get.

Not the one I thought was right ... :scratch: but one which was right.

If you don't ask, you won't know.

Not even premium rate.

http://www.machinemart.co.uk/pages/customer-service

Oooops now a 0871 used to be Nottm. Exchange

Dave BC

Rob.Wilson:
Hi Dave

I am a bit late to the party :Doh:

The dotted lines are link bars , If your fitting FW/REW switch you remove these completely .

Rob

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