Single phase reverse electrical genious required

[NJHParticipant @njh]

Martin

I see that you have been mucking about with this motor since June last year – time to give up maybe? Get another motor and get on with USING your lathe!

N

[Frances IoMParticipant @francesiom58905]

it’s very doubtful that the insulation on the windings you have left in would be safe to reuse – you also have to sort out any centrifugal switch or find another way to switch out start windings – maybe a great tho expensive, especially in time, learning experience which I suspect will still not result in a reliable working motor.

[Les Jones 1Participant @lesjones1]

I agree with the previous two posts. The original switch may have provided a method to control the power to the start winding but with your lack of electrical knowledge I don't think you are capable of working out how the original switch works. I also do not think you are capable of rewinding the motor correctly as you do not seem to work out how to connect things. You just seem to swap wires around hoping that it will work.

Les.

[J HancockParticipant @jhancock95746]

Read up about the labours of Sisyphus before you start rewinding that motor.

[Martin NewboldParticipant @martinnewbold]

Hi everyone and thank you for your comments. There is no centrafugal switch in this motor at all just a temperature switch which was between the two coils. The coils that are left read a good impedance and seem to be good .

Frances am unsure what insulation there was there between the coils but am aware of nomex being used in other rewinds. In addition some people on youtube are reusing motor wire in motrs and other application quite successfully so I am unsure why you state it wont be reliable

Les there is an instruction booket in the switch I brought . You have told me on two occasions that there is a centrifulgal switch which there is none. further more you said "You just seem to swap wires around hoping that it will work." . When did this happen ? Further more if i have a lack of electrical knowlege it may be because no one else here has any either, as no one chose at the time to point out anything was wrong with my wiring. You started this rant without even looking at the circuit diagrams I posted so I do not know why you are being offensive . When you dont know me. I thought ths forum was here to help people.

Read up about the labours of Sisyphus before you start rewinding that motor? can you provide a link please?

[Martin NewboldParticipant @martinnewbold]

The spindle ad electrics is here there is no centrigugal switch:

[Eric ArthrellParticipant @ericarthrell78468]

Martin Electricity can be fatal. silent no smell and deadly

If you are not 100% sure pay an electrician to do the job.

[Brian OldfordParticipant @brianoldford70365]

Having followed the thread off and on during its progress, the absence of a centrifugal switch make me wonder if it could be a shaded pole motor. They are often used on machines that do not need a lot starting torque. A fan or a spindle moulder might such a machine. They are not reversible.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Martin Newbold on 10/05/2017 15:49:44:

Read up about the labours of Sisyphus before you start rewinding that motor? can you provide a link please?

.

Martin … allow me: **LINK**

http://www.mythweb.com/encyc/entries/sisyphus.html

MichaelG.

Edited By Michael Gilligan on 10/05/2017 18:56:39

[SillyOldDufferModerator @sillyoldduffer]

Hi Martin,

I hope you won't take this amiss but you remind me of a very good friend of mine. He's a smart cookie, very good at most of what he does and very confident. He has a blind spot though; he thinks he's good at everything, and no-one is that! Once in a while he comes a cropper and can't believe he got it wrong.

Electric motors are not simple and they are not all alike. I find them very confusing. Reading back through the thread I see a couple of places where you asked for help and then missed requests from experts like John and Les asking for more information. What they were trying to do was establish what type of motor you have and what the various connections are for. I can't see where you answered their questions, which is why Les suggests you've been guessing.

Later you published a series of wiring diagrams: I didn't realise these were asking for help, rather I thought you were telling us that you had got the answer! You seemed to be making good progress,

Francis (who knows a bit!) advised against reusing the old motor wiring. He's absolutely right. Once a motor has cooked all the insulation is compromised. He's trying to help – he doesn't want you spend a lot of effort repairing a motor that's likely to fail again.

Others have tried to explain that rewinding a motor by hand is seriously difficult to do. It will take forever, and it may not work when you've finished, even if the insulation is OK. It's akin to me (a very inexperienced Model Engineer), saying I'm going to start by free-lancing a 2-10-2 locomotive in 9" gauge and is it OK to soft-solder a boiler made out of Titanium.

If I were you I'd start again. Buy a new motor with a data sheet. I'd try with a VFD and 3-phase, they do work despite your first bad experience. Once bought I'd come back on the forum and start a new thread asking what to do. John, Les and others have successfully helped many others with lathe motor problems. The secret is for you to carefully answer their questions and patiently take their advice so that they can guide you through the maze.

I was going to advise you not to get discouraged. Looking back I don't think you need that. Your adventures with electrics may not have gone well but no-one can criticise your determination whilst the photos show you've done a fine job on the mechanical side.

Cheers,

Dave

[Mike PooleParticipant @mikepoole82104]

We used a material called Elephantide to line the slots and red fibre to close the slot. The coils were bound after installing in the the slots with flat cotton tape. The wire size is measured after the coating is removed by burning off as the size does not include the coating.

Mike

[Neil WyattModerator @neilwyatt]

I am worried that this thread is encouraging actions that could prove fatal.

When it comes to advanced work with the mains, and I definitely include motor rewinds in that category, you don't just need to know WHAT to do, you need to know why you do it.

There's been a warning not to reuse old coils because they may be damaged. They may well not be broken, or even shorting out when tested with a multimeter, but unless they are tested with a proper high-voltage insulation tester like a Megger, there is NO WAY of knowing whether they are going to be safe when running.

Any cut corners could easily lead to a third motor failure, which could have more drastic results than the first two.

I don't want to lose any forum members…

Neil

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