Myford ML7 replacement motor.

[Glen Morgan 1Participant @glenmorgan1]

As my Father spoke to Myford I can't comment on exactly what was said but apparently they offered no help, other than providing a wiring diagram the same as the one on the motor.

Thanks to the information provided on here I know understand how it should be wired, but really that should have come from Myford themselves.

It appears that the blue wire needs to be extended out of the motor and to be wired to the wiper terminal on the reversing switch, with the red and brown wires connected to the remaining terminals.

I will have another look at the switch to see if it is an original Myford item, and to see whether it can be wired to achieve this.

Thanks for all your help so far.

[John Stevenson 1Participant @johnstevenson1]

Posted by Glen Morgan 1 on 05/05/2014 23:19:03:

 

Thanks to the information provided on here I know understand how it should be wired, but really that should have come from Myford themselves.

 

 

 

 

Sorry No.

 

Any motor you buy nowadays and have done for many years comes with a simple diagram similar to the one in your photo. So because the plate was on the supplied motor Myfords DID supply you with the information.

 

It is then up up a competent person to correctly wire this in. Any competent electrician is capable of doing this.

 

Long short is, if the two 'electricians' your father consulted could not do this then they are not competent, sorry no other answer.

 

Now the picture has been posted we have plenty on here who could wire this in and I dare say most are not electricians.

 

You would have stood more chance of success showing pictures of the motor plate and reversing switch, which we still don't have a clue about make and type.

Asking where the red and black wires go never works for the simple reason not everyone kept to red and black.

Edited By John Stevenson on 05/05/2014 23:50:24

[Glen Morgan 1Participant @glenmorgan1]

The red and black wires I am referring to are in the motor, as per the diagram.

[Bob Brown 1Participant @bobbrown1]

"competent electrician" Some are only competent to wire your house (domestic) so do not expect them all to know how to wire in a motor.

[Les Jones 1Participant @lesjones1]

Glen,
Have you tested the motor works in one direction as it has been suggested by Nick ? This is good advice as it will prove the motor is OK before changing any connections in the motor terminal box. As you do not seem to want to give an idea of your location to see if any of the members are close enough to help or any pictures of the inside of the connection box on the motor there is more chance of errors being made in changing the wiring.

Les.

[Nick_GParticipant @nick_g]

Glen,

I realise that you are trying to do something that is alien to you. We all realise that.! – Nobody is looking down on your lack of electrical knowledge.

Ask many members here how to do something as simple as baking a cake and they would look with a glazed and confused expression. Some however will be accomplished cooks. – The point I am trying to make is that anything is easy "when you know how"!

People here are trying to help you. It's what the ethos of this site is about.

What frustrates those people willing to help on all types of forums is when someone asks for advise then does not follow it and blames everyone else but themselves.

Get a length of flex with a plug on one end. Disconnect the motor from all external wiring and connect the plugged flex and switch on.! This will prove the motor is good, then come back to us and we can 'help' you take it to the next stage.

I am a newbie to model engineering, I know next to nothing concerning this topic. As such I will be asking in the near future many basic (and probably obvious) questions. People here will 'willingly' advise me. – It would be very foolish of me then not to follow such advise.

My job is a photographer. But I did spend 22 years as an electrician. What I am trying to do is imagine myself 'in your shoes' with limited knowledge and test equipment at my disposal.

Unfortunatley I do not live anywhere near you. Other wise I would willingly come and do this for you in return for a cup of tea and hobnob biscuits.

Cheers, Nick

[John Stevenson 1Participant @johnstevenson1]

Posted by Bob Brown 1 on 06/05/2014 07:18:47:

"competent electrician" Some are only competent to wire your house (domestic) so do not expect them all to know how to wire in a motor.

 

Disagree.

The diagram is very clear, it's not rocket science, only 4 wires, in fact only 2 if you don't want reverse.

Have you seen the wiring layout for a modern central heating system ? they are supposed to understand them and they are far more complex than this motor.

 

EDIT just read Nicks post which came in whilst i was stabbing keys and I fully agree with what he says, my remarks might be taken as negative and probably are because not all the information is given.

I for one would gladly spend time drawing a diagram out and posting it IF I had all the information.

What is missing is details of the reversing switch.  Without this no one, competent or not, can SAFELY advise on the complete system.

Edited By John Stevenson on 06/05/2014 11:00:33

[Glen Morgan 1Participant @glenmorgan1]

Now my Father is back we have had a chance to have a look at the new motor and the existing switching arrangement.

We got the new motor running CCW by connecting the live and neutral to the line connections as suggested, and then switched the red and black wires over to get it running CW.

The old motor was wired with a permanent live and a neutral and also had a switched live feed going to either the red or black wires on the terminal block to achieve forward or reverse.

There is a junction box at the back of the lathe, which needs further investigation, and there are 6 connections to the reversing switch, which is shown in a photo below. We need to remove the switch and test the contact arrangements.

The new motor seems to differ, in that it tries to run with the internal black and red wires disconnected, so even if the reversing switch can be used I think an additional on/off switch will also be required.

I'll post again when I have more information.

Reversing switch.

Motor connections.

Motor identification plate.

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