Colchester revering switch wiring

[Charlieb]

I am repairing a square head 3 phase Colchester Student 1800. The control circuits all need replacing as the wiring is in a bad way. Problem is I can't figure out how the start and reverse switch wring should be connected. I have the circuit diagram in the Colchester manual but that doesn't go into the details of the start, reverse and stop switches. any photos of a working setup or diagram would be welcome.

 

[Janderso]

What year was this lathe made?
Round head right?

 

[Charlieb]

Square head from around early 1970s

 

[Charlieb]

What year was this lathe made?
Round head right?

Square head from around early 1970s

 

[graham-xrf]

The fundamental property of all three-phase machines is that the direction of the rotating phase field is reversed by swapping over any two of the incoming three phase wires. It does not matter which two. Your actual switch might achieve that, done on the same shaft with two ON/OFF switch arrangements.

There are folk here who have taken apart, and re-wired lathe motors of all kinds, and may even have a diagram for the Colchester - or failing that, can figure one out for you.

 

[Charlieb]

I'm Ok with the actual motor reversing bit using a 3phase reversing starter to replace the old contactors. What I am trying to figure out is how I can connect the old micro switches on the fwd/rev lever to work the remote start and stop on the reversing starter. The lever has a cam which activates a different micro switches one each for forward and reverse. The micro switches have both a NO & NC and previously both were used. I think I need to use the NO to control the start/Fwd but cant figure out how the stop would work.

 

[markba633csi]

Usually the contactors have a dedicated set of contacts to latch and hold in whichever direction has been selected. The stop button is often a normally closed type which opens the latch circuit when pushed
How much of this does your diagram show? How much of your original wiring is still intact? Can you post some photos? The more information you can provide the better we can help piece it back together
It would be kind of hard to draw this up from scratch, hopefully someone has a detailed diagram to work from, would save a lot of time and effort
-Mark

 

[Janderso]

Square head from around early 1970s

Oh, ok. Like mine. But a student.
I have the Colchester Triumph look alike.
Clausing marketed Colchester lathes under the Clausing-Colchester brand.
In the 70’s, they were good lathes made in Colchester England.

I’m including what wiring diagrams I have.
If you see one that you want to see closer, we’ll figure it out.