Retiring the wiring…

…how did Isaiah know the earth was a sphere, over 2700 years ago? Isaiah 40:22…

Looking at the jumble of old wires, I decided I can replace the wires from Motor to FORS with one 5 core cable, which I bought from B and Q.

In “A bit of a shock”, the second image is of a connecting block attached to the back of The Base. This was evidently so that the motor could be disconnected from The Base without going into the FORS and disconnecting wires, which would be fiddly. Instead of the connecting block, I’ll put in a 5 pin cable connector.

I opened the wire case on the motor…

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…and took note of the positions of each wire and which terminal it eventually connected to on the FORS. The terminals in the motor are numbered…

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…so tracing back from the FORS I could correspond motor terminals 1 to 4 with points A1, A2, Z1 and Z2 in this diagram…

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…and so produce a Revised Lathe Wiring Diagram…

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Now I’ve got a proper complete understanding of all the wiring.

Next, I cut the 5 core wires to length and prepped them…

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…then connected them to the motor at one end…

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…and to the 5 pin plug at the other…

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I put the wire cover back on the motor to complete that end of the job…

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I hope that cable’s long enough.

Next, I needed to drill holes to mount the 5 pin socket to the back of The Base. I used these drill bits in the large hand drills…

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The 5mm twist drill started each hole by making a small conical depression. Then I followed with the step drill to open them out without the risk of jamming. This is the result…

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The large centre hole is the existing hole. I cleaned off the burrs on the inside with a file. I connected some cable, threaded it through the large hole and attached the socket with 5mm bolts and lock nuts…

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This the end result…

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Pretty robust. More than it needs to be, but there there are no small, easy to operate, 5 pin connectors. This is actually for 415 volt 3 phase systems. I’m using it because it’s all I could find with 5 pins.

Next, the NVR Switch…

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