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Member postings for Bob Miller 2

Here is a list of all the postings Bob Miller 2 has made in our forums. Click on a thread name to jump to the thread.

Thread: Skomo Tablr Saw - Brook Crompton motor wiring weirdness
23/12/2021 18:10:41

Thank you everybody for your massively helpful replies.

Safety wise, I wasn't touching the machine while testing, only the switch of the socket that the RCD socket is plugged into.

I wired live to AZ and neutral to A and earthed the case via the blue screw bottom left. The machine now runs. I can't believe how quiet it is. Having read the replies, I will move live to the T terminal, if that is a thermal switch.

To reply to each above:

not done it yet: I can't figure how the original owners consumer unit wasn't tripping while in that configuration. The sockets looked normal to me, but maybe there was something else the owner had been up to.

Ian Parkin: No diagram anywhere on the motor, only the panel in the photo.

Michael Gilligan: Yes, that's the same link in my post. A bit different, but very helpful.

DiogenesII: That's exactly as I have it now, which I feel better about having read your reply. Yes, I have a proper switch box to put inline between the machine and socket and will make it all sensible and safe. Having read noel's reply, I will use a proper motor starter instead.

Ady1: I will run this machine on the RCD, even after I have my consumer unit professionally fitted to my workshop with another RCD in the consumer unit in my house.

Stuart Smith 5 & Ian: Yes, I will get the same certified chap who is coming to install my workshop consumer unit, to take a quick look, just tho be safe.

noel shelley: Sure, this is done,. I was just trying to mimic what the original owner had done for testing. I'd not even considered a motor starter. Iremember seeing one of these saws sold previously on eBay with what I thought was just a huge switch next to it, now I know it was a motor starter. £40 to £50... I'll get reading.

john fletcher 1 & Emgee: Great point abiout the sawdust, I'll give it a thorough going over.

Martin Johnson 1: I was looking at glands and similar ealier and after reading other replies above, maybe mounting a board on the side of the machine to hold the cable and motor starter. I can probably 3d print and cast a rubber gland myself if I can't find one small enough.

SillyOldDuffer: I was digging around for my cable ties for a temporary strain relief earlier too. I'll try the T terminal tomorrow morning.


Thank you again guys. I will update once I have finished the machine.

Have a great Christmas.

Bob

22/12/2021 23:09:01

Hi

I wonder if anyone can help.

A while ago, for very little money, I bought a cool little bench saw (Photo 1) with a Brook Compton motor (Photo 2) from the son in law of a deceased amateur carpenter. I saw the saw working at the home of the late amateur carpenter and was looking forward to using the saw at home.

The saw sat in my garage for a few months before I got around to using it. The first time I plugged it in, the saw tripped the RCD it was plugged into. I opened the panel on the back of the motor to see if I could see what was going on (see photo 2). I saw 6 terminal points : From top to bottom : K, Z, AZ, S, A, T. Terminals K & S are blank. The plug was wired: A to Earth, T to Live and I found Neutral loose in the compartment; not connected to anything, assuming it came off on the trip home. Z only has 1 nut, so I assumed the neutral wire had fallen off of AZ as the end looked flat, as if squeezed between 2 nuts (no ring crimp attached and no empty ring crimp on any of the terminals) so tried wiring neutral to that as a test (Photo 3) using new cable and mains plug, wiring earth to A and Live to T as it was wired originally, plugged into an RCD socket all the while. Certainly looked odd to me, what with no earth to the case (bottom left of the compartment) The RCD tripped again.

I removed my wiring to try and make sense of it (Photo 5) I added the letter "T" to phpt, as the printed letter is obscured by the bottom wire.

I have seen similar Crompton motors in other posts on line, but with only 4 wires ( T and Z to the switch and AZ and A to run) (**LINK**/ but this motor has 6 wires.

The seller knows nothing about this saw. He thought the only way to use it was to plug it in... it runs.. unplug it... it stops. So I was just intending on putting a switch box in the cable, until this became very confusing. It looks like A definitely isn't an earth, so how on earth was it running at point of sale?

Any pointers would be very helpful.

Confused Bob.

Photo 1

Photo 2

Photo 3

Photo 4

Photo 5

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