Misterm
New member
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 (the wire going off to the right of Photo 3); 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) (Wiring Up a Brooke Crompton Single-phase Lathe Motor (Myford Lathe) ) but my motor has 6 wires.
The seller knows nothing about this saw, as it belonged to his father in law. 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 shouldn't be connected to earth, so how on earth was it running at point of sale? I thought of connecting neutral to A... but guessed that would pop the RCD again, as A was already connected to earth and I don't want to damage anything.
There's a momentary switch on the bottom of the motor (Photo 6). I am guessing this switches between 2 speeds? I didn't even notice that when I bought it.
Any pointers would be very helpful.
Many thnaks.
Confused Bob.
P.S. I tried posting this in another forum, but it didn't seem to work... apologies if this is a duplicate.
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 (the wire going off to the right of Photo 3); 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) (Wiring Up a Brooke Crompton Single-phase Lathe Motor (Myford Lathe) ) but my motor has 6 wires.
The seller knows nothing about this saw, as it belonged to his father in law. 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 shouldn't be connected to earth, so how on earth was it running at point of sale? I thought of connecting neutral to A... but guessed that would pop the RCD again, as A was already connected to earth and I don't want to damage anything.
There's a momentary switch on the bottom of the motor (Photo 6). I am guessing this switches between 2 speeds? I didn't even notice that when I bought it.
Any pointers would be very helpful.
Many thnaks.
Confused Bob.
P.S. I tried posting this in another forum, but it didn't seem to work... apologies if this is a duplicate.
