Boxford 280 T. electrical fault

I don't know that lathe but have a few machine tools with varying voltages for different applications such as main motor, feed motor etc. I've seen transformers fail and a pain if they're odd sized and fit in a tight enclosure with little chance of an off the shelf replacement. What is the 110V and 12V used for, you've indicated the 12V may be for the light, what is the 110V used for? You could probably just use a 240V to

If the rcd has tripped, it suggests leakage in the motor windings or other powered item to ground. You need to isolate both and use a megger or solid state equivalent, to check for leakage from any winding to frame. Quite common for insulation to fail an older motors.

Assume this is a single phase motor ?. I rebuilt a Boxford A a few years back. Put in a 3 ph 2hp motor and vfd. Kept all the original pulleys and set the vfd for 25 to 75Hz o/p. Reason for the 2hp motor is that power goes down quite a it at 25Hz drive. Great range of speeds though...

Regards,

Chris

The OP mentioned he could run the motor by manually actuating the contactor so not the RCD. RCDs can go bad, mine started tripping whenever I turned on my TIG welder so I had the TIG welder tested and it was perfect so had the RCD tested and it was bad and got replaced. The electrician advised using the test switch on the RCD at least every 3 months to exercise it, a mate recently replaced his and the sheet with it said once a month.

Perhaps he can run it, but it's not safe to do so until the failure reason is known. RCD's are there for a reason and bypass them at your own risk. Foolish thing to do, especially in what may be a damp workshop environment...

Chris