Evening all, nice out, isn't it?
I'm hoping to pick some brains, I recently acquired an ancient and abused [1] Challenger lathe[2], mainly for the tooling and motor that came with it, and I think I'd like to get it running to get back in the hang of machining while I find what I'm actually looking for (a Holbrook would be nice...) at a price I can afford!
Being a fan of skips, the dump etc. I came across an old Audi air-con pump complete with electromagnetic clutch for two quid[3], dismantled it and found it's pretty simple to adapt (apart from the spline in the hub, would have to bore it and cut a keyway) - I believe that these are called on to transmit upwards of 5HP (certainly putting 12V at 4A up it locked it pretty firmly), it occured to me that I could use this as a drive clutch for the
3HP (eek! possibly a bit over-sized for a small lathe...) single-phase motor that came with the lathe, on either the motor output shaft or the countershaft-that-needs-to-be-built, can anyone see any glaringly obvious snags that I haven't?I've had the motor connection box open, and have sussed out how to reverse it, should I want to, but would like the added safety of braking it - I've seen a few references to DC braking, wonder if anyone has had any practical experience of it? I assume that it's just a case of dumping Several Amps into the motor coil and letting back-emf/induced current in the rotor drag it to a halt?
Thanks in advance for any help!
Dave H.