6 Attachment(s)
Electromagnetic chuck controller
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I have purchased a rotary magnetic chuck that was part of a surface grinder. Unfortunately when the seller scrapped the rest of the machine, he also scrapped the controller, leaving just two bare wires.
When I got the chuck home I tested it with 12V DC and it does indeed work and has a 50 ohm resistance. It has stamped on the side 110V 240W which with ohms law gives us the 50 ohms I measured.
I need to be able to power the chuck. I can purchase a controller from Taiwan but at $400 I think I can build something much cheaper, especially as I do not expect to be using this a great deal. So if someone can go give Ray a poke as I am sure this sort of thing is right up his alley.
I think I need a 110V DC variable power supply that has the ability to also inject AC power into the coil to demagnetise everything when the job is finished.
I am suspecting something like a variac 0-110V device, a bridge rectifier plus a capacitor to smooth out the ripples. Then some sort of switch to bypass the bridge rectifier and inject AC for demag mode.
I already have 110V AC on hand as the optical comparator I got has a whopper of a 240-110V transformer in it.
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