I have an old Walker electromagnet chuck and I really need some help figuring out how to wire this thing..

That exactly the circuit I used to test my magnetic chuck when first playing around with it (dimmer and a four terminal rectifier). Horrible waveform, mainly as I was switching 230Vac (325V peak) down to 110Vdc so a very short firing angle, but it worked.

Until I just turned off the supply (as opposed to ramping the voltage down with the dimmer) and I believe that is when the back EMF killed my first rectified. So a free wheeling diode or varistor or other snubber circuit is probably a good idea.
 
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