"Eric R Snow" wroteclip)Also, for the demagnetization of the chuck isn't
the best way to achieve this is to apply ac and slowly decrease the power?
(clip)
^^^^^^^^^^^^^^^^^^
If you're talking about demagnetizing the chuck, meaning allowing it to let
go of its load, you may not have to be that elaborate. The technique of a
"tapering" AC field is needed when you need to get rid of ALL the residual
magnetization. And it is usually applied to the type of steel that holds a
field with the power off. Your chuck was probably designed not to hold a
residual field. Try just interrupting the power and see what happens.