hi
we manufacture electro chucks and the controllers.. our customers also used to complain about this with our old design controller.. now we have developed a new electronic controller where, we give the demag pulses in steps to acheive demagnetization..
our test results with customers has been very sucessful even with very thin jobs....
you can visit our site
www.sardamagnets.com
for any more details please feel free to contact us.
dhiruj