Nice peace of equipment. Have just tried it with stainless steel, and that was ok. There was, however one thing that was not ok. There is a large power surge the moment you switch the machine on (or plug in the socket , if the machine is "on".) The power surge made the 16Amp fuse to blow, so I had to install a surge suppressor (NTC thermistor) on the power line inside the chasssis. After that all is working flawlessly.