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Hi,the most likely explanation is that Mach3 or your BoB doesn't quite go all the way to 0V.With a multimeter measure the 0-10V signal and confirm the range it actually achieves, especially the bottom end.Note that is not correct to stop the spindle in Mach just by specifying zero speed (S0.00). You should use M5 becausethis opens the ON/OFF relay. If you rely on S0.00 any noise or linearity fault could cause the spindle to turn unexpectedlybecause the relay is still ON. This could have injurious consequences if you were doing a manual tool change.Craig
Hi,while its not perfect it is about what I would expect.PWM is quite hard to achieve if you must also have perfect 0% modulation simultaneously with perfect 100% and linearity.If your demands are that stringent then you should consider a step/direction servo and matching servo drive as a spindle.Craig