well at work we have air and 110volt Electric Die Grinders they are Bosch and they get sum hammer and they are still gowning strong this is a tip sum of you may no this but on hi end electric tooling their is a for a beater way of putting it a safety fetcher in the carbon brushes that once the brush wears dawn to that point a plastic peg cums out of the brush and disengages the brush to stop the motor for you to replas the brushes
krv3000, proud to be a member of MetalworkingFun Forum since Feb 2012.