I haven't done any engraving yet (heck, I don't even have a machine yet!) but I know there's a difference between diamond coated and diamond impregnated bits. When the coating on diamond coated bits wear down, the bit is pretty much toast. On the other hand, diamond impregnated bits last much longer (and cost much more) because as the material breaks down, fresh diamonds are revealed.
Do they make impregnated 'engraving' bits?
Carlo |