I just tried my first carve with the 1/32 bit on a litho... broke it at about 90% through the carve. I had the depth set to .180 with bit optimization set on best on a 1/4" corian board. Is that too much for the bit or am I just unlucky as hell? Also, when mounting the bit should you use a collar when inserting into the Colette? I sure can't afford the cost of one bit per carve.