I'd love to know this as well, especially using it to route out larger holes (eg, 1mm, 2mm, 5mm etc ) - And whether it can handle it in larger holes through the entire PCB or whether it needs to go through in stages.... I tried a 1.8mm cutting tip and tried to cut through a full PCB in one operation, and the chatter was horrendous even at slow speeds. But in 7 steps, it was fine, even at full speed.
David.