I am interested in the drilling parameters used for 10 mil drill bits when drilling PCMCIA printed circuit boards. The other factors that would be important are stack height, material thickness, copper and dielectric thickness as well as number of layers, etc. To make an easy to understand example, consider a 6 layer board with half ounce copper inside that is 16 mils thick with 20 mil pads. What stack height, feed and speed would you use? How many drill bits would you expect to break during one table load with 5 heads, and what length flute would you use? What would be your preference as to retract rate and dwell time? How far would you go into the backup? What Brand do you prefer for backup and entry materials and do you use entry material? What kind of drill splay would you expect on the bottom panel? Did I say this was an easy to understand example? SRT