The drill is used continuously until it breaks (destructive test method).
Measured by a hole tester or images of the drilled hole under a microscope.
Swarf clogging is investigated inside the drilled hole and also on the entry board.
Swarf clogging (After plating)
Swarf clogging on the exit side of the entry board (Aluminum)
PRODUCT 01 PCB Drills / Routers / Ultra precision micro-hole drill
