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This is probably going to be the shortest instructable ever but, hey, I'm new to this :)! I used to drill my PCBs using a normal, heavy driller (I guess that's why the mm tick bits usually didnt last too long ;)). I had a Dremel but I didn't use it for that
Center Drills Center drills are stiff, stubby little drills used to start holes in the end of workpiece. If you try to drill a hole in a workpiece without using a center drill you will find that the drill will most likely wobble off center and not drill straight into the workpiece.