I just produced a board that had a couple of 3mm diameter drill hits. I purchased a suitable set of drill bits for use with the machine, but when it went to drill those spots it followed the same procedure it does for smaller diameter bits, meaning that after a brief hover over the board it rammed the drill bit down through it in a single go. This works ok for small diameter bits because the amount of resistance to the bit is minimal, but in the case of the 3mm bit, it produced enough friction that it exerted more force on the drill than the magnets could hold, causing the hole to be slightly displaced from where it should have been.
An easy way to solve this problem would be if the Voltera would ‘peck’ at the board. By this I mean drill a little bit, then raise, then drill a little further, then raise, etc until reaching the target depth. Alternatively, allowing me to adjust the Z feed rate to slow it down would help too.
