The diamond polisher at work is calibrated on 4 cycles to cut exactly halfway across the holes of a stamp sized sample of a circuit board, the stamp sized section being encased in an acrylic resin mount we make and clip onto the arm of the polisher in a frame. I have been practicing hand grinding and polishing the past 2 days at work with limited success. Half the time what I am trying to grind and polish goes flying across the room...