Boring machine with floating knife how much margin
then directly into the hole if the material is cut easily, drill directly to 53.5 semi-boring to 54.90
Directly drill to 50-52 rough boring to 54.5 semi-boring to 54.90
The margin size depends on the size and material of the workpiece bore, for example: the hole size is 30-500mm, the material is steel, the balance is 0.1-0.15mm.
