Quote:
Originally Posted by g4wim_tim
I've used q max cutters and step drills with no problem on die cast boxes and aluminium.
However on thicker materials (2mm) I find the diameter of the hole is slightly different on each side when using a step drill as even they have a small taper.
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The trick here is to do the first bore with a cone-cut from one side of the workpiece then follow up with a second bore from the other side. Then your hole - when breached - is equally-chamfered from either side, with the narrowest part being half way through the material.