[NY65912]

You cannot use too much pressure. You have to feed slowly and let the teeth cut. I have done a ton of holes in all sorts of materials. You need poser but have to finesse the feed rate.

We use Hole Hawgs on jigs strapped to the pipe we're punching holes in for mechanical tees and its all about the feed rate. We also use magnetic drill presses on steel beams with annular cutter, same principle.

I screwed up arm when I was drilling 1" holes through joists with a Milwaukee ˝" Magnum Drill, thought it was gonna rip my arm off. I was pushing too hard.