When you’re boring through sheet metal — and make it look like you didn’t use a chainsaw while drunk — just any bit won’t do. “Quick” and “simple” aren’t words we generally associate with drilling into steel or aluminum, but that’s what the Rotabroach promises.
Rotabroach Cutters are designed for precision hole-making in mild steel, stainless steel, or aluminum sheet metal and plate stock up to ½” thick. Their power and finesse comes from the tooth geometry, which is designed to prevent chip clogging.
We could see where this would be a plus. It’s pretty easy for a burr or chip to knock the bit out of alignment with the hole. Because the bits are hollow, they cut around the edge of the hole like a hole saw, so less work is required and no deforming of material or jagged edges occur — as long as you don’t push too hard.
The Rotabroach system will fit 3/8″ and 1/2″ chucks and uses either spring loaded pilots or “skip-proof” pilots which eliminate pre-drilling operations.
They look like a good alternative to some of the older technology of hole making. Even a bad hole from a conventional drill can be cleaned up a bit with a file or in some cases (not sheet metal) plug welded and started over. With that said the real point would of course be to drill it right the first time and go on to the next step in the project — and any advantage that a bit like the Rotabroach can yield is a welcome addition.
Street pricing starts at $23.