you can drill through most metals at 3,000 rpm. For larger twist bits (11/16 in. to 1 in.), 350 to 1,000 rpm is recommended.

With the fate of repetitive motion injury looming due to the need to drill 1,200 holes, [bitluni] took matters into his own hands and built this nifty DIY hole punch for light-gauge sheet metal.

"I would absolutely recommend a center punch before drilling any hole into metal," the expert ... "If you're installing standing seam sheet metal to 2½-inch square steel tubing, it might not ...