His invention makes use of the lever, one of Renaissance scientists’ six simple machines ... At the end of the lever of a typical hole punch is a sharp metal cylinder that, when the lever ...

[bitluni] took matters into his own hands and built this nifty DIY hole punch for light-gauge sheet metal. A little backstory will probably help understand why [bitluni] needs so many holes.

which ultimately affects the life of both punch and metal sheet. Spacing between holes also matters. It should be at least two times the sheet thickness (2T), if not more. Distance between holes ...