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 ...

ROCKFORD — You know the hole punches we have in our offices to punch holes in paper? Take that concept and apply it to metal. For 104 years, that's been the function of the Roper Whitney No. 5 ...

[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.

The 16-pound Eibenstock—the lightest machine in its class—can bore up to 50 holes through 18 inches of steel-reinforced concrete with one swappable ablative diamond bit. (The long metal ...

Typically the punching mechanism is shielded by a metal plate, with a hole for the puncher to fit through. The paper is placed under the first metal plate and above another. The bottom plate holds ...

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 ...