A 9 mm hole in a sheet of plastic next to a 9 mm cartridge Another factor is control. Not all damage is the same and what will repair one sort of problem will be largely useless for another ...

Many applications, usually involving either mounting parts or routing wiring and other materials, require holes to be drilled or punched into sheet metal. As with any other typical fabrication ...

It uses simple plastic sheets with arrays of holes, and could be put to use in making ships invisible to sonar or in acoustic design of concert halls. Much research has been undertaken toward ...