"Unless you're drilling through thin sheet metal, use a lubricant," the expert explained. "I tend to use thread-cutting oil for everything, but there are many options. Not lubricating will dull ...

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.

Sheet metal is very easy to ... maybe even to the point of competing with a CNCed metal die. Considering that this was a first attempt without a lot of pre-existing knowledge it went pretty ...

Learn More › When you need to precisely drill through metal, cobalt drill bits are the ... The test materials included scraps ...