You could also switch back and forth between the various work areas to allow the metal to cool a bit in between. See All 32 Photos Once each hole was fully tacked in place with four welds each ...

to 1 in.), 350 to 1,000 rpm is recommended. For clean, precise holes in thin sheet metal, make a wood sandwich. Simply ...

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[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.