Posted 12/15/2015 22:48 (#4963203 - in reply to #4963183) Subject: RE: Why do drills make a triangle hole instead of round in thin sheetmetal
This is true. In high school shop class the teacher had some picture of two holes, one done with a good sharp drill bit and one done with a reamer, and under a microscope of something the drilled hole wasn't round and was jagged and rough as could be. Reamed hole was perfectly round and smooth.
As far as sheet metal goes, I have a couple of step drills that work nicely on it. Hate drilling sheet metal with a regular drill bit.
Why do drills make a triangle hole instead of round in thin sheetmetal
