by A&O » Tue Oct 17, 2017 10:00 pm
As I did a test today cutting a 3/4” hole in some spare copper plate, try not using hole saws. I made a right mess. I tried fast, slow, everywhere in between, light pressur and really leaning on it and what I found happening was the hole saw was chattering and generally making a mess. I wish I had my phone with me to take some photos. The holes ended up closer to 22mm, not round and rough as guts. And that’s using a brand new Milwaukee hi-metal hole saw.
My thoughts are to try with a step drill bit. What does everyone else use??