I need to notch some 6061 tubing for TIG welding...the diameter is
3/4" and the wall thickness is .065. I've got a drill press, so I tried clamping the tubing to the table and tilting it to the desired angle before attempting to notch it with a 3/4" bi-metal hole saw. The cut is very ragged, and I'm assuming this is caused by either the drilling speed, the lack of rigidity, or the hole saw itself. I've got a 5 speed drill press, and it's on the slowest setting (this is where I think it should be), and the hole saw is of the $10 variety from Ace. Do I need to change the speed and/or the saw, or do I just need to buy one of those jigs that attaches to my drill press, or something else?- posted
16 years ago