tube notcher
It's not the best in the world, but it has served us well building cages notching 1 3/4" .120 wall DOM tubing.
Just put your drill press on a LOW speed and keep the bushing well lubricrated.
If you are going to TIG, get one that uses a hole saw, but get a bi-metal blade. The cheaper ones are less rigid and you have to go slower to keep the blade from jumping. On my HF tool, the threaded part of the spindle eventually fatigued off, but it lasted a couple of years
For the all-meat-weenie, look at the tool from Metzler that uses a mill cutting tool in a fixture to machine the joint. fit up is perfect



