[mitchntx]

I have a cheap 16" drill press.

I bought a metal hole saw, jigged up a piece of tubing and attmpted to notch the end.

The hole saw would just catch the tubing and bind.
It appears the table isn't stable enough as it will move slightly.

I looked at a tubing notcher. But the one I saw jigs up to a drill press and I can forsee the same issues.

I can plasma cut and grind, but damn that is labor intensive.

How about sanding rolls? rock cylinders?

What is out there?

[trackbird]

I took a grinding wheel spindle (for a die grinder) that was designed as a threaded screw (not your usual "button head bolt" that holds the disc on) and stuck 5 grinding disks on it and used a 1/2 hp air powered die grinder to notch by hand. I'd just cut straight in with a sawzall, then make 2 45-degree cuts with the same sawzall (leaving a "semi-notch") and then round it out with the grinder. Effecient? Not really. Did it work? Absolutely. It's cheap and saved buying a notcher.

That's how I did mine.