I've got the same 1 Don's running & have been using it in large & small tube notching with 0 problems - even with CM tube & solid materials.

I also run a 6" end mill (From Mitler Bros,) for deeper angles on my 1 5/8 car tubing. Although Mitler probably has the best unit.........U can purchase a used mill for what they get for their tubing notcher!!! It is first class though.

regs