Precise Cutting of Heavy Brass Tube
The rod is 1/2" diameter with a 1/4" inside diameter.
The multitool is level and square to the machine and locked to a piece of 2x4 by landscaping tape and hot glue. Not exactly a permanent fixture but good enough for the job.
To actually cut the rod, I used the keyboard function, "D" set at 0.001" and set the zero position within 0.02" of the multitool blade. Then I just arrow keyed the tube into the rod with the RPM's at 6,000. The wire runs up the tube a short distance and catches the rings as they separate.
To repeat, I move Y to zero, zero Z and lowered the Z to the desired depth for the next cut.
I made a couple of test cuts to calculate kerf and see how good the cut quality was and then subsequent cuts were good. I needed 12 at 0.250" and 4 at 0.500".
After cutting, I cleaned them up with a disk sander and they were ready to use.