I Was Not Successful at Using My Parting Tool

I wanted to cut a piece of aluminum tube down to 1.23" length but I could not find a feed and speed that parted it without pulling the tube out of the chuck. I thought of using the chop saw but I feared it would bend the fairly thin wall tubing while cutting it.

So I mounted it on the rotating table.

I needed to make very slow and shallow cuts because again the chuck is unlikely to hold the tube as tightly as it should. But why write a program specific to this operation? So I wrote a program called mksub that accepts zStart, zStep, and zEnd parameters as well as a string of gCode commands to execute at each step of Z. In this case, a move to degree 0, then to degree 360, and back to 0.

This is general enough that almost relatively simple gCode command can be repeated to any arbitrary depth with only a trivial change in the Makefile.