I have noticed recently when planing a surface with a cylindrical cutter, there is a step of about .020 inch per inch in the Y direction. My Z axis is not quite perpendicular to the Y. I already want to redesign and rebuild the z axis because it is not stiff enough to resist cutting forces in the Y direction to my satisfaction. As I design a new base for the Z axis, I need to get the mounting holes in the right place to correctly orient Z to Y. My solution is a test plate with the following pattern:
The G-Code is so simple, I just wrote it in a text editor.
I used the program to cut a piece of hardboard:
A week and a $10 hard drive later (Thanks, Habitat for Humanity Restore!), I drilled out the holes and mounted the board on the saw. Then I fixed a pencil in a board and drove the y-axis to mark a line across the board: