Summary

Coordinate Cube for programming CNC Machines
Rotary Axis is able to move freely (the golden rings)

Glue the mandrel, with the rings already slid on, into the cube.
pay attention to correct assembly.

X-Axis mandrel with A-Axis ring into the hole opposite to G19 plane
Y-Axis mandrel with B-Axis ring into the hole opposite to G18 plane
Z-Axis mandrel with C-Axis ring into the hole opposite to G17 plane