I would like to improve my home-made 3D wood carving router. It has stepper-driven 1m long THK ball screws (bless you Ebay) which seem to be moving exactly as EMC2 commands, now that I have Helical couplers fixing the backlash. The next thing I want to check and maybe tweak is the perpendicularity of the 3 axes, which I bolted down using only a carpenters square and level as guidance. This is in a home wood working shop so the only instrumentation available is a dial indicator. If I can measure the axes, then corrections can be included in EMC, presumably as hinted at in the kinematics chapter of the Integrators handbook.
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