Another fun day of playing with my XXL has brought up more questions. This time it was while trying to calibrate for belt stretch. I used a dial indicator attached to my Z axis plate and happily found that X and Y were dead on, moving exactly 1mm when told to. All axes had a problem where, approximately 70-80% of the time they would take a double step, moving 2mm instead of 1, but that was easily recognizable and I just divided the number in half when taking notes. The problem came when measuring the Z axis. Even when the other axes would take a double step, it was consistently the same length. The Z axis rarely gave the same answer twice. The pulley set screw was definitely tight, no help there. I noticed one side of the belt was a little looser than the other so I adjusted and tightened it, still no bueno. Finally I just took a series of ten measurements and took the average (range of 0.032"-0.038". Should be 0.03937) and reset $102. That helped a little as the next 10 measurements were within a tighter range, but still far from consistent. Just to make sure I’m doing this correctly, I open the MDI window in CM, type /$102=45.0071449 and hit Send? Any other thoughts as to how I can fix this?
Also, would an upgrade to GRBL 1.1 and CM4 help with the double steps? I’ve heard it often helps with the stutter I get while manually jogging. Is there an instruction set that spells out every step for upgrading/reflashing GRBL with 1.1 for us simple-minded window lickers who have never coded? Thanks again, all!