I asked the same question on the Inventables forum, but I figured that I'd put it to the larger audience here, as well.
I'm having an issue with Easel making Z steps that are too large, on the Z axis only. I have a mostly stock Shapeoko 2, with a Dewalt 660 router, ACME Z screw, and a NEMA 23 Z motor, to handle the extra weight of the router. The X and Y precision seems to be right on, but the Z axis is making steps that are much too large. The only configuration settings that I could find, in Easel, are the selection of the Z axis screw type (I did pick ACME), and the feedrates. Has anyone else encountered this problem?
I have $2 set to the recommended value, in GRBL, for the ACME, being 188.947. I used UGS to do that.
The rest of my config parameters are as shown, below.
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Grbl 0.8c ['$' for help] >>> $$ $0=40.020 (x, step/mm) $1=40.020 (y, step/mm) $2=188.976 (z, step/mm) $3=30 (step pulse, usec) $4=250.000 (default feed, mm/min) $5=250.000 (default seek, mm/min) $6=252 (step port invert mask, int:11111100) $7=255 (step idle delay, msec) $8=25.000 (acceleration, mm/sec^2) $9=0.050 (junction deviation, mm) $10=0.100 (arc, mm/segment) $11=25 (n-arc correction, int) $12=3 (n-decimals, int) $13=0 (report inches, bool) $14=1 (auto start, bool) $15=0 (invert step enable, bool) $16=0 (hard limits, bool) $17=0 (homing cycle, bool) $18=0 (homing dir invert mask, int:00000000) $19=25.000 (homing feed, mm/min) $20=250.000 (homing seek, mm/min) $21=100 (homing debounce, msec) $22=1.000 (homing pull-off, mm)
It was suggested to me that upgrading to GRBL 0.9i would help the situation, but I am reluctant to do that, until I get a real handle on the problem.
Any advice would be greatly appreciated.