Hello and thanks for reading this, my first post. Apologies if there is already a straight up answer to my issue somewhere on the forum that I overlooked.
Have had my SO3XL since Black Friday and love it. Has worked flawlessly on many projects with both big cuts and fine detail work. I use Fusion 360 for CAD and CAM-developed Gcode. I preview every toolpath. So this week… updated to Motion 5 (doing new setup process first) and executed a run to cut out a simple 2" cylinder from 3/4" maple. Using the same Whiteside 1/4" downcut endmill at 18K RPM and 40 in/min feedrate. Simple contour cut taking multiple 0.1" passes. The run started normally, then began drifting in the Xaxis every pass, finally going crazy and cutting deeply into the piece. See pic below. I ran this several times and even went back to Motion 4 (again, re-setting up)… same result. Belt tension seems good with normal snap test. Any ideas will be much appreciated. Thank you!
The default rapid speeds and acceleration have been adjusted for CM5 — it should be that checking your machine mechanically and retensioning belts and so forth will address this — if you wish to go back to the old defaults see: https://docs.carbide3d.com/software-faq/shapeoko-3-default-grbl-settings/
My bet would be a loose set screw on the X motor shaft
EDIT: maybe the more aggressive accels in use with CM5 may have cause a semi-loose setscrew to become really loose, and then reverting the CM4, the “damage” was done. Anyway, you should double check the set screw.
Spot on answers!! Both set screws on the X motor loose and off the flat of the shaft. I pulled the motor off altogether and reset the pulley, this time with red Locktite on the set screws. Haven’t had time to do a test cut yet, but feel sure this is it and I’ll report back shortly. Thanks VERY much for the near instant replies!
