hi all. Can someone help my diagnose this issue. Its like my Z axis kicks back (see movie 9sec and 13 sec.) it loses several millimeters on every job. I can't get it to fail by jogging while I'm trying to pull it back, so it's not the load that s the problem. First it thought it was the cabling, so I changed all the cables to prober 4x0.35mm2 shielded cable. but thats havent solve anything. Here's the first part of the grbl code. Code: (Made in : Autodesk CAM Post Processor) (G Code optimized for OpenBuilds OX,Workbee,Sphinx,Lead with BlackBox GRBL V1.1 controller) (Program Name : 1001) (2 Operations in 1 files.) (File List:) ( 1001.nc) (This is file: 1 of 1) (This file contains the following operations: ) (1 : Pocket2) ( Work Coordinate System : G54) ( Tool 1: Flat End Mill 4 Flutes, Diam = 1.5mm, Len = 5.00mm) ( Spindle : RPM = 3000) ( Machining time : 5 min 21 sec) (2 : Drill2) ( Work Coordinate System : G54) ( Tool 1: Flat End Mill 4 Flutes, Diam = 1.5mm, Len = 5.00mm) ( Spindle : RPM = 3000) ( Machining time : 15 sec) G90 G94 G17 G21 (Operation 1 of 2 : Pocket2) G90 G53 G0 Z-10 G54 S3000 M3 G4 P1.8 X18.691 Y24.497 Z10 X18.691 Y24.497 X18.691 Y24.497 Z1.2 G1 X18.691 Y24.497 Z-0.05 F50 X18.685 Y24.487 Z-0.107 X18.673 Y24.457 Z-0.156 X18.667 Y24.409 Z-0.189 X18.681 Y24.354 Z-0.2 X18.726 Y24.256 F100 X18.897 Y24.147 X19.103 Y24.147 X19.274 Y24.256 X19.363 Y24.45 X19.333 Y24.656 X19.203 Y24.805 X19 Y24.867 X18.797 Y24.805 X18.667 Y24.656 X18.637 Y24.45 X18.681 Y24.354 X18.714 Y24.307 Z-0.189 X18.754 Y24.28 Z-0.156 X18.785 Y24.27 Z-0.107 X18.796 Y24.268 Z-0.05 G0 X18.796 Y24.268 Z5 X18.691 Y24.497 X18.691 Y24.497 Z1 G1 X18.691 Y24.497 Z-0.25 F50 X18.685 Y24.487 Z-0.307 X18.673 Y24.457 Z-0.356 X18.667 Y24.409 Z-0.389 X18.681 Y24.354 Z-0.4 X18.726 Y24.256 F100 X18.897 Y24.147 X19.103 Y24.147 X19.274 Y24.256 X19.363 Y24.45 X19.333 Y24.656 X19.203 Y24.805 X19 Y24.867 X18.797 Y24.805 X18.667 Y24.656 X18.637 Y24.45 X18.681 Y24.354 X18.714 Y24.307 Z-0.389 X18.754 Y24.28 Z-0.356 X18.785 Y24.27 Z-0.307 X18.796 Y24.268 Z-0.25 G0 X18.796 Y24.268 Z5 X18.691 Y24.497 X18.691 Y24.497 Z0.8 G1 X18.691 Y24.497 Z-0.45 F50 X18.685 Y24.487 Z-0.507 X18.673 Y24.457 Z-0.556 X18.667 Y24.409 Z-0.589 X18.681 Y24.354 Z-0.6 X18.726 Y24.256 F100 X18.897 Y24.147 X19.103 Y24.147 X19.274 Y24.256 X19.363 Y24.45 X19.333 Y24.656 X19.203 Y24.805 X19 Y24.867 X18.797 Y24.805 X18.667 Y24.656 X18.637 Y24.45 X18.681 Y24.354 X18.714 Y24.307 Z-0.589 X18.754 Y24.28 Z-0.556 X18.785 Y24.27 Z-0.507 X18.796 Y24.268 Z-0.45 G0 X18.796 Y24.268 Z5 X18.691 Y24.497 X18.691 Y24.497 Z0.6 G1 X18.691 Y24.497 Z-0.65 F50 X18.685 Y24.487 Z-0.707 X18.673 Y24.457 Z-0.756 X18.667 Y24.409 Z-0.789 X18.681 Y24.354 Z-0.8 X18.726 Y24.256 F100 X18.897 Y24.147 X19.103 Y24.147 X19.274 Y24.256 X19.363 Y24.45 X19.333 Y24.656 X19.203 Y24.805 X19 Y24.867 X18.797 Y24.805 X18.667 Y24.656 X18.637 Y24.45 X18.681 Y24.354 X18.714 Y24.307 Z-0.789 X18.754 Y24.28 Z-0.756 X18.785 Y24.27 Z-0.707 X18.796 Y24.268 Z-0.65 G0 X18.796 Y24.268 Z5 X18.691 Y24.497 X18.691 Y24.497 Z0.4 G1 X18.691 Y24.497 Z-0.85 F50 X18.685 Y24.487 Z-0.907 X18.673 Y24.457 Z-0.956 X18.667 Y24.409 Z-0.989 X18.681 Y24.354 Z-1 X18.726 Y24.256 F100 X18.897 Y24.147 X19.103 Y24.147 X19.274 Y24.256 X19.363 Y24.45 X19.333 Y24.656 X19.203 Y24.805 X19 Y24.867
