For some reason, after I load a g-code file and hit run starting at (0,0,0), the Z Axis hits the Z end stop after moving up. When I restart the machine, sometimes it just barely hits it and the job continues. Is there a way to prevent the spindle from rising so high before the job starts? I'm using HSMWorks with Solidworks. I'm thinking that this maybe some firmware adjustment in the BlackBox? These are a few of the first lines that are generated. Thanks! Spoiler: See GCode (Contour1) (T1 D=3.175 CR=0 - ZMIN=-5.5 - flat end mill) G90 G94 G17 G21 G28 G91 Z0 G90 (Contour1) G54 M8 G0 X20.987 Y2.732 Z15.24 Z-5.182 G1 Y2.74 Z-5.253 F381 X20.988 Y2.764 Z-5.32 Y2.802 Z-5.38 X20.989 Y2.852 Z-5.431 X20.99 Y2.912 Z-5.469 X20.991 Y2.979 Z-5.492 X20.992 Y3.05 Z-5.5 X21.015 Y4.446 G3 X20.703 Y4.768 I-0.317 J0.005 G1 X19.268 Y4.792 F1000 X19.124 Y4.794 X18.837 Y4.803 X17.401 Y4.845 X17.258 Y4.849 X14.961 Y4.941 X14.817 Y4.948 X13.956 Y4.992 X13.813 Y5 X13.669 Y5.01 X13.079 Y5.054 X12.951 Y5.066 X12.521 Y5.111 X12.377 Y5.126 X12.233 Y5.146 X11.803 Y5.206
Your postprocessor is generating a G28 safety move. GRBL (in the controller) default G28 to 0,0,0, the same as machine home (which must be Z as high as it will go). what you need to do is move it off the switch, just enough. in the serial console (I assume you are using OpenbuildsCONTROL) give these commands after homing (if you dont have home switches then please search this forum for the 'fake the home' resource) G21 G0 X-1 Y-1 Z-1 G28.1 Those commands will move away from the home position by 1mm and then set G28 to that position. Now the G28 G0 Z0 will move to this set position instead of the actual machine home.
