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Author Topic: CNC runs different after loading Fusion Gcode  (Read 78 times)

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CNC runs different after loading Fusion Gcode
« on: March 04, 2020, 08:39:58 PM »
Newbie here.
I have a desktop cnc running Mach3 along with fusion360 and other design programs. carbidecreate etc...

Normal boot mach3 without gcode loaded and refhome, the machine runs fast and homes against the limit switches using the 20% speed.

When I load a gcode file from fusion360 and then do a refhome, the machine hits the limit switch at about 20% then moves far away from the switch and then slowly goes back to limit and then goes to some other point on the axis for home.
Works the same way on all axis.

I have tested a few gcode files made from other programs carbidecreate, etc. and the refhome works fine like it should and leaves everything close to the limits.

Is this something in fusion360 that is set wrong or something in the post processor that I need to change,edit delete.
I'm using the fusion360 mach3 post processor.
what should i look for in the gcode that might affect this.
is it the G94?


sample start of gcode from fusion..
(T7  D=0.25 CR=0. - ZMIN=-1.44 - FLAT END MILL)
G90 G94 G91.1 G40 G49 G17

T7 M6
S3820 M3
G0 X0.2796 Y0.0254
G1 Z0.0787 F11.5
G18 G3 X0.2546 Z-0.0394 I-0.025 K0.
G1 X0.2521