CNC-1310 Machine Z-Axis keeps going Upwards not into material!

[Foamycnc]

I use inkscape to make simple shape for engraving, makercam to generate GCode for the same, when sent thru grblControl 0.8.4 to CNC-1310 C Machine, it starts engraving normally, on second pass of engrave, the z-axis is moving upwards

not downwards through the material, no engraving!

Many thanks

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[robertspark]

Which way is the z axis motion going?

Is it positive or negative?

G1 Zxxx or G1 Z-xxx

The normal way is downwards is negative motion (think XYZ plane, Z- is down)

If the Z-axis gcode is negative, your machine is setup wrong, and you need to change the axis direction within grbl.

If the Z-axis gcode is positive, your post processor is setup wrong and you need to change your post processor settings.


Learn to read the gcode