Homing and Limit switches again

[LarryM]

@IsaacNeuman

You determine via grbl parameters which way the machine moves in a homing cycle (Inventable fork default is Z up, X left, Y front).

Using the Arduino/gShield electronics with grbl (Inventables fork) each axis has it’s own I/O pin. X axis is on D9, Y axis is on D10 and Z axis is on D12. These pins are hooked to the homing switches. grbl (Inventables fork) will first home the Z axis (move to homing switch contact, back off, approach again more slowly to contact, then pull off a small amount to clear the switch). Once Z is complete, X and Y will home simultaneously (same procedure).

Check out this thread:

Homing/Limit Switches

Looking at things from the grbl perspective, the term “limit switch” only applies for the X-carve if you use hard limits ($21=1) . Looking at things from the grbl perspective, all other cases for the X-carve the switches are “homing switches”. Homing switches allow soft limits ($20=1) to work. For this case the “limits” depend on having done the homing cycle and on the low end the limits are 0,0,0 and the limits on the high end are set by $130, $131, and $132. After the homing sequence the swi…