Which way is Z axis minus?
Z minus/negative should be down.
If you need to reverse this, there are a couple of ways to do it:
- reverse one of the pairs of wires in the Z-axis connector (left- or right-most)
- reverse all of the wires
- change the invert bit setting in Grbl
To do that last:
- connect with Carbide Motion
- bring up the Log window
- bring up the MDI
- send $$ to get the settings — note the value for $3 (invert bit setting for Grbl 0.9)
- add or subtract 4, e.g., if 0, send $3=4; if 6, send $3=2
Thanks for the reply, I cheated, swapped the whole plate around. Now looking for squaring procedure.
Squaring Gantry to Front/Rear Plates
- Loosen all of the screws that hold the gantry together (4 on each side), these should still be loose from the initial assembly.
- Loosen the screws that hold the Y axis rails in place (16 total). These should also still be loose from the initial assembly.
- Slide the gantry to the front, so both Y plates are touching the front plate.
- While holding the gantry against the front of the machine tighten the front of the Y rails (8 total)
- Now - systematically begin tightening the 8 bolts on the gantry. Work your way from left to right, going back and forth in a X pattern (similar to tightening the wheel of a car).
- After the gantry has been secured, slide the gantry to the rear of the machine and tighten the 8 screws while keeping the gantry pressed against the rear plate