Hello everyone. I built an OX and have completed the "Hello World" without a problem. My problem starts when I post for grbl from fusion. When I start the machine, it starts out fine going to the starting point, then it slams straight up on the z hitting the switch and stopping. My board is the xpro from openbuilds. I've "all home" without any problem and also set a different 0 point to start from. I've I've tried the included grbl and the strooom without any improvement. I've read many post and believe I'm close but still need a little help. Here is the start of the code. I appreciate any advise. (1001) (Top Cutout) (T4 D=0.25 CR=0 - ZMIN=-0.75 - flat end mill) G90 G94 G17 G20 G28 G91 Z0 G90 (2D Pocket6) T4 M6 S5000 M3 G54 M8 G0 X11.4398 Y14.6405 Z1 Z0.5 G1 Z0.125 F20 X11.4391 Y14.6413 Z0.1179
Make sure to use Fusion 360: grbl post processor install (the easy way) Make sure your machine homes Z toward the top (away from the workpiece) Z0 in Machine Coordinates has to be at the top of your Z axis
Thank for your reply but still no joy. Still just start and then z shoots up and hits limit switch. This happens after in has been “home all” and then moved a little and rezero z on stock surface. Vid and pic included
How much z-height have you got? The z25.4 while it's still in G0 mode from above catches my eye in the code, and the video appears to agree; it looks like it G53 rapids to 3mm below the switch, which is fine, but then later tries to go to a position above it in G54 coords. Proper grbl work area settings should have voided that move, but to test just try changing that line to z10 and see what happens.
Update. Changing Z25.4 to Z10 allowed the cnc to run as it should until it came to that same Z25.4 later in the code. So I'm going to say that's the problem. I have to find where to change that in post while in fusion. If you guys know where to change it along with changing it to allow inches instead of mm, could you please advise. In any case though, thank you guys for helping another beginner out.
