Solved G30 - Retracting after Z probe triggers
I hope everyone is doing well. I am building a small form factor 3D printer for teaching purposes. I am using a John FSR for my Z probe, which is wired to the Z probe connection on the Duet 2 wifi. When I call G30 the print head lowers until it triggers the Z probe. However, after triggering the Z probe the Z axis immediately retracts away from the bed until it reaches its maxima.
Looking at the documentation, this appears to be abnormal behavior. I would expect (and prefer) the Z axis to remain at the probing height after homing.
The bed is very small, so I am only probing the center once. Also, the FSR sits ontop of a 10mm thick aluminum disk, which I move onto the before homing the z axis.
; General preferences
M208 X-8 Y-7 Z0 S1 ; Set axis minima
M208 X127 Y166 Z80 S0 ; Set axis maxima
M574 Z0 S0 ; Define active low and unused microswitches
M574 X1 Y1 S1 ; Define active high microswitches
M558 P5 X0 Y0 Z1 H80 F120 T12000 ;
G31 X0 Y0 Z10.26 ;
Thanks for the reply Phaedrux, but I don't understand why I should adjust the dive height. Correct me if I am wrong, but isn't the dive height how far the Z-axis should travel before erroring out? If the Z-axis is at its maxima (80mm) and the dive height was 20mm it wouldn't reach the FSR.
Just to reiterate the problem: the z axis returns to the maxima after touching the probe, which wastes time because the print head then has to return back to the bed height before starting the print.
G30 will travel until it gets a trigger. The dive height is how high it will return to after it has triggered in preparation for the next probe, for instance when doing a G29 mesh.
Thank you for your response! All sorted out.