Home aditional V/W axis individually with probe

SanderLPFRG

Hi all,

We have made a 3D printer with 2 micro-Z printhead axes (V and W), which move the IDEX printheads up and down 14mm to level 2 different tool types and automatically adjust/calibrate the printhead Z-offset.

We first got this system working with a microswitch type probe, which we, in a macro, temporarily reconfigured as an endstop for axis V/W, which we then "homed" towards the printed until triggered. When done for both tools, this calibrated the Z-offset automatically.

Now, however, we moved over to a loadcell probe (analog readout via configuring as scanning Z-probe, amplified and filtered with custom CAN-communicated PCB) which we cannot configure as an endstop to home towards.

My question is;
Is it possible to do a G30 S-1 probe (just probe and stop) with a probe number defined (K0/K1), but move axis V or W instead of the Z-axis

note;
running 3.6.0 beta-2

SanderLPFRG

@SanderLPFRG @gloomyandy or @dc42? any possibilities or workarounds??

gloomyandy

@SanderLPFRG Just a random thought, but what's to stop you from switching the axis around so that your V/W axis is actually mapped to Z? Not sure if remapping the axis will clear the homed state, but if it does you can probably just use a script to transfer the current position over.

gloomyandy

@gloomyandy Just to be clear I mean do the following... Move everything around so that everything is set up to do the probe operation, swap Z over to be on V/W do the probe then swap everything back again...

SanderLPFRG

@gloomyandy could work, but the issue here is that if I just move the drive mapping to set Z=V and V=Z. the axis could move out of physical bounds, which damages the machine.

Will test tho, but I think it does add value to RRF in the future, 'just' add a parameter to G30 command.

Another thought, could a G38.2 with V target position work? I don't fully get what the target position does here.

gloomyandy

@SanderLPFRG Sorry I should have said you will need to also swap over any axis steps/mm, limits etc. (I didn't say it would be easy!). Good luck!

gloomyandy

@gloomyandy Sorry no idea about G38.2 I've never used it.