Z zero problem with new Carbide Motion version

[VGGrafe (Gerald Grafe)]

Working with Shapeoko 3 XXL. Encountering problems probing Z.
The situation:
Initialize machine.
Manually set x y zeroes.
Use touch probe to set z zero (metal block, alligator clip to the tool). Probe cycle appears to work as before.
Auto measures bit length after z probe cycle.
Rapid position Z position. Z zero page shows z = 0. But tool is actually above zero by 9.625mm.
Manually set z zero works fine.
Some setup parameter that I don’t have right?
Thanks for any help.

[gdon_2003 (Guy Donham)]

Rerun your configuration. The HDZ and Z-Plus have different steps per MM and if you picked the wrong Z that can make you come up short. Make sure you which Z you have. the HDZ has a bearing at the bottom of the lead screw. The Z-Plus has a stud with a hole in it that the lead screw goes through.

[VGGrafe (Gerald Grafe)]

Thanks. Tried config again. Definitely have HDZ (visual verification, dug out the original paperwork to be sure). Re-ran configuration, and behavior is the same. Using Shapeoko touch probe C3DSOPROBE.

[WillAdams (William Adams (Carbide 3D))]

Did you configure for the correct type of BitZero?

Note that there are two ways to position the unit — fully registered on a corner if probing for all 3 axes and fully supported on a surface if probing for only Z (or other single axis w/ a v1).

See:

Using/verifying the BitZero

Here is how I check out the functionality of the machine/BitZero: first check that you have sent the correct Z-axis configuration This can be easily done by jogging down to the wasteboard surface, setting zero, then using the Rapid Position command to lift 6mm above the current zero — measure how much the machine moved — if it’s wrong: open the Log Window go to the MDI (EDIT: Note that it will need to be enabled in options in current versions) and send $$ and check that the Z-axis steps/mm …

[VGGrafe (Gerald Grafe)]

P.S. Found it. I’ve never had to select V1 or V2 before, so my eyes just glazed over that part of the interface. Made the right selection, and function is correct. Thanks for the patience, and just file this in the “is it plugged in? is it turned on?” file.

(original post just for completeness)
Thanks for the quick response. I used JOG to move in Z 100mm (as shown on the Carbide Motion interface). Measured actual travel matched that, subject to measurement inaccuracies of less than 1mm. So the step size is correct (or very very close to correct). Testing the z - I used the touch probe, set it on the surface, and probed to the top by “probe z” in carbide motion. Tool measurement is done by C3D-BS1 Shapeoko Bitsetter. I didn’t see a config option to select among different types.

Reading your previous response, my current guess is that BitZero v1 is thicker than V2 by about 9mm, and my config is using V2 dimensions, while I’m probing a V1. I just updated Carbide Motion, and didn’t see anywhere to select V1 or V2. Will go back the machine and see if I can find something. Appreciate any more guidance. Thanks!

[ScottsdaleSteve (Steve)]

@VGGrafe

my current guess is that BitZero v1 is thicker than V2 by about 9mm

Good guess. I have both. Subject to the accuracy of my caliper, the V1 is 25mm thick and the V2 is 15.6mm thick. So a difference of 9.4mm.