grbl/bCNC probing and setting WCS zero with plate/tool offset.

General CNC CNC Routers
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grbl/bCNC probing and setting WCS zero with plate/tool offset.

Can anyone share their setup and tips with probing to set WCS Z (and XY) zero?

I’ve seen all the nice Mach3 videos (looks like they are using a canned cycle).

We should be able to script the same things with the user buttons on bCNC…

I’m just having trouble getting my head around everything. I have a nice probe with a circular hole for edge finding also.

I currently can probe Z and it will stop on the plate, but then where do I apply the plate thickness?

If anyone can share their workflow, I’ll see about scripting it up. Thanks.

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Under the probe tab you can set the offset but you have to use a - number. You can search this on YouTube and there are some videos.

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@Jamie_Wilson Thanks, I’ll try the negative offset and search again on Youtube.

One last question – So TLO should be negative, but what goes into the Pos: fields? From memory, I had X and Y blank and then had a -25 in the Z to probe down a max of 25mm.

And I’ll try and find a good youtube vid. Thanks for the help (I did have a positive TLO…)

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Ok – found a good video:

Steps are probe down, probe stops, hit Z=0, type negative TLO, then hit set. The WCS Z then shows the positive TLO in the WCS.

Thanks!