I probed the corner using a 1/8" end mill (as the probe function doesn’t offer smaller), then swapped in my 1/32" end mill, and re-probed the Z.
Then, I ran my file. I was simply trying to carve a MAX depth of .063" with .016" passes, over a few different areas.
The bit immeditaley drove about .25" in on the first pass, promptly destroying my piece for a loss of about $40 worth of material.
Seeing that the piece was already ruined, I just let the file run. I figured let’s just see what happens.
Each subsequent part of the carve repeated this same gross over plunge. Even the parts that were only supposed to go .032" deep went over .25" after several passes.
I set some parts to cut .032" with .016" passes, which should have been two passes. Those did four passes.
I set the deepest parts to .063" with .016" passes, which should have been four passes. I believe that may have also done four pass, but WAY too deep.
All of the other cuts on this piece were exactly as expected, using the 1/8" end mill.
I even tried deleting all of those tool paths, redoing them, and running the file again on my pine prototype to the same result.
I’m running the latest versions of both Carbide Create, and Carbide Motion on a MacBook Pro, using a Shapeoko 3 XXL.
Didn’t reprobe this time, which is why it’s doubly odd.
I set this toolpath to do .032" passes, but I just checked with my digital calipers, and the first pass ran at .067".
Again, normal probe for the corner for this part. Reprobing for the smaller bit is much later in the carve, and I haven’t done that, yet. At least for this carve.
Sorry, was editing my message after I realized it was unclear. That is what you expected (0.813mm = .032in).
If it’s not a zeroing thing as @luc.onthego just posted, it could be a loose Z belt or pulley.
If it’s just .03 something too deep, it’s probably a zeroing issue. If it’s deeper or more random depths, it’s probably the Z pulley or belt.
How thick is your stock?
@neilferreri I just came down to check and it’s gotta be pushing a full 1/4" deep. Which is twice the depth I set. Stock is a full inch thick. Same as the last few.
@fenrus Nothing “crashed” that I’m aware of. Just suddenly started cutting way deeper than it should. All seems very controlled. Everything looks great, not sloppy or janky looking. Just a ton deeper than I wanted.
I’ll check the Z carriage and belts when this leg of the carve finishes.
The max I had set was .125" and the final max depth according to my digital calipers is .1685".
BUT!
I only set two depths. Deepest is .125" and the other is half that, at .063". You can see that the distance from the top of the lower carve is correct, and it’s just the upper portion that’s too deep.
The zeroing seems to be the issue, as it appears the issues takes place during the initial plunge only.
Question is… how do I fix it? Cause, I’m not going to lie to you, I’m not exactly a pro at this. I’ve only had this machine for a couple months. And, it’s my first CNC.
I’m using the Carbide 3D Touch Probe. Just following the directions. Same as usual. Literally nothing different than any other time.
Set the probe on the lower left corner. Center the bit over the circle. Drop it close. Click “Begin Probing”.
It touches the top, comes up, and goes over to the left side, drops and comes back to touch the probe, same for the front side. Comes back up and stops over the circle. Everything seeming as it should (I think).
I just zeroed the Z only, per instructions. Lets see how the 1/32" bit paths run.
I’m just using the backside of my prototype, so basically scrap. But, I’ll try manually zeroing after, if this fails.
