I’ve seen a few threads on this issue, but none that have solved my problem. I have a new Shapeoko 4 XXL. All projects I have run have been designed in Carbide Create.
Setup: New Shapeoko 4 XXL with BitSetter.
The issue: When using the Pocket and Contour tool paths, the depth of cut ends up being almost exactly 61.5% deeper than programmed. For example, the pocket is set to be 0.700 inches and it ends up being 1.13 inches. This same issue results regardless of the programmed depth: 0.250 inches becomes 0.40375 inches, 0.500 inches become 0.8075 inches.
In this particular instance, I’m simply trying to mill a larger pocket with a smaller contoured hole inside. Both the pocket and contour tool paths result in deeper than programmed cuts. This problem does not present it self in the vcarve tool path; the two projects I ran with the vcarve tool path were at the correct depth.
Because the issue results in cuts that are almost identically 61.5% deeper, I’ve been able to work around the issue by simply reducing my designed cutting depths by 61.5%, which has worked so far. However, this is clearly not a proper solution.
I checked the G-Code and the code shows the proper depths, so it’s not a code issue. I’ve checked to make sure my zero is properly set to the top of the stock, so that’s not the issue.
I read in another thread to try jogging the machine in Carbide Motion and measuring the distance the Z-axis travels. I did so, but the results don’t make any sense. I zeroed the Z-axis at exactly 2 inches above my wasteboard. I then jogged the Z-axis down 0.500 inches (or so it showed in Carbide Motion). However, when I measured the distance with calipers, it actually moved 0.9140625 inches (117/128"). Of course, that means it traveled nearly 83% more than it should have… I would have understood if it traveled 61.5% more than it should have, but it traveled more.
I’m at a complete loss for what the issue could be. It seems obvious the issue is related to the z-axis, but the numbers don’t match up, so I don’t know. Any help would be greatly appreciated.