Z-axis going below the stock bottom

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

Did you position the BitZero at the corner and probe all 3 axes? 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: go to the MDI and send $$ and check that the Z-axis steps/mm match your machine setup: Belt-drive: 40 Z-Plus: 200 HDZ: 320 ​ ​c.f., Then, clamp a sui…

You would be 3mm too low if you position it at a corner and probe for Z only.

How accurate was the measurement of your stock?

If you instead set the origin at the surface of the MDF and jog up by the stock thickness as specified in Carbide Create and then set zero there, where is that in relation to the top of the stock?