Can't get the first move of a 2D Contour to be safe

[FluffyAce]

So I've got a 2D contour move that engraves text on our little custom info plate engraver. I typed in the text, made a setup, got the stock set up correctly, and post-processed it with the OpenBuilds Black Box post (the engraver runs on a BlackBox). For some reason, the move to the first cut is being made at Z<1 and I can not figure out why. I've messed with every setting (except the plasma/laser settings), but the first move is always at the work surface and it'll hit the workholding screws. Anyone have any idea how to get that move to be safe?

EDIT: Forgot to mention that this machine does not have limit switches

Thanks!

[da_fish]

As in (I believe) all the milling strategies, the clearance height is where the tool retracts to at the start and end of the tool path and the retract height is where the tool retracts to between each cut with in the tool path.

If the white line in simulation is what your talking about. I don't think you need to worry about that. Usually simulation will start with the tool at xyz 0, which is usually not the case in reality. The white line shows the tool moving to the first position and if you start the program with the tool at a safe height, I think you'll be fine. I've never used that specific controller so you will want to be super carful to make sure what I said is true.

[seth.madore]

I suppose it's going to depend on where along the Z axis your machine starts. If the tool is below the surface of the part and your machine doesn't recognize a G28 move, it's possible that the tool will drag across the surface of the part.

[programming2C78B]

Ensure you raise the Z and re-connect your machine so that it uses that location for its G53 movement. 

[FluffyAce]

Checked all my clearance and retract heights. Still "crashed" on a test run without the stock material.

[FluffyAce]

Tested this, still got a sim crash. Machine re-homed the spindle, then dragged it through where the stock material would be.

[FluffyAce]

The machine homes to the work zero, which is at the surface of the work, then moves to the first cut position without raising the spindle. Once it's at the first cut position, it raises the spindle to the clearence height, then plunges the .2mm for the cut.

[programming2C78B]

from what I see you have a Start Z of -15! 

Ensure there is a G53 z0. posted at the start of your program

This is the grbl post I wrote and use. 

[FluffyAce]

Yeah that was to try and force the spindle to move at 15mm above the stock at the start. I assume that's incorrect?

[FluffyAce]

 There's a G53 Z0