Fusion 360 cam misshap with rapid first move

Software
1

Hi guys.
My fusion 360 standard GRBL post processor and also the easel post processor does a weird thing (seeing as i dont have limit switches on my cnc).

When exporting Gcode from carbide create the first rapid move looks something like this:
G0X100.00Y100.00Z3.00

But my fusion gcode looks like this
G0X100.00Y100.00
Z6
Z3
Z2.55

This makes the machine rapid without lifting the Z (and as my Z0 are also stock0 this presents a problem)… After that it lifts the Z to late obviously.

Easel behaves as expected also

G1 Z3.00 F228.6
G0 X100.00 Y100.00

Is there a workaround for this in fusion? Is it possible to add something in the post processor maybe? sadly both easel and carbide create arent suitable for the kind of advanced cam i need to be able to make.

2

I’d strongly suggest you put the homing switches on the machine - it’s required for the newer versions of cc, cm, etc, and pretty inexpensive. This makes it pretty trivial to have machine zero != stock zero. Which GRBL post are you using?

3

Botg the original GRBL post for fusion and the official easel post.

4

Do you turn on the router with it at Z0? Before I had homing switches, I just manually raised Z before starting a job.
You could modify the post processor, but Fusion is changing its inner workings soon. Might just wait to see how that plays out.

5

You might want to try one of the others, like https://github.com/Strooom/GRBL-Post-Processor

6

I wouldn’t do that unless you know what you’re looking for. I was going to suggest the post I use (modified from grbl), but it uses absolute machine references. Without homing switches, you’ll be asking for trouble worse than scraping the surface at Z0.

7

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