Programs always exceed positive Z limit at end

I’m just getting my router up and running, using Fusion 360’s generic linuxcnc.cps post processor to post to the machine, and one thing that always happens is at the end of the run, it trips hitting the soft positive Z limit. You can see it in the attached screenshot, which also shows the tail end of the gcode that ran. It runs normally in G54 with z=0 set to the top of work, more than 200 mm below the top of the Z-axis. Going to G53 Z0 should be fine; I can do it manually without tripping things (I think).

Any ideas? Thanks!

JetForMe wrote: I’m just getting my router up and running, using Fusion 360’s generic linuxcnc.cps post processor to post to the machine, and one thing that always happens is at the end of the run, it trips hitting the soft positive Z limit. You can see it in the attached screenshot, which also shows the tail end of the gcode that ran. It runs normally in G54 with z=0 set to the top of work, more than 200 mm below the top of the Z-axis. Going to G53 Z0 should be fine; I can do it manually without tripping things (I think).

Any ideas? Thanks!

Try bringing the soft limit down a bit . It might be overshooting

Try g90go g49g53.

Do you have a home offset for homeing?

In gcode you have 15mm, in the screenshot it is at 208mm ? How ? Why ?
Do you have a G21 at the top of gcode ?

In gcode you have 15mm, in the screenshot it is at 208mm ? How ? Why ?
Do you have a G21 at the top of gcode ?

Yeah, I've attached the program. The Z15 is in G54, which has z=0 set to the top of work.

Try bringing the soft limit down a bit . It might be overshooting

Wouldn't the machine know to slow as it approaches the target position? It does that for all other moves.

The homing configuration for the Z axis looks like:

What are the soft limits set at?

JetForMe wrote:

In gcode you have 15mm, in the screenshot it is at 208mm ? How ? Why ?
Do you have a G21 at the top of gcode ?

Yeah, I've attached the program. The Z15 is in G54, which has z=0 set to the top of work.

That is all good, but how did you get Z to go up to positive 208mm ? I do not see any offsets active in that screenshot.

tommylight wrote: That is all good, but how did you get Z to go up to positive 208mm ? I do not see any offsets active in that screenshot.

I've attached the full .ini file. I'm pretty sure that's 208 mm in G54.