Tool Height Behaviour

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robb

Robb
I'm running a 3D carving job. I've run this same job in the past, a few times, without problem. This is the first time I've run it since upgrading to 3.48 (G3) although I'm not implying anything.

At line 31515 the tool descends deep into the job and I have to hit E-stop darn quick.This code is for a Finish. The Roughing runs perfectly.

I've gone through the Finish G-code carefully and at line 31515 the Z value is -0.0823. Stopped machine at 31,515 and Z is actually showing -0.1264. This value doesn't appear anywhere in the code. This has happened twice with same incorrect value for Z. I've done the maths but, I can't equate the delta with anything showing on Masso.

Maybe someone else has experienced this and has a solution?

Robb
 
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drecoauto

Drecoauto
Hello Robb, i had the same issue except mine went up not down. it was a issue with fusion as i re-exported the code and it worked fine.
 
cncnutz

cncnutz

CNCnutz
Staff member
Hi Robb,

When you see a value on the DRO that does not appear in the Gcode this is caused by the resolution of your machine not being fine enough to get to the required position.

For example if your machine moved 0.1mm per step and you asked to to move to 1.06mm it would move to 1.1mm because that is as close as it can possibly get to the required value.

As for the actual position the Z axis moves to I checked on my machine using the file you provided, Z moves to -0.077" while the Gcode requests -0.0772"
Line 31515 N315140 G1 X0.3490 Y1.8135 Z-0.0772
Assuming it is the same file we are talking about.
I tried your resolution settings and it showed -0.077 as expected

You would need to provide the file you are using for this example and a screen print showing the jump to line page for this to be investigated further.

Hope this makes sense.
Cheers
Peter
 
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