Z rapid feed in contour operation

[Anonymous]

Hello,

I am having issues with the feed in a simple contour operation.

Feed parameters are :

Lead in, lead out: 100mm/min

Cutting feedrate: 800mm/min

The G-Code output is:

(2D Contour4)
S5000 M3
G54
M8
G0 X93.2 Y3.4
Z17.13
G1 Z7.13 F800
Z3.13 F100
Z0.4
G18 G3 X92.8 Z0 I-0.4 K0
G1 X92.4
G17 G3 X92 Y3 I0 J-0.4
G1 Y-31 F800
G2 X90 Y-33 I-2 J0
G1 X-3
Z7.13 F100
Z17.13 F800
M9
M5
M30

I don't understand why the Z axis gets some moves at 800mm/min.

According to the toolpath analysis, they should be rapid moves. I tried a few postprocessors and they all output a G1 with cutting feedrate when I would expect a G0 for rapid move.

Is there something I set wrong?

[Arun.rs]

Hi @Anonymous 

Thanks for raising your concern via forum.

I checked the output with Fanuc post processor and I could not replicate the same. 

Kindly check with the Fanuc post and let me know the feedback, https://cam.autodesk.com/hsmposts?p=fanuc

Regards

[Anonymous]

Thanks for coming back to me.

The problem must be on my side, this is what I get from the Fanuc post processor:

I checked and I do have preserve rapids selected in the operation linking tab and in the postprocessor settings.

[engineguy · Accepted solution]

@Anonymous 

Just a thought, are you on a "Personal" free licence?? If so it no longer allows Rapid moves 😞

Stay Safe

Regards

Rob

[Anonymous]

Yes, that's correct, I am on personal licence.

I think this is a bad move from Autodesk. My machine will lose steps if trying to move the Z axis at cuttings speeds, which in turn can cause tool crashes and damage.

[engineguy]

@Anonymous 

Yes, agreed, it is not good but with a small machine like yours it is not likely to make a huge difference to machining times.

You are more likely to lose steps moving at fast rapid moves, friend of mine has a small Sieg Mill and he had to turn the Rapids down so in that respect you will be better off with the slower moves unless you try to take DOCs that are too deep and then it is possible to lose steps due to the high load.

Stay Safe

Regards

Rob