Facing operation, chip thining doesn't work

[ole.alex]

I'm trying to use chip thinning/rolling into the cut when doing a facing operation, but enabling chip thinning does not change the toolpath.
I've tried several different tools, but not difference, i guess it must be a bug?
Surface finish is poor on the start of the cut which is the reason i would like to test chip thinning.

[seth.madore]

Nope, it doesn't look like it works, does it 🤔

I've opened up CAM-44050 to investigate this, thanks for letting us know!

[csl1016]

[seth.madore]

@csl1016 

Ah, Pass Extension prevents the use of Chip Thinning. Good to know, thanks

[Don.Cyr]

@seth.madore Search through the CAB, I'm pretty sure I remember seeing some discussion about this a while ago..

[seth.madore]

Yeah, I recall seeing that thread, but didn't follow it too close. I took a tally of how many channels I'm involved in; 118 separate channels. It becomes rather difficult to keep tabs of what conversation came from where (and when)

[ole.alex]

So chip thining is working, but can't be combined with one of the default settings, i'd say that's a good reason to create a warning message when combining chip thinning and pass extension since pass extension is enabled by default.

[seth.madore]

Yep, that's what the ticket I created is about:
"Chip Thinning" does not work when a Pass Extension is defined. Possible improvement to warning or tooltip?"

[oleg.tikhomirov]

It looks like algorithm checks stock. I see that "chip thinning" works when "stock offset" is used instead of "pass extension". Cutting paths are not exactly the same but similar.