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Have you encountered this problem yet?


I am newbie, my problem is when I check thickness by color after generate a finish milling, the value in red box less than zero. Is the tool cut into the part? How to fix this problem? Thanks for reading!

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Re: Have you encountered this problem yet?


This is photo! 


Re: Have you encountered this problem yet?

Valued Contributor
Valued Contributor

Hi Vanphu,


3D CAM paths are typically approximations. The amount of permissible deviation from the actual surface is controlled by tolerance. You can specify tolerance in Cutting parameters->stock (you've actually pre-specified this when you chose method) 




There are also settings that influence accuracy of simulation. Adjusting these might make some of the perceived inaccuracies go away. There's always a trade-off; more accurate simulation is slower.


In my experience the actual cutting results tend to be better than simulation, as long as tolerance is set tight enough. You might like to google "chordal tolerance" to get an in-depth idea of CAM tolerances.



Re: Have you encountered this problem yet?

Esteemed Contributor
Esteemed Contributor

Our tightest tolerance for milling is +/-0.01mm, with a part stock of 0.5 and higher we increase the tolerance to +/-0.1mm, to speed up the tool path generation.

Stefan Pendl, Systemmanager CAx, HAIDLMAIR GmbH
Production: NX10.0.3, VERICUT 8.1, FBM, MRL 3.1.7 | TcUA 10.1 MP7 Patch 0 ( | TcVis 10.1
Development: VB.NET, Tcl/Tk Testing: NX12.0 Preparing: NX12.0

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Re: Have you encountered this problem yet?

You need to determine if the tool is really violating the part by .06, or if the report is due to tolerances.

Have you identified where on the part the system thinks the -.06 is? In show thickness, set the max to 0, and leave the min at -.06, to help find the area.

As suggested above, you may need to adjust the tolerances in the operation or verify to get a more accurate display and report from show thickness by color. 

Mark Rief
Retired Siemens

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