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Z level finish doesn't like undercut

Valued Contributor
Valued Contributor
I have a part with a very slight undercut. The undercut appears to be impossible to cut with z level finish(3-ax) unless Roll over corners is enabled. This again causes some unwanted moves. Any tab/option to enable finishing the undercut area with a ball mill that has the necessary geometry (thin shank)?
16 REPLIES

Re: Z level finish doesn't like undercut

The Zlevel profile operation does not do undercuts.

I would use surface contouring, with the projection vector sideways.

fasc_undercut.jpg

Mark Rief
Retired Siemens

Re: Z level finish doesn't like undercut

Valued Contributor
Valued Contributor

Thanks again Mark,

 

I figured this was the case. Is it still ok to user the roll method? The path looks ok as far as I can tell?

First pic without roll, second with.

without corner roll.jpgwith corner roll.jpg

Re: Z level finish doesn't like undercut

Esteemed Contributor
Esteemed Contributor

Z-level profile is not meant to machine undercuts, this has always been the case.

If you need sharp edges, don't use roll over edges.

If you need to machine an undercut use fixed contour or variable contour with a projection vector that points to the part, in your case YC.

Sorry machining undercuts in NX is not as trivial as in other CAM software, this was always the case.

You may want to create an ER at GTAC to increase the number of users requesting that feature.

Stefan Pendl, Systemmanager CAx, HAIDLMAIR GmbH
Production: NX10.0.3, VERICUT 8.0, FBM, MRL 3.1.4 | TcUA 10.1 MP7 Patch 0 (10.1.7.0) | TcVis 10.1
Development: VB.NET, Tcl/Tk    Testing: NX11.0 EAP, NX12.0 EAP

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Re: Z level finish doesn't like undercut

Valued Contributor
Valued Contributor

Thanks Stefan,

 

I'd be more than happy to use fixed or variable contour. However I'm having massive problems with the drive geometry/projection geometry. I can't share the file so I'll stick to your suggestions and try to figure it out.

 

Thanks/Harri 

Re: Z level finish doesn't like undercut

Valued Contributor
Valued Contributor

Tried to create an ER but got the following:

 

Our customer records show that you do not have first level support with Siemens PLM but instead have contracted through a third party.
Please contact your distributor or reseller for technical support.

IDEAL PRODUCT DATA OY
+358-9-54048429
http://www.ideal.fi/en/info/product-support/

 

Guess I'll have to try through our reseller..

Re: Z level finish doesn't like undercut

Valued Contributor
Valued Contributor

Stefan,

 

Have to ask; which drive method for fixed contour and how should it be set up?

 

Harri

 

Re: Z level finish doesn't like undercut


hjoy wrote:

Stefan,

 

Have to ask; which drive method for fixed contour and how should it be set up?

 

Harri

 


I used surface area, but you could use streamline or boundary. The main idea is to set the projection vector normal to the tool axis.

You can't use area milling or flowcut, because in these drive methods the tool axis and projection vector are always aligned. 

Mark Rief
Retired Siemens

Re: Z level finish doesn't like undercut

Valued Contributor
Valued Contributor
Try as I might, I can't get a "z level" path. Support was also unable to create a good path. I have about a gazillion different iterations of squiggles but nothing usable. Any pointers?

Re: Z level finish doesn't like undercut

Esteemed Contributor
Esteemed Contributor

We could help you better, if we could get the part or an approximation of it, which also includes the tool you like to use and the area you like to machine.

Without this information it is hard to build an example.

Stefan Pendl, Systemmanager CAx, HAIDLMAIR GmbH
Production: NX10.0.3, VERICUT 8.0, FBM, MRL 3.1.4 | TcUA 10.1 MP7 Patch 0 (10.1.7.0) | TcVis 10.1
Development: VB.NET, Tcl/Tk    Testing: NX11.0 EAP, NX12.0 EAP

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