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Setting correct +Z for drill op


When I create a drill operation, it's trying to drill the part from the bottom instead of following the MCS +Z axis. My part WCS +Z axis is in the opposite direction of the MCS +Z but this has been the case with other parts and hasn't caused this issue. How do I reverse the side of the part the drill is entering?



Re: Setting correct +Z for drill op

Siemens Phenom Siemens Phenom
Siemens Phenom

My guess is that your two holes have a chamfer on the "bottom" side.

The software, by design, changes the default machining direction from +Z MCS to the direction that matches the chamfer on the geometry. All you have to do is click "Reverse Direction" and your spot drilling operation will come from +Z MCS.


Your screenshot seems to indicate that you are using an early NX9.0.x version of NX CAM that doesn't yet offer the "Reverse Direction" capability. I would recommend that you at least upgrade to the most recent NX9.0.3 MP release (my screenshot is from MP12).


Tom van 't Erve

NX CAM Development


Re: Setting correct +Z for drill op


Hi Tom,


What about for the drilling operation, I have a hole with the same issue but revise does not work. I typically use the create--geometry--hole feature, that is where reversal fails. If I let it be and reverse it in the operation it works, but that defeats the purpose of defining hole geometry beforehand in the first place. I also had to use "Use 3D" In-process workpiece which dirties the toolpath everytime something above changes.



Re: Setting correct +Z for drill op

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor

One end seems to have a chamfer and the other end not, so you cannot reverse the machining direction.

A bigger diameter or thread is always machined first and therefore you get a fixed access direction.

Stefan Pendl, Systemmanager CAx, HAIDLMAIR GmbH
Production: NX10.0.3, VERICUT 8.2, FBM, MRL 3.1.7 | TcUA 10.1 MP7 Patch 0 ( | TcVis 11.4
Development: C (ITK), .NET, Tcl/Tk Testing: NX12.0 | AWC 3.4 Preparing: NX12.0

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