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?
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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
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.
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.
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