The following Tech Tip was provided by Eddy Finaro, Siemens PLM Software.
We think you will find this helpful information about the Containment Loops selection found within the new Variable Axis Guiding Curves operation in NX 12 for manufacturing.
Containment loops in essence is simple to use yet pretty powerful. Here are some tips about it:
The entire Guiding Curves operation expects contact space data, meaning the containment loops, same as the guiding curves must be projected to the cut area.
The pattern is created across the entire cut area (regardless of the containment loops) and later trimmed to the containment loops.
You can see how the step-overs are following the containment even if it has corners.
The system support one or more loops. It knows how to nest them:
Containment loops must not lie partially / entirely outside the cut area!
The trimming will happen as the contact point on the tool is touching it which allows to use the same curve to do complementary operation with different tool diameters and orientations (3+2X / 5X):
In fact, if you do not manually select Containment Loops, the system will automatically identify them on the edges of the cut area. In rare cases interior gaps between sheet bodies may be detected as Containment Loops which cause unexpected interruptions in the toolpath. In this case manual selection of the exterior loop may resolve this problem.
Tip: When you select Guiding Curves or Containment Loops, a pick with single curve selection will overshoot the section you really need.
If you activate the ‘Stop at Intersections,’ the same pick will end with a contained curve --
-- such that you can get the containment you want with less geometry creation.
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