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WAVE Link Methodologies in Unigraphics.
Scope:
The scope of this document is to define the methodologies of WAVE geometry linking
in Unigraphics (Version NX 4 & above) & to explain their pros & cons.
Prerequisites:
This document assumes that the reader has basic understanding of the 3D modeling
philosophies in Unigraphics.
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What is WAVE Linking?
WAVE linking is an Unigraphics terminology which stands for What If Value
Engineering? . As the current trend focuses on value Engineering, this technology
emerged.
Lets take an example of a component which comes to the final shape after 3 levels of
manufacturing.1. Casting
2. Rough Machining
3. Finish Machining
The picture below represents the process flow.
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As represented in this picture, the Block in Casting (level 1) has a size of 6 X 2 X 1.
In the rough machining process (level 2), the top face of the block has been machined to reduce
the thickness by 0.25.
In the finish machining process (level 3), a hole is drilled on the machined face.
Each level is an UG part file. The advantage of having multiple part files, over dumpingall the feature of 3 levels to a single part file is as follows:
Better maintainability of the files which involves a lot of features.
Avoiding huge part files which slow down the processer.
Necessity to generate multiple drawings for each level.
How to maintain the synchronization between the Part files?
The change in the base dimensions made in Level 1 has to be cascaded to the
subsequent levels. This can be accomplished by Wave linking Level 1 to Level 2 & Level 2 to
Level 3.
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Step 4: Verifying the WAVE linked object in the destination part.
Linked body comingfrom the parent part file.
Detailed information ofthe Linked body.
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Step 2: Select the object which has to be WAVE linked.
The objects which can be WAVE linked are,
Solid Body
Sheet Body
Face
Edge
Datum Planes, Datum Axis
Curves
Sketches
Points
CSYS
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Step 4: Verifying the WAVE linked object in the destination part.
Linked body coming
from the parent part file.
Detailed information of
the Linked body.
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Pros & Cons of both the approaches:
WAVE link to Component
Pros
WAVE link always flows within the
assembly structure. Position / orientation of the WAVE
linked child is dependent on the position
of the parent.
Relatively easy to fix the brokenWAVE linked objects.
Cons
Provides a hard link in the Assembly
structure which enables less flexibilityin the Assembly structure.
Necessity to create the Assembly
structure before creating WAVE links.
WAVE link to Part
Pros
WAVE link need not flow within the
assembly structure. This enables tocreate inter part relationships across
assemblies.
Position / orientation of the WAVE
linked child is independent on the
position of the parent.
Provides a soft link in the Assembly
structure which enables more flexibility
in the Assembly structure.
Cons
Relatively complex to fix the broken
WAVE linked objects.
More possibility to create circular
references in case of large assemblies.
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Conclusion:
Both the methods illustrated, have their own Pros & Cons. So, its upto the
user to pick the appropriate methodology depending on the requirement.
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