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whats going on with shrinkwrap?

4 REPLIES 4
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Message 1 of 5
stephengibson76
437 Views, 4 Replies

whats going on with shrinkwrap?

I need to find the displacement of a hollow part so thought shrinkwrap would be a good idea but it doesnt work as i expected, this is my workflow

create a cube 10mm^3
shell it 2mm wall thk
add to an assembly and shrinkwrap, solids leave the shell there which i want to remove, (simplification, remove geometry by visability, parts and faces is greyed out with solids), so i create it as a single composite feature, (removes the shell)
Check volume of new part and its still the shelled volume, so i sculpt the part to turn back into a solid.
check volume of new part again a 10mm^3 part has a volume of 1784mm^3????????

What am i doing wrong?
Stephen Gibson



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4 REPLIES 4
Message 2 of 5

ok so it gives me the actual volume plus the volume from the original part... 1000+784. how do I remove this associativity with the original part
Stephen Gibson



View stephen gibson's profile on LinkedIn


Message 3 of 5

ok i have answered my own question, click the break link option when shrinkwrapping the assembly and all works fine
Stephen Gibson



View stephen gibson's profile on LinkedIn


Message 4 of 5

Would an alternative to breaking the link be per below:
1. Start new file- Assembly.
2. Place parent assembly of shrink-wrapped file.
3. Place shrink-wrapped file, co-incident with parent.
4. Save.
5. Start new Part file.
6. Place derived instance of your recently created assy.
7. Set the Original assy instance to Subtractive.
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Message 5 of 5

This is as designed so that although the assembly has a substitute/shrinkwrap it still maintains all of the materials & mechanical properties of the original assembly. If it didn't do this in most cases it would make using this feature very awkward.

Scott Moyse
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Design & Manufacturing Technical Services Manager at Cadpro New Zealand

Co-founder of the Grumpy Sloth full aluminium billet mechanical keyboard project

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