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Loft problem - aerofoil shape + offset sketch
lloyd_courtney
Member Posts: 4 ✭
I'm trying to create a "formwork" for an aerofoil shape to see if I can heat+shape a foam sheet. The aerofoil shape was created using the Profile Generator feature.
I've created a test aerofoil as the Pattern and am trying to use an offset sketch to generate a matching shape for the formwork (offset at 5mm)
The inner profile seems to always be in error though - am I missing something?
In the example here I tried to create a second offset (an offset to the first offset!) in case there was an issue with the aerofoil shape, but in both cases the inner profile shows an error
Best Answer
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S1mon
Member Posts: 3,445 PRO
I would highly recommend not using profile generator. It creates pretty lumpy curves which are not going to help you. Instead use HAVF: https://forum.onshape.com/discussion/24730/new-custom-feature-havf-profiles-standard-airfoil-profiles
Also offsets of offsets are often crappy curves. You're better off offsetting from the original and doing the math to get the result you want.Are you trying to loft the face which is defined by the inner and outer profiles at the same time? Loft can't handle faces with holes in them. You would need to do two lofts.
Simon Gatrall | Staff Mechanical Engineer | Carbon, Inc.
1
Answers
If you share the document URL, someone will be able to help you out. Be sure you're not lofting regions or profiles with inner loops. That's not allowed.
I would highly recommend not using profile generator. It creates pretty lumpy curves which are not going to help you. Instead use HAVF: https://forum.onshape.com/discussion/24730/new-custom-feature-havf-profiles-standard-airfoil-profiles
Also offsets of offsets are often crappy curves. You're better off offsetting from the original and doing the math to get the result you want.
Are you trying to loft the face which is defined by the inner and outer profiles at the same time? Loft can't handle faces with holes in them. You would need to do two lofts.
Simon Gatrall | Staff Mechanical Engineer | Carbon, Inc.