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Start of sweep along helix
gauthier_östervall
Posts: 99 ✭✭
I have a rectangle in a sketch, and an helix to sweep along.
When the helix has three rotations, it works as I expect:
You can see the sketch, and that the part starts there and goes on following the helix.
If I modify the helix to make four turns, the start position of the part is *above* the sketch:
What is going on? How can I keep in control of the sweep's start position?
Here is the model: https://cad.onshape.com/documents/67fb028a75ce82f860b6a0af/w/67a2efe8ba077c46e15dd6af/e/3523f2ce85349cc194eefe20
When the helix has three rotations, it works as I expect:
You can see the sketch, and that the part starts there and goes on following the helix.
If I modify the helix to make four turns, the start position of the part is *above* the sketch:
What is going on? How can I keep in control of the sweep's start position?
Here is the model: https://cad.onshape.com/documents/67fb028a75ce82f860b6a0af/w/67a2efe8ba077c46e15dd6af/e/3523f2ce85349cc194eefe20
0
Best Answer
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@gauthier_östervall
I guess the reasoning is —A profile does not have to be placed at one of the ends of the path. It can be anywhere along a sweep.
Apparently, the program keeps it simple in making the sweep according to the closest part of the profile to the path
1
Answers
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Interesting - I tried to constrain it a few different ways with no luck - seems to not like a cylinder height below 28.25mm.... can you change the helix and path to actually touch - that will typically perform better0
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With the face not touching (I guess you meant the *face* and the path), but connected to the path with a line, the sweep starts to behave.
Weird...0 -
@gauthier_östervallIs this the way you were hoping it would work ?Because if I’m understanding you, it seems like it’s working OK on my mobile iPhone app
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@steve_shubin Sorry, I modified the hole profile to test Jenny's suggestion. Document now showing the defect again.0
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See below0
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@steve_shubin Sorry, I don't get it. The unexpected move of the start does not change shape the part, only it's placement. If it isn't self-intersecting by moving it one turn up, it wouldn't be either if starting at the right place?0
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@gauthier_östervall
looks like it has to do with what part of the profile is closest to any part of the helix
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Yeah, I think you got it! This is not the behavior I expect.1
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@gauthier_östervall
I guess the reasoning is —A profile does not have to be placed at one of the ends of the path. It can be anywhere along a sweep.
Apparently, the program keeps it simple in making the sweep according to the closest part of the profile to the path
1
