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Is there a simpler way to model this circular wave geometry?
daniel_bailey
Member Posts: 7 ✭
I have modelled a wavy track designed to be a surface on which a cam rides, and is pushed up and down.
See the part in this document:
https://cad.onshape.com/documents/7123abbf4f9c97ed7b66a0cc/w/73e8d2b6da1ef1e5bdadd74a/e/62138605073e04d49c30108c
Currently, to create this part, I have to...
- create a pair of curves that match the top of the waves on the inside and outside of the tube on which they sit
- loft these curves down to circles on the base of the tube
- split the resulting surfaces into pairs of surfaces and draw extra lines between them
- fill the two areas surrounded by these curves that now define the top surfaces
- then split, add lines and fill again for the bottom surface
I know the last set of [split, draw lines, fill] could be avoided as that's just a flat disc, which can be modelled in a simpler way, but this felt cleaner and more consistent.
However, I still feel like this a significant number of operations.
I need to make a few of these parts, and wanted to know if there was an easier and simpler way to model them?
(I'm tempted to write a featurescript to generate them, but would be happy to find a simpler way to do it)
Thanks.
See the part in this document:
https://cad.onshape.com/documents/7123abbf4f9c97ed7b66a0cc/w/73e8d2b6da1ef1e5bdadd74a/e/62138605073e04d49c30108c
Currently, to create this part, I have to...
- create a pair of curves that match the top of the waves on the inside and outside of the tube on which they sit
- loft these curves down to circles on the base of the tube
- split the resulting surfaces into pairs of surfaces and draw extra lines between them
- fill the two areas surrounded by these curves that now define the top surfaces
- then split, add lines and fill again for the bottom surface
I know the last set of [split, draw lines, fill] could be avoided as that's just a flat disc, which can be modelled in a simpler way, but this felt cleaner and more consistent.
However, I still feel like this a significant number of operations.
I need to make a few of these parts, and wanted to know if there was an easier and simpler way to model them?
(I'm tempted to write a featurescript to generate them, but would be happy to find a simpler way to do it)
Thanks.
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Comments
I think there's a simpler way. See what you think of this:
https://cad.onshape.com/documents/73c5480a400eb4a6fc7470d0/w/2e12e7050bff8e2be7e7209a/e/b709d76477291220c8e5ff73
Take advantage of symmetry to greatly simplify the model.
Welcome to the Forum!
Romeo
Your method also has the advantage of making it easier to change the number of hills on the part (this is handy as the other similar parts I want have different number of hills)
https://cad.onshape.com/documents/f5e761d9f30903b94bc9002d/w/1b3939c9c89ab4960668f4a7/e/af0256272776577dd73d6a04
Here’s a 6 step (Features) method
https://cad.onshape.com/documents/e6b39c5bbe396276e46da7ff/w/d096101996ef685af4aea8f3/e/0de2512de1679398773ff6ef
@mahir
Those are amazing!
@daniel_bailey If you use these elegant solutions, don't forget that the diameter of the circle needs to be set to #Diameter, or the size configuration doesn't work:
@steve_shubin I like your approach too, though it's not clear to me how it can be flexible - can you add configurations for different numbers of peaks / different height, etc?.
Ah - I noticed that in @mahir version I couldn't create the Mate Connector (for the revolute) in the assembly on the fly---and that explains why. But the tangent mate still works
https://cad.onshape.com/documents/9c63b1e34811859f21c4f78d/w/485e3591dfabec7901025baf/e/e4f1e9b4a1b184f126db6a72
OK — here’s an easily modifiable way for iPhone users to do it. And it’s also a fairly straight forward way of setting it up. Nothing too fancy being done here.
@romeograham , I’m guessing you could get this method to work using configurations — but I only use an iPhone when doing Onshape. As such, I’ve never set up a config table
I haven’t taken the time yet to take it into assembly. Maybe later today I’ll play around with that. But I did use Create Selection and Tangent under that to make sure the entire top surface was smooth and tangent all the way around
I didn’t take time to set up a path between the inner and outer edges. I just checked it along the inner edge and outer edge. This GIF shows it running along the outer