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Sweep not working correctly on screw? Using Edge of helix and Equilat Triangle

Guys spent a few hours so far trying to use the swep feature to create the threading on a screw.  I follow tutorial step by step, and this still dosen't work anyhelp? 
here's what I've done:
1. Created the screw
2. Map the helix on the surface plane of the screw extrusion
3. Created an equilateral triangle and created a pierce/coincident contrained. 
4. Did a sweep on the triangle's surfface and the edge of helix screw.
 Here's my object link: https://cad.onshape.com/documents/3232d50a8f0c16088b22e7e6/w/a60f1694ae07fbad9a8061ef/e/3327ccd028dc524a875f337e
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Answers

  • bradley_saulnbradley_sauln Moderator, Onshape Employees, Developers Posts: 271
    edited December 2017


    Hovering over the failed feature to see the error, we get the following message: "Result of sweep intersects itself, adjust path or profile..."

    If you look at your profile in Sketch 3 you will see that the bottom vertex is set to where the helix starts and the top vertex is touching the next loop in the helix. You need to adjust your profile size to be at least, but ideally less than, half the distance between each loop in the helix.

    It looks like your helix pitch is set to .25mm which is the same as your profile edge length. If we adjust the profile edge length to say .1mm you will get the following result: https://cad.onshape.com/documents/7d82d2903e105e4f2ac9825e/w/384b131fe24f94be3505f9dc/e/7b6b22a577c94e352b3e9c1e
    Engineer | Adventurer | Tinkerer
    Twitter: @bradleysauln


  • Jake_RosenfeldJake_Rosenfeld Moderator, Onshape Employees, Developers Posts: 1,381
    Additionally, you can check out the "Thread creator" custom feature (and the "Start using custom features" video if you're unfamiliar with custom features) on this page:
    https://www.onshape.com/featurescript

    This will do all the heavy lifting for you!
    Jake Rosenfeld - Modeling Team
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