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Revolve feature

geoff_joseygeoff_josey Member Posts: 65 ✭✭
I am a Onshape newbie but have spent quite a bit of time on webinars etc. I still get stuck on really basic functions and so have gone back to really basic actions.
eg. Revolve. I draw a rectangle and then try to revolve it eg. thro 30 degrees. It comes up red and says" did not regenerate properly" I understand the problem generating a sphere from a circle - use a semicircle.  I guess you could generate the segment by sketching it and using extrude, but I want to understand why I have the problem with revolve Thanks

Comments

  • NeilCookeNeilCooke Moderator, Onshape Employees Posts: 5,253
    Sounds like the profile is self-intersecting when being revolved. Always with this feature, only draw half of the profile section.  
    Senior Director, Technical Services, EMEAI
  • geoff_joseygeoff_josey Member Posts: 65 ✭✭
    Thanks Neil. I think you are correct as i have now managed to revolve a circle thro 180 degrees Still having problems though. Can you select the origin as an axis of rotation ? I cannot seem to use it. I also have a problem if I draw a line outside the part to use as the
    rotation axis.
  • Jake_RosenfeldJake_Rosenfeld Moderator, Onshape Employees, Developers Posts: 1,646
    Hi @geoff_josey

    Here is an example of a sphere and a rotation of a sketch with the axis outside of the part:
    https://cad.onshape.com/documents/cc4d4b2cf804d1baa357a53e/w/a7e3d75321dd496a271e4dc1/e/e56ba3433f3c5176d7610b9d

    Can you post a link for the document you are having trouble in? It may help to see what you are trying to do.

    The origin cannot be used as an axis of rotation because it is not a line in space. There are many ways to rotate about the origin because it is just a point.  (For example, a selection of the origin could be asking to rotate "over" the origin or "around the back"; there's no way to tell without a full line.)
    Jake Rosenfeld - Modeling Team
  • geoff_joseygeoff_josey Member Posts: 65 ✭✭
    Hi Jake, Thanks for your comments. 
    I am still struggling. Take a look at Public doc Test3 I have created a line as the revolve axis. Just trying to revolve the rectangle thro 180 deg. Why does the revolve command come up as red and fail ? Is the selection sequence critical ? ie rotate - select face the axix ?
  • NeilCookeNeilCooke Moderator, Onshape Employees Posts: 5,253
    Hi @geoff_josey please provide a link - a search for "test3" gives thousands of results.

    Senior Director, Technical Services, EMEAI
  • NeilCookeNeilCooke Moderator, Onshape Employees Posts: 5,253
    Works fine for me: 


    Senior Director, Technical Services, EMEAI
  • geoff_joseygeoff_josey Member Posts: 65 ✭✭
    OK now thanks. I had the idea that the "red"highlighting indicated a problem rather than an incomplete sequence. Thanks
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