Welcome to the Onshape forum! Ask questions and join in the discussions about everything Onshape.

First time visiting? Here are some places to start:
  1. Looking for a certain topic? Check out the categories filter or use Search (upper right).
  2. Need support? Ask a question to our Community Support category.
  3. Please submit support tickets for bugs but you can request improvements in the Product Feedback category.
  4. Be respectful, on topic and if you see a problem, Flag it.

If you would like to contact our Community Manager personally, feel free to send a private message or an email.


WHy does rib fail to generate when one end is the edge of a curve

andrew_carnallandrew_carnall Member Posts: 2 ✭✭
edited April 2018 in Community Support
I have tried to create a rib and if the end is coincident with the edge of a curve it fails to generate, and I would like to understand why.  In the linked document I don't get why the rib through a sketch and extrusion works and the rib feature doesn't.

Any pointers?



  • Options
    bruce_williamsbruce_williams Member, Developers Posts: 842 PRO
    with the rib sketch coincident, the edges of rib would extend above the part so it fails. by moving the sketch down as shown below, the two edges of the rib intersect the main part.  With your extruded rib you fixed the condition by 'clipping the rib to below the top.   You could add extra height to the main part and then trim after creating ribs.

  • Options
    andrew_carnallandrew_carnall Member Posts: 2 ✭✭
    Thanks for the answer, as far as it goes that makes sense - but if the rib sketch extends past the curved face it simply extrudes a rectangle down it simply extrudes a rectangle to the top face - and it can cope with this rib crossing onto the curves face:

    or if the rib profile ends in line with the corner  it again extrudes a rectangular profile to the main part (construction line is perpendicular to the rib profile and co-incident with the corner of the part):

    It only fails if the rib profile line is co-incident.

    I can see the logic for why it fails, I just don't see why the original design couldn't be generated as the extreme case of the either of those results? 

Sign In or Register to comment.