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Issue with merging parts - Bug or Misunderstanding?

jeremy_templejeremy_temple Member Posts: 2
I love Onshape as it's a fairly simple CAD software I can use on anything for free, but I've been having this issue occasionally that really bugs me. Sometimes, when creating multiple sections from the same sketch which I intend to add/merge together, I get an error and end up having to add them as separate parts. They can't be merged with a boolean afterwards, either. Am I missing something, or is this just a bug in the software? Thanks for any guidance

Example of issue:
 

Answers

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    nick_papageorge073nick_papageorge073 Member, csevp Posts: 744 PRO
    From the screenshot it looks like it’s probably non-manifold geometry. It means surfaces come to a sharp edge/point in a nutshell. No cad system can do that, it’s not mathematical possible. 

    Go through your sketch and re-do it and it should work. 
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    S1monS1mon Member Posts: 2,562 PRO
    @nick_papageorge073

    No Parasolid based CAD system can do it. The Granite kernel that Creo uses can handle these types of non-manifold situations, but they are only so useful as they don't represent something which is manufacturable.
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    rick_randallrick_randall Member Posts: 153 ✭✭✭
    edited June 23
    I believe it's the inner circle that's giving you the error, you might try changing it to a construction line (highlight and type "Q"), or deleting it (it's function is not really apparent to me)
    Hope this helps, good luck

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