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Closed shape does not produce face when offset is used

wito_roz137wito_roz137 Member Posts: 5 ✭✭
https://cad.onshape.com/documents/5a79cd2f70dfdd34ab1bafcb/w/cf901ba41e8906d7a8939ce4/e/356c3b1f961f73023b6a6ab9

in sketch 3 if I use an offset of 8mm closed shape is turned into a selectable face, but if the offset is 7mm it does not. It also works for various other offset values but not for 7mm. Is this a bug or am I missing something?
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    S1monS1mon Member Posts: 2,365 PRO
    A quick way to diagnose these issues is to throw in a line which overlaps the shape to help find the gap. In this case it's really subtle and very twitchy.



    I extended both the vertical line and the offset curve and let the system find the intersection. No matter how I tried aligning the endpoints to the other curve or endpoint, it would break. This arrangement is robust through a range of values for the "7" dimension. It shouldn't really be necessary, but offset curves are fussy.



    https://cad.onshape.com/documents/f7119b87f6cc00fd5093cbde/w/9237c2d125ae189ef5850296/e/186d3dbdf173cc4a950560bd
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    wito_roz137wito_roz137 Member Posts: 5 ✭✭
    Thank you. That's very helpful. 

    Things like this when you do everything correctly and follow a workflow that should work but doesn't are really annoying in Onshape. If there is a coincident constraint applied to 2 vertices they should be connected! We shouldn't need to find workarounds...

    This issue of coincident constraint not closing the loop never happened to me before today, but today it happened twice in two different cases. Maybe this bug appeared recently? Maybe it was introduced in one of the updates? 
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