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Closed path does not reliably create a face

val_schmidtval_schmidt Member Posts: 7 EDU
in Community Support
I've been following the tutorial and created this sketch:
https://cad.onshape.com/documents/58cd1b8f3db3a90f77dfee79/w/bc1a114e2d4c3a8151ff8c5b/e/b992bd9f829087ea71493017

But the lower left line tangent to the two circles is not creating a face (the area inside is not gray), and I cannot figure out why. 

Anyone know why?
Thanks,
Val

Best Answer

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    val_schmidtval_schmidt Member Posts: 7 EDU
    Answer ✓
    I fixed it. There was a horizontal line constraint on the line in question with the circle. I don't even know what that would mean, but it ultimately causes constraint conflicts through the drawing and didn't create a face in the interior region. Thanks for your help. Really helpful to have someone to bounce ideas off. Thanks!!!

Answers

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    konstantin_shiriazdanovkonstantin_shiriazdanov Member Posts: 1,221 ✭✭✭✭✭
    i just deleted those line, made a new one and it recognized the contour
  • Options
    val_schmidtval_schmidt Member Posts: 7 EDU
    edited March 2017
    I did this initially and just tried a second time. Although it is initially gray, when I add constraints that the line should be tangent to the two circles, the gray disappears. I'm not sure why.
  • Options
    konstantin_shiriazdanovkonstantin_shiriazdanov Member Posts: 1,221 ✭✭✭✭✭
    it's strange, try to open this sketch https://cad.onshape.com/documents/58cd2df276f6f70fe0a7f1e0/w/d69d2b3a6b7fca002ef790eb/e/52ae5e0fa63e398830c228bc

  • Options
    val_schmidtval_schmidt Member Posts: 7 EDU
    It's certainly gray in your sketch. But your sketch does not have the same constraints. I have to admit, I don't exactly understand the "coincident" constraint, which seems to come up a lot and exists for several of the lines that should be tangent in your sketch. I wonder if, either by design, or a bug, removing the coincident constraint and adding tangent constraints somehow "opens" what should be a closed path and a gray face.
  • Options
    val_schmidtval_schmidt Member Posts: 7 EDU
    Answer ✓
    I fixed it. There was a horizontal line constraint on the line in question with the circle. I don't even know what that would mean, but it ultimately causes constraint conflicts through the drawing and didn't create a face in the interior region. Thanks for your help. Really helpful to have someone to bounce ideas off. Thanks!!!
  • Options
    konstantin_shiriazdanovkonstantin_shiriazdanov Member Posts: 1,221 ✭✭✭✭✭
    edited March 2017
    @val_schmid "coinsident" in this case means that end point of line lies on a circle, I justd noticed that in your sketch you
    don't use it, so the cketch is not fully defined and the contour is not closed.
     


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