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Vertically Symmetric Circular Sketch Pattern

mike_aizatsky
mike_aizatsky Member Posts: 3 ✭
in Community Support
I need to create 5 square holes on a circular arc. They catch is the middle one has to be on the vertical axis. What is the best way to create such a construct so that I can adjust arc angle and radius later?
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Best Answers

  • lemon1324
    lemon1324 Member, Developers Posts: 230 EDU
    Answer ✓
    How's this?

    Sketch a square, circular pattern three elements to the right.  Then mirror the two off-center squares into the left side.  The mirror updates as expected if you later change the radius/arc angle.
    Arul Suresh
    PhD, Mechanical Engineering, Stanford University
  • lemon1324
    lemon1324 Member, Developers Posts: 230 EDU
    Answer ✓
    The mirror method is robust to changing the number in the pattern, but if the number stays constant, you can also do this, which is a bit easier:

    Start with a square at the left edge, remove the horizontal constraint, and constrain it to be oriented with respect to the center. Then pattern 5 elements, and constrain the midpoint of the center element to be vertical to the origin.
    Arul Suresh
    PhD, Mechanical Engineering, Stanford University

Answers

  • daniel_splawski
    daniel_splawski Member Posts: 66 ✭✭
    edited August 2016
    If they're all equally spaced you could create the square on the vertical axis and then use the circular pattern tool to create two more squares in the clockwise direction.  Then you could mirror the two created squares along the vertical axis for a total of 5.  I've included an example below. 

    https://cad.onshape.com/documents/a02b007b2f2b1f638cbf6578/w/2a8a170d43d9a83fe3aa983c/e/48908bfb5856d1ccd4834cf9
  • lemon1324
    lemon1324 Member, Developers Posts: 230 EDU
    Answer ✓
    How's this?

    Sketch a square, circular pattern three elements to the right.  Then mirror the two off-center squares into the left side.  The mirror updates as expected if you later change the radius/arc angle.
    Arul Suresh
    PhD, Mechanical Engineering, Stanford University
  • lemon1324
    lemon1324 Member, Developers Posts: 230 EDU
    Answer ✓
    The mirror method is robust to changing the number in the pattern, but if the number stays constant, you can also do this, which is a bit easier:

    Start with a square at the left edge, remove the horizontal constraint, and constrain it to be oriented with respect to the center. Then pattern 5 elements, and constrain the midpoint of the center element to be vertical to the origin.
    Arul Suresh
    PhD, Mechanical Engineering, Stanford University
  • daniel_splawski
    daniel_splawski Member Posts: 66 ✭✭
    I think @lemon1324 's second method is the best.  

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