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Angle between splines in separate sketches

lance_leasurelance_leasure Member Posts: 10
My apologies if this has been asked and answered already. I've searched and found nothing. Here is my document: https://cad.onshape.com/documents/5f09ba4dd3065333bfc058de/w/706087104efa0380a74fa40a/e/defe5237dd12b30227b83986

I'm still quite new to CAD and Onshape and am working on Step 4 of the Complex surface features/Exercise: Helmet. I've tried every way that I can think to follow the instructions to achieve the 65deg dimension in the illustration and also referenced in the "Hint," but I cannot achieve an angle measurement. Any help here would be greatly appreciated. 

The following image is from the exercise. I've highlighted the target angle and the hint referenced above.



The following is my sketch in its current state. I've highlighted the two handles I *think* I'm supposed to be measuring between. 

Best Answers

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    steve_shubinsteve_shubin Member Posts: 1,070 ✭✭✭✭
    Answer ✓
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    steve_shubinsteve_shubin Member Posts: 1,070 ✭✭✭✭
    edited May 2023 Answer ✓
    … SO not intuitive

    An angular dimension cannot be made off of the spline

    So in the GIF in my post above, I show a work around on how to make a line coincident to that spline, in order to make that angular dimension.

    But I’ll agree — not the most straightforward way of doing it, as for one thing, the line had to be FIXED to make it work. Seems coincident should’ve been enough

    But there is a way that I think is intuitive.

    Now the program was looking for something straight or planar to get that ANGULAR dimension off of

    And although the spline IN PROFILE (Right View) appears to be straight, when you look at it NORMAL TO the plane, it’s a curve.

    But even if you made a spline as straight as can be, you’re just not going to be able to get an angular dimension off of it. Splines don’t work with ANGULAR dimensions — at least not on my iPhone

    But — there’s something related to that spline in Sketch 6 that is straight or planar. And that’s the plane itself that the sketch was drawn on

    So in the GIF below, I use that plane in order to dimension off of, to get the 65°.



Answers

  • Options
    steve_shubinsteve_shubin Member Posts: 1,070 ✭✭✭✭
    Answer ✓
  • Options
    lance_leasurelance_leasure Member Posts: 10
    Thank you so much! Ugh. SO not intuitive, but given the time I've spent struggling with this, I won't forget it! :)
  • Options
    steve_shubinsteve_shubin Member Posts: 1,070 ✭✭✭✭
    edited May 2023 Answer ✓
    … SO not intuitive

    An angular dimension cannot be made off of the spline

    So in the GIF in my post above, I show a work around on how to make a line coincident to that spline, in order to make that angular dimension.

    But I’ll agree — not the most straightforward way of doing it, as for one thing, the line had to be FIXED to make it work. Seems coincident should’ve been enough

    But there is a way that I think is intuitive.

    Now the program was looking for something straight or planar to get that ANGULAR dimension off of

    And although the spline IN PROFILE (Right View) appears to be straight, when you look at it NORMAL TO the plane, it’s a curve.

    But even if you made a spline as straight as can be, you’re just not going to be able to get an angular dimension off of it. Splines don’t work with ANGULAR dimensions — at least not on my iPhone

    But — there’s something related to that spline in Sketch 6 that is straight or planar. And that’s the plane itself that the sketch was drawn on

    So in the GIF below, I use that plane in order to dimension off of, to get the 65°.



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