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Why isn't the edge of my frame parallel to my sketch?
robert_isacksen118
Member Posts: 4 ✭
I selected two points to create a frame between, and limited the ends of the frame to the planes that the sketches are on. I would expect the edge of the frame to be parallel to the sketch since it's a square tube, but it's at a slight angle instead. Am I using the tool incorrectly? The picture below shows the frame relative to sketch 1 in the document linked.
https://cad.onshape.com/documents/0ee68314a5e72e3c3333753d/w/e5fb7983603918787972541e/e/2a7687c95c9d3df7c2b2aa9d
Best Answer
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Derek_Van_Allen_BD
Member Posts: 698 PRO
This is because your frame is tilted towards the center of whatever the object is you're pointing it towards in 3 dimensions. With square box tube your 90 degree faces will only ever align to one of the outside faces of your assembly when tilted out of plane on a complex miter like this. If you forced the two sides to be coincident to the edges of your sketch you would no longer have square box tube, but parallelogram box tube. It's a geometry thing.
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Answers
This is because your frame is tilted towards the center of whatever the object is you're pointing it towards in 3 dimensions. With square box tube your 90 degree faces will only ever align to one of the outside faces of your assembly when tilted out of plane on a complex miter like this. If you forced the two sides to be coincident to the edges of your sketch you would no longer have square box tube, but parallelogram box tube. It's a geometry thing.
Derek Van Allen | Engineering Consultant | Meddler