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Tip: Projecting Sketches

andrew_troupandrew_troup Member, Mentor Posts: 1,584 ✭✭✭✭
When "Use (Project/Convert)" is chosen to project from Sketch 1 onto Sketch 2 in cases where the two sketch planes are not exactly parallel, the geometry is projected normal to Sketch 2.

Occasionally, this does not serve the desired purpose. In cases where you need the geometry projected normal to sketch 1, one way to proceed is this:

Extrude Sketch 1 as a surface, specifying  "Up to Surface" and choosing Plane 2 as that surface. Now select the end of the extruded surface and choose "Use", to convert the geometry to Sketch 2.

An example where a variation of this technique is handy is in copying a guide curve across a loft, when the guide curve is on a plane which is not parallel to the midplane of the loft. 

Obviously it will not work to project straight from one tilted plane to the oppositely tilted plane.

But less obviously, it will not even work to project to the midplane, and then to the opposite plane, UNLESS the first projection is done normal to the plane of origin, and the second relative to the destination plane....
OR vice versa.

Example model:
https://cad.onshape.com/documents/da23d67a50174f50a1786062/w/492e406ffc7c4562a84f35e9/e/0245eb45dcaf4a7f97c16684

This method was touched on in another discussion, but I thought it might be useful to explain it properly for a broader audience.
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