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machined crank slot I tryed a projected curve , it is similar to a ford typ a crank shaft.
svenolov_nystrom
OS Professional Posts: 68 PRO
Answers
Look through the various tabs in the two documents below
https://cad.onshape.com/documents/a4b977957f6c9823b3e6034d/w/65b9d18f8bfae13389db1e7a/e/f9aacfc089b3e7a96eec599e
Take a look at the 3 GIF's below.
The Wrap feature takes sketches with CLOSED shapes, meaning those shapes showing a gray area within a sketch, and places those closed shapes on the side of a cylinder, as if one were placing a decal on a window
Regarding the Wrap tool in general, you could certainly make things easier if your were to sketch shapes on a plane that is out in front of the cylinder. This will likely allow you to avoid having to play with the positioning within the Wrap dialog box, provided you position the shapes within the sketch.
When it comes to ANGLE, U SHIFT and V SHIFT, things can be a bit to grasp depending upon orientation. But once you get the general idea, it doesn’t take all that long to see what is what.
So in the GIF’s with the vertical cylinder centered on origin, and sketch on the front plane, Onshape will initially place this wrapped shape on the back side of your cylinder.
To remedy this, you can reposition the shape within the Wrap dialog. And provided you sketched at the end height you want, then you likely will only have to adjust the U SHIFT and ANGLE
At least in this case, U SHIFT is with regard to the CIRCUMFERENCE. So if the circumference of the cylinder was 6, and you wanted to get a mirror image with reference to the front plane, then you would set U shift to 3, which would rotate the shape half way around the cylinder to the front, and ANGLE to 180° for the mirror effect.
In the 3 GIF’s, I show how one end of the slot was placed in-line with the right plane.
If by chance, you did not want one end of the slot in-line with the Right Plane, then you would distance your closed shape within the sketch however many inches from that right plane.
In the below GIF, I first copy the circumference, then paste it into the U SHIFT field. Then divide it in half in order to rotate it half way around to the front. Then I enter 180° into the ANGLE field to have it mirror the position it was on the back
I moved the sketch from the front plane, to a plane I created just IN FRONT OF the cylinder.
In doing so, I eliminated having to do any positioning from within the Wrap dialog box,
as the shape now wraps onto the front of the part from the get-go.
Now you have an easier way of positioning the slot, and all done from within the sketch.
So the key is, to create your sketch on a plane in front of the cylinder you want to wrap.