Fun times with the Loft feature...

tom_auger

I've been lofting in 3D software for two decades and it's always a treat. Sadly, Onshape is no different.

Here's a good one: lofting from a rectangular sketch to a cross-shaped one. Possible? I tried to cheat by carefully placing 8 points on my "rectangle" in a very specific order, and then constraining pairs of points to each of the 4 "corners" of my rectangle, and carefully creating my cross sketch using 8 points as well (well 8 points + 4 center points as I was using the arc tool).

The results are exactly the same as if I had used 4 points on the rectangle, so I'm guessing that Onshape is too clever for me (it doesn't take much). I tried matching vertices but that had no (positive) effect. If anyone can figure out how to loft these two shapes please post your doc!

mahir

Is this closer to what you're trying to do? I'm not sure what your intent is.

https://cad.onshape.com/documents/57acdfaae4b005c413ed9b6f/w/3fd585a46d3af1b3ba413c53/e/ba9399339fd065915be3680e

mahir

You needed more points and/or line segments. You had 8, but what I did requires 12. This was so I could map the corners to the arc midpoints. I didn't have to match vertices. I think Onshape already picks the path of least resistance (shortest point-to-point mapping), so vertex matching wasn't necessary. Similarly, the order in which you create the points doesn't seem to matter. Feel free to click the link above and make a copy of the part studio. That way you can poke around.

mahir

Is this closer to what you're trying to do? I'm not sure what your intent is.

https://cad.onshape.com/documents/57acdfaae4b005c413ed9b6f/w/3fd585a46d3af1b3ba413c53/e/ba9399339fd065915be3680e

tom_auger

mahir said:

Is this closer to what you're trying to do? I'm not sure what your intent is.

Yes! Did you need to use any guides or match vertex to make it work? Or did you have to pay particular attention to the order in which you created the points on each sketch?

mahir

You needed more points and/or line segments. You had 8, but what I did requires 12. This was so I could map the corners to the arc midpoints. I didn't have to match vertices. I think Onshape already picks the path of least resistance (shortest point-to-point mapping), so vertex matching wasn't necessary. Similarly, the order in which you create the points doesn't seem to matter. Feel free to click the link above and make a copy of the part studio. That way you can poke around.