loft issue with 3d spline

wei_xun

Hi community,

I am trying to loft between a circle and an eclipse using a 3d spline as a guide. the feature wouldn't solve because "all guides should intersect each profile boundary". but i believe both ends of the guide do intersect the profiles. 

I also notice that the center of the eclipse is a black dot while the center of the circle is white. does anyone know what the colors indicate?

https://cad.onshape.com/documents/ed7b6b4cb70ca79b5d89f3b6/w/5589382c744ebbe46d072e06/e/fc88f7c462e649d4b5dff23a

john_mcclary

https://cad.onshape.com/documents/12b29b61b01aafd230de83a5/w/c519756b81e50e61903c8724/e/a944aa02641495f8cd0d821e
See above

The white dot versus the black dot:
White dot is a sketched "Point"
while the black dots are "End points" or "Center points" of other sketch geometry. In this case, the black dot was the center point of the ellipse, and the white dot was a sketched point that was placed on top of the circle's center point. (I just deleted this point by window selecting and  deleting in sketch 16, as it was not being used)

You had a Plane 13 defined as an offset from the front plane.
This will not be as accurate as Plane-Point. because of tolerances.

once you fix that,
then make sure you are following the "path" instead of "guides and continuity"
also add some section counts to help smooth out the loft

john_mcclary

https://cad.onshape.com/documents/12b29b61b01aafd230de83a5/w/c519756b81e50e61903c8724/e/a944aa02641495f8cd0d821e
See above

The white dot versus the black dot:
White dot is a sketched "Point"
while the black dots are "End points" or "Center points" of other sketch geometry. In this case, the black dot was the center point of the ellipse, and the white dot was a sketched point that was placed on top of the circle's center point. (I just deleted this point by window selecting and  deleting in sketch 16, as it was not being used)

You had a Plane 13 defined as an offset from the front plane.
This will not be as accurate as Plane-Point. because of tolerances.

once you fix that,
then make sure you are following the "path" instead of "guides and continuity"
also add some section counts to help smooth out the loft

wei_xun

Thank you for the detailed response John! I went ahead and fixed the 2 issues your raised, but my result show a much thinner transition near the middle of the loft. How did you make yours more thick?

john_mcclary

I added more sections (those purple rings), 30 seemed to be about right