This is just a display artifact. Since this part is long and skinny, you need to crank up the display quality for it to display the curved faces properly. Go to Tools, Options, Document Properties tab, then Display Quality, and crank up the shaded resolution slider. See this help topic:
I hope that helps,
Bill McConnell wrote:
....I have 20 years experience of 2D ACAD experience.
My instructor can not figure out why ....
Think of this like setting the AutoCAD variable(s) viewres (and facetres).
You can test that it was not converted to planar faces by trying to start a new 2D sketch on those faces. You cannot select the faces for 2D sketches as they are not planar.
I made the changes to the display quality and it greatly improved the results. However the swept boss arc profiles still do not match the the rail profile arcs.
Are you saying that the issue is strictly display resolution?
It does not matter to me if it does not display correctly on the monitor as long as when the eventual part is 3D printed it turns out properly.
I assume you mean when you zoom way, way in, they don't exactly match. This is just because of differences in the display resolutions/algorithms for displaying sketches and shaded faces/edges. I am not sure how you will get this to a 3D printer, but if you are using Save As STL, then there are yet different algorithms there that generate the triangles used for the 3D printer. You can get a preview of the triangles. Zoom into one end of the model, then go to Save As, set the type to STL and drag the dialog out of the way so you can see the end of the model. Then go to Options in the Save As dialog and turn on the Preview check box. I think you will find you will have to crank the Angle resolution slider way to the right to get enough triangles on those curved faces to give good resolution.
I hope this helps,