Arc segments and smooth curves. How to get smooth.

[GeneDavis]

I need make a 3D solid that represents a curved (the curve in plan view) framing member.  A curved rim joist. 

 

I cannot figure out a way to get the arcs smooth and not segmented.  Or rather, I cannot see a way to make the segments smaller.  I drew two concentric circles to get the 1.875 inch thickness I need, and the circles had nice smooth arcs when trimmed with CAD and still were smooth when I closed things to make the polyline needed, but when converting to a solid, BOOM, segmented so it does note even look curved the segments are so large.

 

Where in the dialog can I set segmentation so it lasts through the process of conversion to a solid?

[DBCooper]

Try this:

- select one of the arcs 

- open the 3d solid dialog

- go to the "selected arc" panel

- uncheck "automatic facet angle"

- set the angle to a smaller value, like 1 degree

 

[MarkMc]

OR

Before closing polyline select curve, convert curve to polyline, select number of segments, repeat on second line...close pline and conver.