Settings for a smooth sweep?

Hi folks,

A simple solution to this problem I am sure...

I am using Wildfire 5.0 and for the life of me can't get a sweep to display a smoothly curved rod.  I need a 1.41 mm rod that is bent in a half circle.  This is what I get displayed:

Ihave used the sweep tool to create this.  The actual part appears to be the correct dimensions, but the display of it creates these steps.

Any advice on how to get this displaying correctly will be greatly appreciated.

Thanks,

Rowan