This could be done quite well with the crackle normal with a high frequency.
However, the crackle pattern in official POV will always give angular, rather
than circular features. I think the modified crackle pattern in the Superpatch
could produce almost exactly what you are looking for - if you're willing to
give it a try.
And whatever method you use, expect aliasing galore! My current background image
also imitates the milled metal effect. While I actually wanted the interference
patterns, it is probably not desirable in your case. Plus the render time was
HUGE.

Margus

"John M. Dlugosz" wrote:
> 
> I've seen metal plates and surfaces that are covered with polished circles,
> which I assume is due to being formed by a vertical milling machine.
> 
> Any idea how I can do that with a texture in POV?
> 
> --John

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