Greetings all you OpenSCAD experts;

I had no trouble making a ring with this code:

h  = 5.25 ;
r1 = ( 73.6/2.000000 ) ;
r2 = ( r1 + 2.6000 ) ;
difference() {
cylinder( h , r2 , r2 , $fn = 180 , center = true ) ; 
cylinder( h , r1 , r1 , $fn = 180 , center = true ) ;
}

But how do I generate another 2.5mm radius cylinder but only for the 
stated degrees, like a half cylinder?

The tut I'm following doesn't seem to address this.

Thanks.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/gene>


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