Nice work - and less than half an hour from post to post!
And for the smaller wheel its just theta-90 as opposed to 90-theta for the 
the large wheel.
DLM

"Slime" <fak### [at] emailaddress> wrote in message 
news:4248890f$1@news.povray.org...
> In the attached picture, theta = acos((r2-r1)/d). The angle you're looking
> for might be the complement of theta = asin((r2-r1)/d).
>
> - Slime
> [ http://www.slimeland.com/ ]
>
>
>

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