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It's been a while and I (or someone else) may have posted these before. If so, feel free to kick this to the curb, Leather. if not, enjoy. I really like this calculator. I've used it before. If trying to notch a compound joint, but print two of the needed angles and overlap the templates. Anyway, enjoy:

http://www.blocklayer.com/pipe-notchingeng.aspx

Awesome! Thanks for posting this!