AMuzi wrote:

http://www.yellowjersey.org/gth8.jpg

Also, how does one know how much to file away?
Like if you have one tube that has diameter A,
and another has diameter B, and A B, and you
want the second tube to be at an angle X from
the first?

If we return to the lathe guys they have
a small thing with rods that can be pushed back
and forth to form a pattern, perhaps something
like that can be used to do a template if it is
difficult to compute?

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underground experts united
http://user.it.uu.se/~embe8573