Here is my dilema coping a single angle is not a issue but adding multiple tubes and then rotating and angling back makes it difficult and then coming in on the other end of the tube make it more interesting.
Mitch apparently I cant add a skp file here for you. send me a pm with a email and Ill send the joint to you so you can see it more clearly with all the angles happening.

Ill have to get it Tommoro I can snap a picture of the actual piece and send you a file tommoro if you need it. And I appreciate the coping for dummies. This is way out of my expertise.

The angle should be calculated from a existing centerline in two steps possibly 1 -3 tubes intersecting then select the tube we want to cope to the node.
Sdmitch are you in the US?

Ok I just looked at some ruby stuff way over my head....

what the intersect faces routine?

This is exactly what Im looking for. If there is no plug in for it I would give a go at making one if there is a tutorial on making plugins.

Like this. There are simple calculators on line for bicycle frames, but Im into some multiple tube butt joints it would be helpful for.

Imagine a piece of paper wrapped about the outside of the tube you want to notch the ends of. The paper would have the contour of how the tube would be notched to fit against the mating tube. Simple notches are easy to do just set a milling machine head to the angle and go, but offset angled or rotated make it difficult.

Ill look for a picture.

Is there any plugin for making tube wrappers to mark and cope fits for tube interfaces?