I cut the angled tenons with a back saw after laying them out with a mortise
gauge and a bevel square. :-)
It's much easier than trying to set up a machine to do it. :-)
You may want to view the Frank Klausz video on mortise and tenon joints. He
has a very good segment on this issue.
He uses wedges and a hollow chisel mortise.

"Bob" wrote in message
news:f7vSc.240801$%_6.465@attbi_s01...
I am starting a set of 10 dining chairs and have a few questions/problems
regarding complex angles on the tenons.

snip