does anyone know if there's a relationship between compound angle formulae in math + compound angle in joinery

Question

compound angle formulae in math involves all sorts of sine, cosine stuff e.g. sin(A + B) = sinAcosB + cosAsinB and i would like to know if you could use stuff like this practically for things like cutting wood where the intersecting components meet at angles when viewed on two different planes.
if there is a way, would it be possible to explain to an idiot like me? thanks

Answer 1

I don't really know what you mean by a compound angle in joinery. 'Viewing angles on different planes' suggests something to do with perspective to me.

You are no doubt familiar with the 'impossible' dovetail joint where the wood appears dovetailed both in plan view and in end elevation. I have often wondered how you work out the angles for that and mark up the wood, but I can't imangine these trig formulae coming into it.

Answer 2

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Answer 3

I would suggest - very much so!!

But I would not know what exactly you are needing to know.

Just apply the RULES for the angles in Maths and then transfer your findings to the work-bench :-)