I need a little help with calculating the start points and/or end points of angles and arc blends. For instance: [hypothetically} a lathe part that has a 30° taper that blends into a .125 (G02) radius that might need to blend into a 1.25 (G03) radius. It isn't often but sometimes I'll get a part to program that will have some kind of radius to an angle on it and I don't have a CAD/CAM package to fall on. I was once taught how to 'find the triangles' and calculate the points using simple trigonometry. Unfortunately, after [almost] learning this six years ago, I haven't had a need to use this knowledge since. Can somebody here point me to some kind of tutorial somewhere that will help me teach myself these skills?

Thank you.

PR