I am in the final planning stages of my observatory and putting the finishing touches on my blue prints and had a question regarding building the roof transition for the dome.
I am planning on building a roof transition similar to what KennFromTX has built. My question is how do I go about calculating the compund miter cuts needed for the roof rafter span between the corner of the octagon to the corner of the outer square? I've never done compound miter cuts before and while I can figure out the angles needed mathematically based off the blue prints, I dont know which angles are relevant to the cut or how to set the angles on the saw to make the needed cuts. Any help or links would be appreciated.