Extreme angles on table saw
Hello, all! I'm new to the world of woodworking: did some shop class stuff and Boy Scouts, but otherwise, not much.
My friend and I have been working on putting together a coffin for Halloween. To do this, we've found that getting the miters of the side planks to meet up is really tricky: the angles are extreme (12 deg., 56 deg., etc).
Of course, the table saw will slant, but only to 45. For some cuts, we can simply use the complimentary angle and run it through the other side. On others, though, no solution is obvious. We ended up building up a second piece of wood to raise the angle of the wood being ripped (dangerous).
So, what's the right way to do this? How do you cut extreme angles on large boards?