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there are several factors to consider building these sets. I never framed one out because all our stairs are shop-built, but I've laid them out many times.
Usually you're somewhere between a 7' and an 8' radius. Could be a much greater radius, but usually not shallower because of the tread requirements and aesthetics. On a tight radius, keeping the inside tread at a minimum of 6", your outside tread will become very deep and unsightly.
So. See what radius works best for the number of treads and the room that you have. Pin your point and scribe the outside and inside stringers. Take the circumference of either one and split that up into the number of treads you have. Snap all your tread lines back to your pin point. Then it's just a matter of cutting pieces.
As far as structural stringers go, it's a laminating process. You have to rig a temp wall, set your tread points on it and then laminate the stringer wild and cut plumb and level once it sets. Pain in the neck to do in the field, but if I ever get enough $ for one I'd love to give it a shot. You can build up girth with 1/4" ply to whatever you feel comfortable with given the number of treads. Shops usually give us a 2"x12" lam stringer for a 10' tall stair.
It's as time consuming affair as anything you don't do every day, that's why it pays to farm this type of stuff out to stair shops. They're geared up with all the widgets and movable walls and CAD sheets.
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