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Here’s another circular stair problem that should fluff up the grey matter. In the attached diagram below, 1/4th of a circle is divided into 10 equal parts, resulting in 10 treads, or, 9º per tread.
The riser height is 7 1/2″
The inner radius of the circular stair is 5′ 0″, and the outer radius is actually 9′ 0″, if we allow the treads to run all the way out, and then build the 2 x 4 circular wall on top of the treads. The 2 x 4 wall will be about 36″ high and act as a handrail.
My job as a rough framer is to cut the studs, nail them in place and then rip several layers of plywood to top plate this circular wall.
I know the radius on the floor is 9’0″, but the top of the circular wall is inclined at the same angle as the stairs, so I need to determine the new radius to cut these 3 1/2″ plywood strips.
Given the information shown,
(1) what bevel would you cut on top of the studs? (5 milkbones)
(2) what radius would you use to cut the plywood strips directly above the 9′ 0″ radius on the floor. (15 milkbones)
Also, see my next posts which will appear very shortly, showing photos, and giving some hints.
I’ve emailed Ted LaRue and asked him to give us a little time with this, before he posts, as I have a feeling that this is right up his alley, and I wanted to see how Stan, blue, AJ, Joe, and some of the others would deal with this problem first.
Replies
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Here's another circular stair problem that should fluff up the grey matter. In the attached diagram below, 1/4th of a circle is divided into 10 equal parts, resulting in 10 treads, or, 9º per tread.
The riser height is 7 1/2"
The inner radius of the circular stair is 5' 0", and the outer radius is actually 9' 0", if we allow the treads to run all the way out, and then build the 2 x 4 circular wall on top of the treads. The 2 x 4 wall will be about 36" high and act as a handrail.
My job as a rough framer is to cut the studs, nail them in place and then rip several layers of plywood to top plate this circular wall.
I know the radius on the floor is 9'0", but the top of the circular wall is inclined at the same angle as the stairs, so I need to determine the new radius to cut these 3 1/2" plywood strips.
Given the information shown,
(1) what bevel would you cut on top of the studs? (5 milkbones)
(2) what radius would you use to cut the plywood strips directly above the 9' 0" radius on the floor. (15 milkbones)
Also, see my next posts which will appear very shortly, showing photos, and giving some hints.
I've emailed Ted LaRue and asked him to give us a little time with this, before he posts, as I have a feeling that this is right up his alley, and I wanted to see how Stan, blue, AJ, Joe, and some of the others would deal with this problem first.