Stair Tangent for iPhone
Circular Stairs Functionality
This function will calculate circular stair dimensions based on the inside radius, line of travel dimension and the width of the tread at the line of travel. It has stair tread width building code error checking for the inside tread width (cord of arc) of 8". The width of the tread at the line of travel is used first, to determine the width of the inside radius tread. By changing the width of the tread at the line of travel, it will also change the circular stair rotation angle. The circular stairs can have 2 to 20 plus stair treads.
Use the inside radius dimension and the calulated Dimension X and Y to layout the circular stair rotation angle.
Example calculated output from StairTangent for Circular Stairs
StairTangent
Circular Stairs
Number of Risers 18
Total Height of Stairs 126 1/2''in
Number of Treads 17
Riser Height 7 ''in
Stair Width 42 ''in
Line of Travel 12 ''in
Width at Line of Travel 10 ''in
Stair Rotation Angle 162.52652°
Tread Rotation Angle 9.56038°
Dimension X 45 13/16''in
Dimension Y 14 7/16''in
Free Standing Stringers
Inside Stringer
Radius 48 ''in
Tread Width 8 ''in
Tread Arc Length 8 ''in
Tread Diagonal 10 5/8''in
Plan View Arc Length 136 3/16''in
Stringer Length 191 13/16''in
Pitch Block Angle 41.29841°
Housing Angle 41.26545°
OutSide Stringer
Radius 90 ''in
Tread Width 15 ''in
Tread Arc Length 15 ''in
Tread Diagonal 16 9/16''in
Plan View Arc Length 255 5/16''in
Stringer Length 298 7/16''in
Pitch Block Angle 25.10396°
Housing Angle 25.07843°
Sent from my iPhone
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