General drawing of a spiral staircase

General drawing of a spiral staircase

Initial data
Lifting height 2700 mm
Stair diameter 2000 mm
Inner diameter 100 mm
Number a steps 11
stair rotation angle 450°
Step thickness 50 mm
Step height 245 mm
Step angle 40.9°
step length 950 mm

Additional step sizes
Step width 699 mm
step blank width 746 mm