Calculation a di dimensions a one spiral staircase

Calculation of a spiral staircase

Please indicate di dimensions weh yuh need

H - Stair height
D1 - O.D.
D2 - Inner diameter
C - Number a steps
Z - Step thickness
A - stair rotation angle

reference

Di length a steps inna spiral staircases shudn't be less dan 80 cm.
Di width a di step inna di central part shuda be at least 20-25 cm, inna di widest part - no more dan 40 cm. Di height a di steps a one spiral staircase maita bi greater dan di height weh dem recommended fi marching stairs. Di normal height a steps fi marching stairs is 16 cm, fi spiral stairs - 18 cm.

Inna di place weh di foot step, di step a di spiral staircase shuda be bout 25-30 cm, along di edge - at least 30-35 cm. Dis step depth ago be quite convenient.

Dimensions of steps of spiral staircases.

h - step length
W1 - width a step at wide part
W2 - step blank width
α - design step angle