Autodesk inventor Create Staircase Around Silo With Handrail Exercise 45

To create a Silo staircase in Autodesk inventor ,you should follow some important steps in order to avoid some problems .
1 create diameter of the silo
2. calculate the stair length internal and external diameter .
3.find total Hight of the stair and then divided into the number of step .
4 find the angle .
5 360 degree divided by stair angle then multiply with total stair Hight on Pitch dialog box .