1, set the system unit as mm 2, create the staircase center column:
Draw the cylinder, radius 70mm, height 3650mm, move the cylinder to the origin of the coordinates;
3, create the tread:
Create the tubular body, radius 1 900mm, radius 2 70mm, height 50mm; the number of sides is 4 ; check Enable slicing, slice from 24. move the tubular body to the coordinate origin (so that it is aligned with the cylinder.). Alignment can also be done by turning on Capture: Axis Points, by moving the object so that the axis point of the tread captures the axis point of the center column); rotate the starting edge to the 0X axis positive direction. The height of the tread is 192mm, the height is 3650, so the number of tread is 3650/192=19.01 (take 18)
4, move the tread: move up 192mm.
5, rotate to copy the staircase
Z-axis increment of 192mm, rotate the angle of 24 degrees (the previous slices are set to 24, and the angle is positive and counterclockwise.)
6, so that there is an overlap between the steps
Select a step, add an "Edit Polygon" modifier to the step, go to the polygon level, select the edge, the implementation of the extrusion, the height of 35mm.
7, to thicken the thickness of the step and the side of the center axis In the vertex level, select the center axis and move the vertex. Move the vertex.
8, drawing rotary handrail
2D graphic drawing / spiral, the parameters are set as follows:
Radius 1 and radius 2 is set to 850 (slightly smaller than the maximum radius of the step), the height is set to 3650mm, the number of rotations is set to 1.2 (24 * 18 = 432 degrees, then divided by 360 degrees, to get 1.2); set the direction of counterclockwise (and step) (consistent with the direction of rotation of the tread).
Set the handrail coordinates to the origin, aligned with the step. Move the handrail up 1092mm (900+192 (height of first step)). Set the radial thickness of the handrail to 30mm.
9, draw the railing
Draw the railing with a cylinder, change the position of the axis point to the origin, set the angle of capture (capture angle of 6.5 degrees), rotate the copy of the three, respectively, to adjust the height of its handrail and its connection.
After the four railings into a group, re-change the position of the axis point to the origin. Array copy: (parameters with point 4)