Create a 3D Model
Spiral Staircase with Railing
Directions: Use AutoCAD to create a 3D Model of a Spiral Stair case with Railing and then attach material to
the model to make it look more realistic. (YouTube video – Spiral Staircase)
Steps for the Steps & Center Pole
1. Draw a circle with a radius of 3’6”. This will be used to make the stairs for the staircase.
2. Draw another circle from the center of the first circle with a radius of 6”. This will be used to make the
center post of the staircase.
3. Draw a line from the inner circle’s bottom quadrant out to the larger circle.
4. Use the Array command and click on Polar Array to create 12 lines equally spaced which will become
the steps for the staircase.
5. Follow directions on the command line. The center of the array is the center of the circle. The number
of items to 12. The degree of the array is 360.
6. Extrude the inner circle 10’
7. In the command line type
boundary to create 12 separate
boundaries for the steps.
8. Extrude each of the 12 steps 2”.
9. Move a step up 6”, the next step
1’, the next step 1’6”, the next
step 2’, and continue the pattern
until all of the step are move up
the center pole.
10. After the first 12 steps are
moved up the pole copy the next
7 steps from the corresponding
step below and move them up 6”
above the previous step.
11. There should be 19 steps on the
center pole spaced every 6”.
12. Fillet the front outer edge with r=1”.
Steps for the Railing
1. Create rods for holding up the railing with r=1” and 3’ in height.
2. Place the center of the rods on top of the step at the center of the fillet edge.
3. Create a Helix to create the top of the railing.
a. The center will be located at the center of the center post were the top edge the step intersects.
b. The radius should be the radius of the outside of the step.
c. Height turn will be 72”.
d. Height will be 108”.
e. Move the Helix up to the top outside edge of the rod and adjust if needed.
4. Sweep a circle with a r=1” on the path of the Helix.
5. Presspull the front of the railing to extend in front of the rod at the bottom and the top of the stairs.
6. Fillet with a r=0.125” on the ends of the railing.
Attach Material to the Staircase