How to make a Spiral Staircase.

In this project you will be using Array allot. This is a very useful function. Some is to scale, others I make up as I go along. The purpose here is to give you an idea of the mechanics and then you can do your own designs.

First to make is a step, create a Circle as shown. 4 unit rad.

Next create a Curve/Helix, same radius and 8 units high, and one turn.

Next use Surface from Planar Curves to create a surface from the circle. Next create a Line Segment from the center to the side.

Now use Transform/Array/Along Curve to multiply the line segment 14 times. Make sure you have "Style" "Road like" selected.

Now Split the surface with the lines selected. This will give you a pie segment that will be your step.

Now use Solid/Extrude Planar Curve at a thickness of .2 units to create a step, then delete the surface, or use Extrude on the edges, Join the pieces and then use Solid/Cap Planar Holes.

Page 2