Old Fashioned style staircase
Learn BricsCAD with practical examples. This week, learn how to use advanced modeling techniques to make a set of stairs in CAD.
Step 1: The steps
To create the steps themselves you have two options:
- Start with a box (first step) measured to the correct dimensions.
- For this example I used: 800 x 160 x 210.
- Use AR to repeat.
- Array values: Col 7, distance - 210 (width of steps), Row -2, distance - 800 (length of steps).
- Then EXPLODE the array.
- Add a rectangle to the end for the middle step.
- Extrude the blocks to the correct height using Push/Pull.
New CAD techniques (advance your skillset.)
- Draw a line to the desired height on the steps.
- Then use DIV to split the line into segments.
- In this example I used height - 2240 and divde - 14.Tip: Enter Settings - Drafting - Entity creation - Point display mode, to change how the points are displayed on screen.
- Now extrude each step, using Node Snap to get the height of each step.
Step 2: The Balusters
The next phase was making the balusters. I used a photograph of a baluster, traced it, and revolved. Then I aligned the balusters along the stairs.
To do this:
- First import an image into BricsCAD use the Attach Raster Image (IAT) command.
- Then, trace one side using SPLINE
- Next draw a line down the center.
- Finally, use REV - 360°. Use your center line as the axis of rotation.
- Use 3P to draw a line between the end point of the top and middle step.
- Or see last week's post for drawing on custom user coordinate systems.
- Then, with a little clever geometry and Node Snap, use MOVE to reposition the line to the correct starting point on the first step.
- Align the baluster center middle with the endpoint of the 3D polyline.
- Then use ARRAYPATH to position the balusters up the staircase. Read more about Array Path.
- The settings I used were: Mode - divide, Items - 8.
I then repeated for the second half of the staircase.
Step 3: The Newel
To make the newel I used a similar technique to model the balusters. I then extruded rectangles to remove the excess material, chamfered, added columns and applied a twist.
Note: Twist is only available in BricsCAD Mechanical or BricsCAD BIM.
To do this:
- Create your top and base parts in the same way as the balusters.
- Next use EXT Subtract, Both sides.
- Apply a chamfer to the hard edges.
- For this example I used a radius value of 20.
- Then draw in the columns. Use ARRAYPOLAR to repeat the object 4 times.
- Use UNI to create a solid object.
- Finally, apply TWIST. Use the centerline as your axis. Place the start and end points of twisting axis between the rectangular portions to prevent the rectangular portions becoming twisted.
Step 4: Finishing Up
I removed the excess material by drawing the cutting line on to the steps and added wall details. Then I imported the newel and extended the handrail.