3d AutoCAD Modeling for a Staircase Drawing

Creating 3D Architectural Models | Constructing the Staircase 

In this section, we are going to learn how to create a simple stair going from the ground floor to the first floor with one leaf. We will need 15*190 height of steps to fill up the total height of 2850 from the ground to the first-floor level which is the addition of (2625 + 225).

See Fig.18 below for more clarification of the process.

Fig.18- Defining a new UCS is essential for helping in the process

Then create a new UCS by using the Home tab > Coordinates menu > 3 Point tool. At the Specify new origin point <0,0,0>: prompt, specify any point you want but always select a helping position for you.

I can say that the wall beside the stair is the best that you can get as shown in figure 18 above.

Next, and while staying in the same command, respond to the prompt Specify point on positive portion of X-axis <1.0000,0.0000,0.0000>: by picking forward horizontally any point on the positive portion of the X-axis.
Deactivate F3 to avoid selecting any unwanted points on your way. Then finally, same as before, and at the Specify point on positive-Y portion of the UCS XY plane <7819.8408,9074.4786,0.0000>: prompt, pick forward vertically any point on the positive portion of the Y-axis, which will end the command.

On the segment that determines the full length of the level between the ground and the first level, draw a line of 2850, then divide it into 15 parts using the Divide command or by typing DIV.
Fourteen points (nodes) appear along the line dividing it into fifteen identical segments every which defines the height of a single step. (Fig.18)

- Note: You can customize the appearance of those points with the DDPTYPE tool for better integration into your drawing.

Using the Join command now will convert the polylines you just copied into one single entity.
While keeping the same UCS, offset the polyline formed by 25 to create the tiles’ thickness, then close the two from both ends to create a closed polyline.

Besides, join by drawing a line between the lower corners of the stair-line as shown in the next figure below. Offset it by 160 and remove the initially drawn line and keep the new one.

Now, we will extrude the tiles of the stair by [900 + 25] —The addition is for the tile thickness which overlaps by the same value as well. So far, your work should match the next illustration.

Get back the UCS to World and let’s create the remaining three steps by using the BO command; pick inside the first step to create a closed polyline from its boundaries and then extrude it by 190. If you choose to keep your current UCS position, you can do that but, remember to disallow the Dynamic UCS  on the Status bar in the lower part of your screen, then use the Presspull command instead to extrude the polyline by 190, as shown.

Do the same for the other two steps but of course by changing the extrusion height value accordingly.

Next, and while keeping the UCS aligned to the wall, count six steps from the straight leaf and draw a vertical line from it and join it with the other oblique line already there. You just created a polyline shape that you will extrude by 900. (See the pictures below)

Adding the Handrail to the Staircase

As you can see, I did add a handrail to the model by using simple tools, mainly the Extrude while changing the UCS position according to my needs.

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Therefore, you should be practicing using this essential modeling tool for better manipulating and handling it the proper way. For instance, use the Extrude/Path or Direction option to extrude the balustrade section through the oblique line path, and then create copies from it.

Fig.19- The final staircase model featuring the Shades of Gray style View

References in this chapter: