Orthographic Drawing – Control Bearing

NOTE: You are not to reproduce the drawing below. You need to create the orthographic drawing of it.

The Drawing

STEP BY STEP

STEP 1 – DIMENSIONS

Start by figuring out the object’s length, height and depth.

STEP 2 – THE VIEWS

Decide which view is the front view. For this drawing, the front is in lavender (below).

STEP 3 – BOUNDING RECTANGLES

Imagine bounding rectangles for each view (see below).

STEP 4 – RECTANGLES IN AUTOCAD

In AutoCad, draw each rectangle to represent your views. In the example, notice that the front view is 128 by 41.5. The top view is 128 by 50. And the right side view is 50 by 41.5. I decided to leave a gap of 15 between the rectangles.

The Top View should appear above the Front View and the Right Side View should appear to the right of the Front View.

The example drawing should now look like this so far:

STEP 5 – THE DRAWING

Now, we can start the drawing. I usually start with the easiest view and work my way to all three. The order in which I choose to do this drawing may differ greatly from the order that another person would do the drawing.

In the example, I am starting with the top view.

Features on the top view line up with the front view. So we can simply extend lines from the top view to the front view. (We will delete these lines after.)

I then work on the front view.

Notice the orange lines. They represent a surface that is hidden from the viewer in that view.

I now erase the temporary lines between the views.

I can now do the Right Side View. I can use measurements from the drawing or I can extend lines from the Front View.

I have decided to extend the line from the Front View that gives me the hidden line on the Right Side View.

We can actually also extend lines from the Top View to the Right Side View (and vice versa) by using a 45 degree diagonal line that starts at the top right of the Front View (like below).

And now I extend the lines that take a 90 degree turn when they hit the diagonal line.

With these temporary lines, I can now tell where the features on the Top View appear on the Right Side View.

I can now complete the Right Side View.

And now I remove the temporary lines. I can also trim the parts of the initial rectangles that are no longer needed.

Done!