Mechanical drawing isn’t like regular drawing. It’s much harder and much more precise. When you are mechanical sketching something you need to make sure your being accurate. For example in this photo I used a 4” by 2” object, in order to figure that out I had to measure it. As you can probably tell by the photo that drawing is not drawn to size, but it is drawn to scale. Each one of those cubes is equal to 0.25 of an inch. Where it says 4” there are sixteen squares (4 x 4 = 16) and where it says 2” there are eight squares. (2×4=8) The reason we draw things to scale is so anyone can look at it and figure out exactly what you want.