What is the axis drawing method of drawing mechanical principle tool diagram?

In the first step, draw the vertical OZ axis. From the OZ axis, 120 degrees to the lower right from point O, draw the OY axis, then rotate 120 degrees to draw the OX axis. The second step is to select the most representative face of the object and place it in front of us. Squint your eyes and imagine what shape it will be projected onto the XOZ plane. This is the "front view", often called the "main view". Master a principle: "If you can't see it, draw a dotted line."

The third step is to move the object toward your arms, flip it over, and place the "main view" side on the table. Then look at the graphics on the chest. This is the "top view". The fourth step is to "pull it up" again. Return to the position of the main view just now, and then push the right side of the object back at a right angle so that the left side reaches our chest. Look at the shape of the chest and draw it. This is the "left view".

Note:

1. The "deformation coefficient" of each "measurement" of "length, width and height". There are two selection methods. One is, 1 to 1 to 1. If you draw a "circle" with this method, the diameter of the circle, that is, the long axis of the elliptical shape, will be about one and two times the diameter of the actual circle. It seems a bit too big. The other is that the "deformation coefficient" is 0.86 to 0.86 to 0.86. In this way of drawing, the long axis of the ellipse is equal to the diameter of the actual circle. But the length of many straight edges appears "a little short." In short, each has its own merits, but many people like to use 1:1. Because the calculation process is much easier.

Two. In the "isometric" drawing method, there is a principle, which is to use this method more often for rotating bodies; to use this method as little as possible for polyhedrons.

Three. If there are absolutely no "horizontal lines" allowed in the three pictures you draw, it would be a big joke.

You can understand the above.