The lengths of the front view and the top view are aligned.
The front view is flush with the left view.
The width of the top view and the left view are equal.
Three views describe the relationship between any two views in words, in which the main view and the left view cannot fluctuate up and down, and the main view and the top view cannot swing left and right. Three-view projection law is the most basic projection law that must be followed when drawing and reading three-view assembly.
When applying the projection law to draw three views, we should pay attention to the relationship between the six directions of the object and the views.
The connection between the front view and the top view is ensured by vertical lines.
The connection between the main view and the left view is realized by a horizontal line.
The relationship between the top view and the left view is represented by a diagonal line of 45 degrees, and when drawing and reading three views, the gauge is often used for equal width, that is, the lower part of the top view and the right side of the left view reflect the front of the object, that is, the structure far from the main view is in front of other structures; The top of the top view and the left side of the left view reflect the back of the object, so when measuring the width in the top view and the left view, we need to pay attention to the position and direction of the starting point to ensure the equal width.
Turn left | turn right
Turn left | turn right