QUESTIONS FOR SELF-TESTS

1. Give the definition of a complex drawing.

2. Name and designate the main projection planes.

3. What is a vertical communication line, a horizontal communication line?

4. What is the name of the distance that determines the position of a point relative to the plane of the projections P 1 , P 2 ?

5. How to build a horizontal projection of a point, if the drawing has its frontal, profile projection?

6. How to build a frontal projection of a point according to the horizontal and profile projections of a point?

7. How to build an additional projection of a point on the plane П 4 _ | _ П 2 , П 4 _ | _ П 1 , П 5 _ | _ П 4 ?

8. What coordinates of a point can be determined by its horizontal projection, profile projection?

9. How can I build a complex drawing of a point according to its coordinates?

A complex drawing is a drawing that includes several types of projections of an object onto different planes, allowing its geometric characteristics to be fully determined.

The main projection planes are:

П1 — horizontal projection plane,

П2 — frontal projection plane,

П3 — profile projection plane.

A vertical connection line is a line connecting the projections of a point on the horizontal and frontal planes. A horizontal connection line is a line connecting the projections of a point on the frontal and profile planes.

The distance that determines the position of a point relative to the plane of projections П1, П2 is its coordinates (abscissa and ordinate).

A horizontal projection of a point is constructed using a vertical connection line from the frontal and profile projections.

A frontal projection of a point is constructed using a vertical connection line from the horizontal and profile projections.

An additional projection of a point on plane П4 is constructed parallel to the corresponding plane and according to the coordinates of the original projections.

The horizontal projection defines the X and Y coordinates, the profile projection defines the Y and Z coordinates.

Construction of a complex drawing of a point: according to the given coordinates of a point (X, Y, Z), its projections onto the horizontal, frontal and profile planes are constructed.