QUESTIONS FOR SELF-TESTS

1. What is the purpose of converting a complex drawing?

2. What are the ways to convert complex drawing.

3. What are the main tasks are solved by converting the drawing?

4. What is the essence of the method of plane-parallel transfer?

5. What is the replacement of the projection planes?

6. What tasks can be solved by replacing two projection planes?

7. How should new projection planes be positioned so that a segment of a straight line in general position is projected full-scale, to a point?

8. How should a new plane of projections be positioned so that the plane of general position becomes projecting?

9. At what location of a flat shape can its true value be determined by replacing only one projection plane?

10. What is the essence of the transformation of the drawing method of rotation?

11. What lines are used as rotation axes?

12. How does the frontal projection of an object change when it is rotated around a frontally projecting straight line?

The purpose of transforming a complex drawing: to improve the understanding of the shape and size of an object, to identify true sizes and angles.

Transformation methods: plane-parallel transfer, replacement of projection planes, rotation.

Main tasks: determining the true size of segments and angles, finding intersection points and mutual arrangement of elements.

The essence of plane-parallel transfer: transferring all points of the drawing parallel to the main plane to preserve their mutual arrangement.

Replacement of projection planes: introducing new projection planes for the convenience and accuracy of depicting elements.

Tasks when replacing two planes: obtaining full-size projections, simplifying geometric constructions.

Location of new planes: planes must pass through the start and end points of a segment so that it is projected full-size or to a point.

Location of a new plane: the new plane must be parallel to the plane of general position.

Location of a flat figure: the figure must be parallel to one of the projection planes.

The essence of rotation: rotating an object around an axis to obtain a new full-size projection.

Rotation axes: horizontal, vertical, frontal.

Changing the frontal projection