The objects surrounding us have the form of solids or their combination. At the heart of forms of details of mechanisms and cars solids or their set lie too. The characteristic signs have all geometrical forms. When reading the words "cube", "sphere", etc. each of us will present their form, a characteristic image at once.
Instruction
1. To execute the drawing of these solids, it is necessary to make the analysis of their form, to break mentally into geometrical figures.
2. Let's say you are faced by a task to make the drawing of a cylinder. Remember the theory. If to take a rectangle and to begin to rotate it around one of the parties, then the body which is called a cylinder will turn out. Thus, the cylinder is a solid which is limited to two equal circles and the cylindrical surface similar to a rectangle. The word "cylinder" came to us from Greek language and designates "roller", "skating rink".
3. The sizes of a cylinder are defined by height of h and diameter of the basis of d. To make the drawing of a cylinder, construct a rhombus and enter in it an oval. Make creation of the oval entered in a rhombus in the zadnny sequence. Construct a rhombus with the party equal to diameter of a circle. For this purpose through a point About carry out axes x and at. From a point About postpone the pieces equal to radius of the represented circle for them.
4. Through points and, b, with and d draw the straight lines parallel to axes, receive a rhombus. The most part of an oval has to be located on the big diagonal of a rhombus. Enter an oval in a rhombus. For this purpose from tops of obtuse angles (points And yes C) describe arches. Their radius to R is equal to distance from top of an obtuse angle (points And yes C) to points with, d or and, b respectively.
5. Through points In and and, In and b you draw straight lines. With the big diagonal of a rhombus find points of C and D in crossing of straight lines of Wa and Bb. These points will be the centers of small arches. Their radius to R1 is equal to Sa (or Db). Arches of this oval smoothly connect big arches of an oval. Then from points To and N draw the parallel straight lines equal to height of a cylinder and draw a half of an oval, using the calculations given above.
6. If you need to make projection of a cylinder, then here the drawing needs to be made taking into account arrangement of the parallel plane. In figure No. 2 execute the drawing of a cylinder concerning plane H in the form of a circle. As the circles lying in the cylinder basis are located parallel to horizontal plane H, and their projections to this plane will be circles too. Execute a frontal and profile projection of a cylinder in the form of rectangles. When performing projections always you put symmetry axes.