A cogwheel is such a "toothed" wheel, which helps to walk exactly mechanical watches and to drive cars. There are many types of gears for various transmissions in mechanical engineering. For the manufacture of any part, a drawing is required. But how do you draw a gear?
It is necessary
- - album sheet;
- - pencil;
- - compasses;
- - eraser.
Instructions
Step 1
Draw a large circle in the middle of the sheet. Now leave the leg of the compass in the center formed and draw a circle of much smaller diameter. Get two circles, one in the middle of the other.
Step 2
Draw vertical and horizontal centerlines through the centers of the circles so that they extend slightly beyond the boundaries of the shapes. Draw two more straight lines through the center of the circles so that they divide each of the resulting four parts in half.
Step 3
Place points at the intersection of all lines with the border of the small circle. Draw short, equal segments located on the outlines of the figure, with midpoints at these points. The distance between the segments will be the basis for the teeth in the form of trapezoids.
Step 4
Draw straight lines through the center of the circle for the third and fourth times for equal lengths of all segments. Each time, the lines should divide the segments in half. Test this with a compass or rectangular ruler, turning it constantly.
Step 5
Connect with oblique lines the extreme points of the initial segments of the small circle with the segments of the large one so that teeth are obtained. Give them a smooth shape. Remove all unnecessary lines with an eraser.
Step 6
Draw the gear in a simpler way. Draw a circle and draw straight lines through its center in the same way as in the previous method. At the intersection of lines with the boundaries of the circle, put points that will be the centers of small identical circles. Leave the semicircles drawn, extending into the depths of the large circle. Remove excess lines with an eraser. Sketch the gear, the jagged base with a dark color, leaving light semicircular gaps. Determine the number of teeth by the number of lines drawn through the center, observing symmetry.
