3
Geometrical Constructions, Loci and Engineering Plane Curves
OBJECTIVES
After studying this chapter, you will be able to
Divide a line into equal parts
Draw regular polygons
Draw lines and arcs tangent to each other
Draw curves used in engineering practice such as conics, cycloids, involutes and spirals
Draw normals and tangents to a given engineering curve
Draw the path of a point on a selected part of a machine that undergoes motion owing to the effect of another part
3.1 INTRODUCTION
The exact shape of a curve often decides the proper working of a machine and inaccuracy results in noisy or ineffective working. For example, the shape of gear teeth should be either a perfect involute or a cycloid. As the shapes of objects used in ...
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