Interference in Involute Gears:

There are four kinds of teeth that have been standardised for interchange ability as illustrated in Figures (a), (b), (c) and (d). Each of these four teeth systems is conjugate to the basic rack.

     (a) 20^o Full Depth Teeth 

         (b) 20^o Full Depth Teeth

  (c) 20^o Stub Teeth

                (d) 14.5^o Composite Teeth

     Standard Teeth

Figure (a) illustrates full depth involutes teeth in which addendum is one module and dedendum is given as 1.15 m. The working depth is '2 m'. Figure (b) illustrates 14 ½ ^o full depth teeth in which just pressure angle is different and other parameters are similar.

Figure (c) illustrates 20^o stub teeth in which addendum is equal to 0.6 m. The dedendum is equal to 1.2 m and the working depth is given as 1.6 for these teeth. Figure (d) illustrates composite system of teeth. In these teeth, they are built up of circular arcs at the top & bottom. The middle part of the teeth is a straight line. The straight portion equivalents to the involutes section whiles the top and bottom corresponding to the cycloidal section.