This board illustrates the process of cutting of involutes Gear Teeth, by use of rack type

cutter It consists of 3 white acrylic discs A, B, C. having pitch circle diameter 450 mm, 300

mm & 200 mm respectively. A gear tooth profile with module 25mm can be traced out on a

peace  of  paper  placed  between  disc  and  cutter.  An  affect  of  Interference  and

Undercutting on correct profile of gear tooth can be studied from the profiles traced.