Fig. 2004.
The amount of clearance that may be given in this way is limited by the spacing of the teeth and the diameter of the emery wheel, as is seen from [Fig. 2004], it being obvious that when tooth a is being ground the emery wheel must clear the rear tooth b or it will grind its edge off, and it is obvious that the smaller the emery-wheel diameter the more the tooth to be ground may be set in advance of the line of centres of the wheel and spindle. It may be pointed out, however, that there are two methods of adjusting the cutter to the wheel.
Fig. 2005.
Fig. 2006.