After the design has been cut on the emery-wheel all its rough edges are smoothed off on a stone of much finer grain.
In this device the emery-wheel is driven by belt power as follows.
The emery-wheel and gear pinion d are fast together, and a pin passes through and holds g and h together.
It is manufactured into wheels, in structure like the emery-wheel, and serves the same purpose.
Now, let us substitute for the emery-wheel another wheel of the same size made of vulcanized rubber, glass or resin.
On the end of the emery-wheel spindle is a feed lever, by means of which the emery-wheel may be fed along the lathe centre.
Now an emery-wheel will take a cut whose fineness is simply limited by the wear of the wheel in the length of the cut.
The heat that has been developed is the measure of the mechanical energy that I have used against the emery-wheel.