Douglas T. Hamilton 
Automatic Screw Machine Practice 
Circular Form and Cut-Off Tools for the Brown and Sharpe Automatic Screw Machine

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. When any given piece or work is to be made on the screw machine, the methods of arranging the operations and the tools to be used should be decided upon before designing the cams. One of the first things to consider is the method of applying the circular form and cut oif tools. The methods, or course, will vary to a considerable extent, according to the shape of the piece to be made.