This book deals with the practical problems connected with the adjustment and use of planets, shapers, slotters and milling machines of standard and special designs. Each subject is treated from the standpoint of the man in the shop, and a special efiort has been made to present needed information per taining to problems which the practical man often finds dificult to solve. Many operations from actual practice are illustrated and described to show the adaptability of different machines for certain classes of work, and the relation between various designs and types. Examples and operations have been selected that would not only show how a specific result is obtained, but illustrate fundamental principles and serve as a general guide. Descriptions of methods involving mathematical calculations contain the necessary rules or formulas and are accompanied by examples illustrating the problems which arise in actual practice.