This handbook was developed and refined over several years as part of a course to teach working machinists how to use Mastercam. It assumes the reader has a basic understanding of conventional and CNC machining, including how to setup and operate CNC machines. This book can be used as the anchor of a comprehensive course in Mastercam, as a self-study guide, or a shop reference. A unique feature of this book is its top-down approach to learning along with practical applications. Concepts and topics essential to the effective use of CAD/CAM, such as cutting speeds and feeds and CNC setups, are included as are best pratices and expert tips. The result is a well rounded CNC programmer that is able to meet the demanding requirements of industry and able to grow and adapt as technology advances.