TABLE OF CONTENTS Generally, there is more than one way to machine a specific item. A hole, as an example, may be drilled, punched, broached, cast, or formed by some other process. A slot at the end of a shaft may be sawed, milled, broached, or formed by some other process. There are also different ways of specifying machining requirements on prints. Some prints give specific and detailed instructions. Other prints show final dimensions and do not specify any machining instructions. The purpose of this chapter is to review some of the different ways that machining requirements may be specified on prints. This review will provide an awareness that there are differences in machining operations as well as differences in the way machining is specified. Different types of requirements will then be easier to recognize when they are seen on a print.
The reasons for different methods and why they are used will also be examined. Before reviewing machining requirements, it must be stated that no attempt will be made at trying to determine which method is the best method. Each organization uses the method or methods that best suit its needs.
Notes for machining requirements can be placed into three groups: specific machining, general machining, and no machining. The way each method may be shown on a print will be examined.
Prints that show specific machining information may include all or most of the data pertaining to the machining operation; the information may be shown on...
