Processing of Machining Operations
Having selected a machine capable of handling the required work, the next task confronting the part programmer is to decide on a suitable sequence of operations.
In order to do this effectively the programmer should ideally have a thorough understanding of the capabilities and operating procedures associated with the particular machine to be used, and adequate knowledge of the work-holding equipment and tooling that can be employed.
It is often the case that, giving due regard to safety requirements, a machining task can be tackled in more than one way with equally good results in terms of dimensional accuracy and surface finish. The programmer must always bear in mind one objective is to complete the machining as quickly and efficiently as possible.
The first is to carry out as much machining as possible at one work setting and to avoid unnecessary repositioning of the work since this can be a very time-consuming operation. The second is to carry out as much machining as possible with each cutting tool called, and to avoid unnecessary tool changing or indexing. The programmer should bear these points firmly in mind when listing the sequence of operations to be adopted.
The compilation of the process of operations to be used will not only be an aid to logical thinking throughout the rest of the part programming process, but it is also likely to be of value to the machine operator and may be required as a record for future reference. The more complex the component, the more vital the compilation of the process becomes.
It is likely that the operations process will form just part of the general documentation relating to a particular job, which will also contain information relating to work-holding, tooling, speeds, and feeds.