it was noticed that only three of the four tools were actually required: T1, T2, and T4. Once the tool list had been settled, it was necessary to determine the tool paths. This involved deciding which parts of the component should be machined in what order, and the route that should be taken. The order of the features to be machined was quite easy to see:
             @ Face mill the billet to size using T1
             @ Drill the holes in the boss using T4
             The holes in the boss could have been drilled before the pocket was machined, as the two were not dependent upon each other. Although this was considered, along with using tool T3, it would have involved an extra tool change, which was deemed unnecessary. Next the route of the cutter had to be determined:
             In order to write an effective part program, it is essential that the user has a good understanding of the machine code required. This section gives a brief outline of the code used. The part program for the machined component can be found on page 8.
             There are many different parts to the code, and this example gives an idea of the code necessary to complete a set of instructions:
             The letters in the machine code give the memory address of the instruction, and the number indicates the value. Together they give an unambiguous instruction. Various examples of memory address functions can be seen overleaf
             These codes prepare the machine for the task at hand, and control the way in which the machine moves about the axes. G
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