EXAMPLE 2.6 The process planning engineer of a firm listed the sequences of operations as shown in Table 2.3 to produce a component. Table 2.3 Data for Example 2.6 Sequence Process sequence 1 2 3 Turning - Milling - Shaping - Drilling Turning - Milling - Drilling All operations are performed with CNC machine Elementary Economic Analysis 23 The details of processing times of the component for various operations and their machine hour rates are summarized in Table 2.4. Table 2.4 Machine Hour Rates and Processing Times (minutes) for Example 2.6 Operation Process sequence Machine hour rate (Rs.) 1 2 3 Turning 200 5 5 400 8 14 Milling Shaping 350 10 Drilling 300 3 3 CNC operations 1,000 Find the most economical sequence of operations to manufacture the component