2. Find the sequence that minimizes the total elapsed time (in hours) required to complete the following jobs on two machines. Job 3 4. 6. 8. Machine A 4 6. 8 4. Machine B 4 9. 8. 11 563 258 26

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Metrology of Screw Threads

Screw threads are a series of ridges having the profile of a helix. This helix profile runs continuously along the length of a uniform solid or a hollow bar of a circular cross-section at periodic intervals. These helix ridges are also formed over a conical bar. These continuous helical ridges are termed threads.