A production manager must determine the processing sequence for seven jobs through the grinding and de-burring departments. The same sequence will be followed in each department. The manager’s goal is to move the jobs through the two departments as quickly as possible. The site supervisor of the grinding department wants the SPT rule to be used to minimize tire work-in-process inventory' in his department.

a. Prepare a schedule using the SPT priority rule for the grinding department (using tire grinding times).
b. What is tire total flow time in the grinding department for the SPT sequence? What is tire make-span for the seven jobs in both the grinding and de-burring departments (using tire sequence found in part a)?
c. Determine a sequence that will minimize tire make-span in both departments. What total flow time will result for tire grinding department?