Johnson’s Rule is: Repeat steps 1,2 and 3 filling in the schedule from the front

Question

Johnson’s Rule is:

Repeat steps 1,2 and 3 filling in the schedule from the front and the back until all jobs have been scheduled

Accordingly schedule of jobs as follows :

                                C ------ > B -------- > E -------- >    A ---------- > D ------------- > F

CALCULATIONS

        Operation 1 : C ( 5)   B (13) E( 22) A( 34) D ( 40) F ( 43)

        Operation 2 :        C ( 19)   B( 30) E ( 40) A(44) D ( 46) F ( 44)

        (time in parenthesis is cumulative hours to complete)

        It will take 44 hours to complete all THE jobs

Scheduled Order

Job

1

C

2

B

3

E

4

A

5

D

6

F

THE TOTAL LENGTH OF TIME TAKEN TO COMPLETE THE SIX JOBS ( USING 2ND OPERATION) = 44 HOURS

Scheduled Order

Job

1

C

2

B

3

E

4

A

5

D

6

F

Explanation / Answer

Using Johnson's rule for 2-machine scheduling, the sequence is: Six jobs are to be processed through a two-step operation. The first operation involves sanding, and the second involves painting. Processing times are as follows: Scheduled Order Job Operation2 (hours) Job (hours) 12 14 10 For the schedule developed using Johnson's rule, the total length of time taken to complete the six jobs (including the 2nd operation)-hours (enter your response as a whole number)

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