Problem 8: The ACE Machine Company is considering using a prority scheduling rule in its fabrication shop and must decide whether to use: the critical ratio rule, the order slack rule, the shortest operation next rule, or the slack per operation rule. The following table shows the company's current inventory and shop status. Order Number Manufacturing Lead Time Remaining Time Remaining Until Due Date Current Operation Processing Time Total Number of Processing Operations Remaining Time Remaining 1 15 7 2 3 8 2 15 11 3 4 3 20 -2 5 2 8 4 15 -5 4 3 8 5 15 3 1 12 8 Note Time i and the length of tim a) State the formula for calculating the priority index for each of sequencing rules given previously. b) Compute the scheduling priority for each order, four sequencing rules.

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a) Critical Ratio =
Order Slack =
Shortest Operation next =
Slack per Operation =
b) Priority Index Calculations:
Rule
Critical Ratio
Order Slack
Shortest Operation
Slack per Operation
Resulting Priority Sequences:
Rule
Critical Ratio
Order Slack
Shortest Operation
Hint: It is convenient to enter the data in a table, before doing the calculations
Problem 8: The ACE Machine Company is considering using a prority scheduling rule in its
fabrication shop and must decide whether to use: the critical ratio rule, the order slack rule,
the shortest operation next rule, or the slack per operation rule. The following table shows
the company's current inventory and shop status.
Order #
Manufacturing
Lead Time
Remaining
Time
Remaining
Until Due
1
2
Order
3
Date
Current
Operation
Processing
Time
# of
Operations
Remaining
Total
Processing
Time
Remaining
Manufacturing
Order
Number
Lead Time
Remaining
Time
Remaining
Until
Due Date
Current
Operation
Processing
Time
Number of
Operations
Remaining
Total
Processing
Time
Remaining
1
15
7
2
3
8
4
5
1
15
7
2
3
8
2
15
11
3
4
8
2
15
11
3
4
8
3
20
-2
5
2
8
3
20
-2
5
2
8
4
15
-5
4
3
8
4
15
-5
4
3
8
5
15
3
1
12
8
5
15
3
1
12
8
Order to
run next
Slack per Operation
Enter the order number (1,2,3,4, or 5) to run next for each dispatching rule.
Note: Time is measured in days. Manufacturing lead-time remaining includes both the machine processing time and the length of time
orders spend moving and waiting to be processed in a machine queue. Current operation processing time (as well as total processing time
remaining) includes no move or queue times.
a) State the formula for calculating the priority index for each of sequencing rules given
previously.
b) Compute the scheduling priority for each order, four sequencing rules.
Transcribed Image Text:a) Critical Ratio = Order Slack = Shortest Operation next = Slack per Operation = b) Priority Index Calculations: Rule Critical Ratio Order Slack Shortest Operation Slack per Operation Resulting Priority Sequences: Rule Critical Ratio Order Slack Shortest Operation Hint: It is convenient to enter the data in a table, before doing the calculations Problem 8: The ACE Machine Company is considering using a prority scheduling rule in its fabrication shop and must decide whether to use: the critical ratio rule, the order slack rule, the shortest operation next rule, or the slack per operation rule. The following table shows the company's current inventory and shop status. Order # Manufacturing Lead Time Remaining Time Remaining Until Due 1 2 Order 3 Date Current Operation Processing Time # of Operations Remaining Total Processing Time Remaining Manufacturing Order Number Lead Time Remaining Time Remaining Until Due Date Current Operation Processing Time Number of Operations Remaining Total Processing Time Remaining 1 15 7 2 3 8 4 5 1 15 7 2 3 8 2 15 11 3 4 8 2 15 11 3 4 8 3 20 -2 5 2 8 3 20 -2 5 2 8 4 15 -5 4 3 8 4 15 -5 4 3 8 5 15 3 1 12 8 5 15 3 1 12 8 Order to run next Slack per Operation Enter the order number (1,2,3,4, or 5) to run next for each dispatching rule. Note: Time is measured in days. Manufacturing lead-time remaining includes both the machine processing time and the length of time orders spend moving and waiting to be processed in a machine queue. Current operation processing time (as well as total processing time remaining) includes no move or queue times. a) State the formula for calculating the priority index for each of sequencing rules given previously. b) Compute the scheduling priority for each order, four sequencing rules.
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