Question

5. What was the ratio of actual processing time for the product to total lead time?

1075 International Journal of Prodiction Resecarch Project Management 90,60 30 days forecast End Customers Hyerson Steel Weekly Schedule Dally Shipping Schedule Welding Finishing Assembly Wiring Fabrication 23 days CIT-140.5mn PIT-250 min C/T 126min days CT-128min PIT-480 min CIT 120 Ave CIT 120 CIO 15 days 3 days 3 days 3 days 1 days L. T. 25 days 480 min 2400 min IP.T. 3158.5 min 140.5 min 250 min 128 min Figure 3. Current value stream map Operation time (min) 15 Name of Manual Machine ime 25 50 100 125 150 5 10.5 Manual operation Machine processing- Shear 52 57 2Pasma Unload 2 42 Waiting 59 74 101 116 Debur 15 6 985 118 140.5 22.5 Figure 4. Standard operation routine sheet for fabrication operation. Since the time it requires to plasma cut the first work piece is longer than what is required for the operator to shear the other five pieces, there is a 14.5 minute period in which the operator has nothing to do, as shown in Figure 4. Upon the completion of plasma cutting the first work piece, the operator sets up the plasma cutter for the second work piece and then begins plasma cutting the second piece. The operator then takes the first work piece to the de-burring and braking processes. After completing the de-burring and braking processes, the operator walks back to the plasma cutter to pick up the second work piece in order to begin to de-burr and brake it. After the second work piece has gone through all four processes, fabrication for the switchboard is complete The cycle time of fabrication operation is 140.5 min, which is longer than the cycle times of the other operations. In addition, quality problems were found in the fabrication operation, mostly at the plasma cutter which only has about a 90% uptime capability.

Answer 1

Answer:

Lead time clock starts when the request is made and ends at delivery. Cycle time clock starts when work begins on the request and ends when the item is ready for delivery. Cycle time is a more mechanical measure of process capability. Lead time is what the customer sees.

Lead time depends on cycle time, but also depends on your willingness to keep a backlog, the customer’s patience, and the customer’s readiness for delivery.:

cycle time measures the completion rate, lead time measures the arrival rate. A producer has limited strategies to influence lead time. One is pricing (managing the arrival rate), another is managing cycle time