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Tombro Industries is in the process of automating one of its plants and developing a flexible manufacturing system. The company is finding it necessary to
Tombro Industries is in the process of automating one of its plants and developing a flexible manufacturing system. The company is finding it necessary to make many changes in operating procedures. Progress has been slow, particularly in trying to develop new performance measures for the factory.
In an effort to evaluate performance and determine where improvements can be made, management has gathered the following data relating to activities over the last four months:
Month
Quality control measures:
Number of defects
Number of warranty claims
Number of customer complaints
Material control measures:
Purchase order lead time days days days days
Scrap as a percent of total cost
Machine performance measures:
Machine downtime as a percentage of availability
Use as a percentage of availability
Setup time hours
Delivery performance measures:
Throughput time
Manufacturing cycle efficiency MCE
Delivery cycle time
Percentage of ontime deliveries
The president has read in industry journals that throughput time, MCE, and delivery cycle time are important measures of performance, but no one is sure how they are computed. You have been asked to assist the company, and you have gathered the following data relating to these measures:
Average per Month in days
Wait time per order before start of production
Inspection time per unit
Process time per unit
Queue time per unit
Move time per unit
Required:
a Compute the throughput time for each month.
b Compute the manufacturing cycle efficiency MCE for each month.
c Compute the delivery cycle time for each month.
a Refer to the inspection time, process time, and so forth, given for month Assume that in month the inspection time, process time, and so forth, are the same as for month except that the company is able to completely eliminate the queue time during production using Lean Production. Compute the new throughput time and MCE.
b Refer to the inspection time, process time, and so forth, given for month Assume that in month the inspection time, process time, and so forth, are the same as in month except that the company is able to eliminate both the queue time during production and the inspection time using Lean Production. Compute the new throughput time and MCE.
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