A batch of 35 parts is ordered by a customer about every six months. The parts are currently processed sequentially through five conventional machines, listed in the following table with setup times and work cycle times per piece. These machines all require an operator to be in attendance during the work cycle. There is a delay of 10 hr/machine due to transport between machines and waiting in queues of other parts processed by these machines. A recommendation has been made to process the parts on a new multitasking machine that would complete the batch in one setup, which would involve a simple fixture and a setup time of 2.0 hr. The work cycle on the multitasking machine consists of the same operations that are accomplished by the five machines, but the cycle time would be less than the sum of the five cycle times by one-half because of tool path improvements and reduced part handling. Determine the manufacturing lead time (how long it takes to complete the batch of 35 parts, including delays) for processing on (a) the five conventional machines and (b) the multitasking machine. Assume that a delay of 10 hr would occur for the multitasking machine due to other work on that machine.
A batch of 35 parts is ordered by a customer about every six months. The parts are currently processed sequentially through five conventional machines, listed in the following table with setup times and work cycle times per piece. These machines all require an operator to be in attendance during the work cycle. There is a delay of 10 hr/machine due
to transport between machines and waiting in queues of other parts processed by these
machines. A recommendation has been made to process the parts on a new multitasking
machine that would complete the batch in one setup, which would involve a simple fixture
and a setup time of 2.0 hr. The work cycle on the multitasking machine consists of the
same operations that are accomplished by the five machines, but the cycle time would be
less than the sum of the five cycle times by one-half because of tool path improvements
and reduced part handling. Determine the manufacturing lead time (how long it takes to
complete the batch of 35 parts, including delays) for processing on (a) the five conventional
machines and (b) the multitasking machine. Assume that a delay of 10 hr would occur for
the multitasking machine due to other work on that machine.
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