Blem 1. 60 points Gage blocks must be lapped for flatness and parallelism. Cluster of identical CNC lapping machines are available. Both sides of a block are lapped at a time; the lapping wheels are large enough to cover all gage blocks regardless of their lengths. Calculate the number of CNC lapping machines if we want to maximize the machine time by having only one single operator per cluster.  Machine availability: 85% (15% time for maintenance)  Rejection rate: 4%  Lapping time per block: 20 minutes  Time to walk between machines: 30 sec  Loading/unloading time: 90 sec

a. 22.30 machines required

b. 22.22mm

c. 11 machines

Explanation:

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Complete Question

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The number of CNC machine required is  

Explanation:

From the question awe are told the

         The machine availability is   85%

           The  Rejection time is  4%

           The lapping time is 20 minutes

         The  time to work between machines is  

          The loading and unloading time

For one the loading and unloading time would be

 Substituting values

for the 8 different sizes of the block the loading and unloading time would be

From the the target is given as

The available time is given as

The quantity of sets of block to be lapped by one machine per week would be

                   %

                    sets

Hence

    The number of CNC lapping machine would be

answer:

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explanation: