Unformatted text preview: be greater than the savings from the resulting increase in P. • The location of the knee of the curve is related to the MTTR of the two machines. It will be somewhere around (small integer)•MTTR, where a greater variance of MTTR leads to a bigger integer number. • If the first machine is slower (e 1 <e 2 ), the average number of parts in the buffer ( n ) will be small (see right figure on slide 43). Therefore the buffer size is determined by the need to keep machine 1 running while machine 2 is down (the buffer has to be big enough to absorb the output of machine 1 for the downtime of machine 2). For a smaller r 2 (big MTTR 2 ) a bigger buffer is needed. • If the second machine is slower (e 1 >e 2 ), the buffer has to be large enough to provide the parts to keep machine 2 running while machine 1 is down (N ≈ (small integer)•MTTR 1 ). Increasing the buffer size further increases the average number of parts in the buffer without adding any value....
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- Spring '04
- Addition, optimal buffer size