Problem: The following historical time between failure and repair time for a certain punch press is available. The machine was installed in the month of June after an appropriate burn-in period. The first breakdown happened on August 5, after 221 hours of use.
|
Date
|
8/5
|
11/6
|
12/19
|
2/7
|
3/30
|
|
# of hrs of use before breakdown
|
221
|
335
|
190
|
250
|
284
|
|
# of hours spent on repair
|
12
|
18
|
16
|
10
|
14
|
1. Compute the mean time between failure (MTFB)
2. Compute the mean time to repair (MTTR)
3. Compute the availability of the machine