In the hand simulation of the simple processing system, suppose the drill press

is taken down for burn-in maintenance at time 4 minutes, and it takes 4 minutes to do

this work and bring it back up; it then stays up for the rest of the 20-minute simulation

length. If theres a part in service when the drill press goes down, it just sits there,

its processing suspended until the drill press comes back up, when its resumed and

needs just its remaining processing time (its processing does not have to start over from

scratch). During the down time, the arrival process of new parts continues without re

gard to down time. Regard the drill press as being busy when its down, and defi ne the

time in system of a part to include the time it sits in the drill press but not being worked

on if its unlucky enough to be in service when the drill press is taken down. Using the

same input data as in Table 2-1 , carry out this simulation by hand and note any differ

ences in the output performance measures from the original model. (See Exercise 6-18

for the question of whether this model change induces statistically signifi cant changes

in the output performance measures.)