Page 452 - Orlicky's Material Requirements Planning

430 PART 4 Looking Backward and Forward

FIGURE 25-10

Part ramp-up
1000 100
example.
900 90
800 80
Zone Levels 600 60 Average Daily Usage
700
70
50
500
400
300 40
30
200 20
100 10

Effectivity Date

a buffer profile and zone strategy that also grows over time. The buffer can be adjusted
based on the real performance against that plan.
In the part ramp-down example (Figure 25-11), a part that is being discontinued is
displayed. The far right of the figure represents the date at which the part is planned to
be inactive (the “effectivity” date). The ADU is ramped down to create a gradually dimin-
ishing buffer level and zone definition.
Figure 25-12 incorporates both ramp-down and ramp-up adjustments. In this case,
the new part (on the right) is obsolescing the old part (on the left). The old part is allowed
to drain off as the new part is being ramped up to a full ADU-buffered position that coin-
cides with the old part’s “effectivity” date. In this case, if there is a spike that will deplete
the old part’s buffer at a faster than planned rate, the new part has stock to cover that
demand.

FIGURE 25-11
Part ramp-down 1000 100
example.
900 90
800 80
Zone Levels 600 60 Average Daily Usage
700
70
50
500
400
30
300 40
200 20
100 10

Effectivity Date