Group-technology Machine Sequence Using the Hollier Method
A GT cell has four machines: 1, 2, 3, and 4. An analysis of 50 parts processed on these machines has been summarized in the from–to chart in Table 18.7.
Additional information: 50 parts enter the machine grouping at machine 3, 20 parts leave after processing at machine 1, and 30 parts leave machine 4 after processing.
Determine the most logical machine sequence using the Hollier method.

Question

Table 18.7 From–To Chart for Example 18.2
To
From	1	2	3	4
1	0	5	0	25
2	30	0	0	15
3	10	40	0	0
4	10	0	0	0

Accepted Answer

Summing the “From” trips and “To” trips for each machine yields the “From” and “To” sums in Table 18.8. The from–to ratios are listed in the last column on the right. Arranging the machines in order of descending from–to ratio, the machines in the cell should be sequenced as follows:

3→2→1→4

Table 18.8 From–To Sums and From–To Ratios for Example 18.2
To
From	1	2	3	4	“From” sums	From–to ratio
1	0	5	0	25	30	0.60
2	30	0	0	15	45	1.0
3	10	40	0	0	50	∞
4	10	0	0	0	10	0.25
“To” sums	50	45	0	40	135

Question 18.2: Group-technology Machine Sequence Using the Hollier Method A...

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