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Drill bit size 0.0135 0.0160 0.0225 0.0350 0.0520 0.0700
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Total machine time 16.80 12.00 7.20 2.85 1.50 0.60 40.95
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TABLE B Drill Bits l Drill bit size 0.0135 0.0160 0.0225 0.0350 0.0520 0.0700 m Cost per new tool $1.25 $1.20 $1.15 $1.15 $1.15 $1.30 n Cost per repoint $0.25 $0.25 $0.25 $0.25 $0.25 $0.25 o Number of repoints per tool 2 2 3 3 4 4 p Total cost per drill bit life $1.75 $1.70 $1.90 $1.90 $2.15 $2.30 q Number of uses per drill bit life 3 3 4 4 5 5 r Average cost per drill bit use $0.58 $0.57 $0.48 $0.48 $0.43 $0.46 s Total number of drilled hits 420,000 300,000 187,500 90,000 48,000 15,000 t Number of hits per drill bit use 1,000 1,000 1,250 1,500 2,000 2,500 u Total number of drill bit uses 420.0 300.0 150.0 60.0 24.0 6.0 v Total drill bit cost $245.00 $170.00 $71.25 $28.50 $10.32 $2.76 $527.83
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TABLE C Entry and Backup Material w Cost per ft2 $0.53 $0.65 x Stack size ft2 3.00 3.00 y Cost per stack* $1.59 $0.98 z Total number of drilled stacks 60 60 aa Total material cost $95.40 $58.50 $153.90
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TABLE D
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Labor and Burden ab Cost per hour ac Cost total $614.25 $409.50 $1,023.75
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Material type Entry material Backup material
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* Backup material = cost/2 (uses per panel)
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TABLE E Total Costs Cost variable Drill bits Entry material Backup material Labor Burden Total drilling cost Cost per panel $4.40 $0.80 $0.49 $5.12 $3.41 $14.21 Total cost $527.83 $95.40 $58.50 $614.25 $409.50 $1,705.48 % of total 30.9% 5.6% 3.4% 36.0% 24.0% 100.0%
TABLE F
Drilling Costs $14.21 $0.804
Drilling cost per panel Average cost per 1000 holes
FIGURE 24.11 Drilling cost analysis matrix. (Courtesy of LCOA Technical Center.)
PRINTED CIRCUITS HANDBOOK
Drill Bits The cost of the drill bits needed to complete the job may be determined after the average cost per drill bit use has been calculated. To find the average cost per drill bit use, the typical number of repoints for the particular size (o) is multiplied by the cost of each repointing (n). The resulting cost, added to the new drill bit price (m), is the cost per drill bit life (p). By dividing the cost per life by the number of uses (q) per life (the number of times the bit is repointed + 1), you arrive at the average cost per drill bit use (r). Next, by dividing the total number of hits per drill size (s) by the number of maximum hits per drill bit use (t), the number of required drill bit uses (u) for each size may be determined. Then calculate the total cost per drill bit size (v) by multiplying the number of uses (u) by the average cost per use (r). The sum of the total costs of each of the drill bit sizes (v) brings you to the total cost of drill bits needed for the job. This cost, of course, is true only with the assumption of no drill bit breakage.
24.7.3 Entry and Backup Materials Entry and backup material cost per stack (y) is determined by multiplying the stack size (square foot per panel [x]) by the cost per square foot. Remember to divide the backup cost by 2 since each backup panel may be used twice. Total material cost (aa) is calculated by multiplying cost per stack (y) by total number of drilled stacks (z).
24.7.4 Burden and Labor Using typical burden and labor rates per hour (ab), these values are multiplied by the number of hours to complete the job (determined in Table A) in order to calculate the total burden and labor costs (ac).
24.7.5 Total Drilling Cost and Cost per Hole After entering the required data in Tables A through D of Fig. 24.11, the total drilling cost and the cost distribution (see Table E) as well as the drilling cost per panel and the cost per hole (see Table F) can be calculated. Because the cost per hole typically ranges around 1/10 of a cent, a more accurate and easier way to comprehend this value is by showing the average cost per 1000 holes, as is done in the cost model.
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