Blade adjustment factor 100 table 72 step 10 grade

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Blade adjustment factor1.00Table 7.2Step 10Grade correction 5%0.90Table 7.2Step 11Product of correction factors0.347
7.10A contract is being bid to clear and grub600 acres. You are considering the cost associated with using a 460 -hp dozer.The dozer’s O&O cost is$145.00 per hourThe wage determination for operators is$29.00 per hr30% fringesProject overhead will run$600.00 per workday.Assume a10 -hr workdayThe site is reasonably level and the machines will have no problem with bearing or traction. About80% of the trees are pines (softwood) and the rest are oak (hardwood). The total number of trees per acre is about500 of that number N1180trees per acre are 1 to 2 ft in diameteN240 trees per acre are 2 to 3 ft in diameterN330 tree per acre is 3 to 4 ft in diameterBurning will require that the dozer be employed 2the time expected for piling-upa. What is the estimated clearing and grubbing production rate?Production factorsNo. of trees460 hp felling460 hp pilingH0.70A1.00B15.7939.27M11800.100.08M2400.400.10M3301.301.20M403.002.10F01.000.30
Felling productionH[A(B)+ M1N1 + M2N2+ M3N3 + M4N4+DF] 0.7015.79181639000.70×88.79=62 min/acreTime =62×600=622 hours60 min/hrBecause of grubbing increase by25%155777 hoursPilling upB + M1N1 + M2N2+ M3N3 + M4N4+DF =94min/ac39.2714.443600Time =94×600=937 hours60 min/hrBecause of grubbing increase by25%2341171 hoursAdjust for burning1171×2=2342 hoursTotal timefell 777 hourspile & burn 23423119 hoursor3119312 days10a. Production rate600=0.192 acres/hr3119b. What is the cost associated with the total operation, including overhead,when only1460-hp dozer is used?Cost to operate the dozerO&O =$145.00 /hrOperator =$29.00 /hrfringes @30%$8.70 /hrTotal$182.70 /hrDozer cost$569,779.643119 hr =311.9days10 hr/day

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