. . . Chapter 7 DOZER PRODUCTION EFFICIENCY GIVEN D9N Dozer (Fig. 7.14) Move 2000 LCY Distance - 400 ft. (Fig. 7.14) Gra

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: Chapter 7 Dozer Production Efficiency Given D9n Dozer Fig 7 14 Move 2000 Lcy Distance 400 Ft Fig 7 14 Gra 1 (49.96 KiB) Viewed 26 times

: Chapter 7 Dozer Production Efficiency Given D9n Dozer Fig 7 14 Move 2000 Lcy Distance 400 Ft Fig 7 14 Gra 2 (48.64 KiB) Viewed 26 times

: Chapter 7 Dozer Production Efficiency Given D9n Dozer Fig 7 14 Move 2000 Lcy Distance 400 Ft Fig 7 14 Gra 3 (54.17 KiB) Viewed 26 times

. . . Chapter 7 DOZER PRODUCTION EFFICIENCY GIVEN D9N Dozer (Fig. 7.14) Move 2000 LCY Distance - 400 ft. (Fig. 7.14) Grade -1% uphill (Table 7.2) Material - Loose stockpile (Table 7.2) • Operator Skills - Excellent (Table 7.2) • Actual Time Working - 50 min/hr (Efficiency) • Operator Technique-slot dozing (Table 7.2) • Visibility - N/A (Table 7.2) • Material Weight - 2100 lb/CY (standard weight is 2300. Divide 2300 by material weight to get the factor) • Transmission - Direct drive (Table 7.2) Dozer Blade - Straight blade - - - . D9N Book Efficiency (Fig. 7.14) X above factors = Actual Efficiency Factors: grade x material weight x operator x type material x operator technique x visibility x efficiency x transmission x type blade Efficiency x Factors = Actual Efficiency = = LCY/HR.
Table 7.2 TABLE 7.2 Caterpillar job condition correction factor for estimating dozor production Track-type tractor Wheel-type tractor Operator Excellent 1.00 1.00 Average 0.75 0.80 Poor 0.60 0.50 Material Looso stockpile 1.20 1.20 Hard to cut: frozen with tilt cylinder 0.80 0.75 without tilt cylinder 0.70 cable-controlled blade 0.80 Hard to drift; "dead" (dry, noncohesivo 0.80 0.80 material) or very sticky material Rock, ripped or blasted 0.50-0.80 Slot dozing 1.20 1.20 Side-by-side dozing 1.15-1.25 1.15-1.25 Visibility Dust, rain, snow, fog, or darkness 0.80 0.70 Job efficiency 50 min/hr 0.83 0.83 40 min/hr 0.67 0.67 Direct-drive transmission (0.1-min fixed time) 0.80 Bulldozer Adjust based on SAE capacity relative to the base blade used in the estimated dozing production graphs Grades- see the graph Grade vs. Dozing Factor e) Downhill (+) Uphill 1.8 1.6 1.4 1.2 10 08 0.6 2 30 --20 -10 0 -10 20 +30 iades and cushion blades are not considered production dozing tools. Depending on job blade and blade will average 50-75% of straight-blade production fety of Caterpillar
Chapter 7 DE Fig. 7.14 2100 3.000 2000 3.000 2100 1.100 3200 1.000 31000 1.400 1.800 KEY A-DIIN.IN -DIONTOU CONU D-ON E-DTH-TU FD7G-TU 1.000 1.300 1.400 1.000 1300 800 000 600 SOO 600 400 400 8 200 200 D 0 0 100 200 300 400 500 600 0 15 30 60 75 90 10320 35 150 165 150 195 m Average daring distance FIGURE 7.14 Dozing production estimating curves for Caterpillar D7 through 011 dozers equipped with universal blades Reprinted courtesy of Caterpillar loc (Ib per ct) in the bank state and is estimated to swell 12% when excavated (bank to loose state). Job efficiency is assumed to be equivalent to a 50-min hour. Calculate the direct cost of the proposed earthmoving operation in dollars per bcy. Assume that the owning and operating (O&O) cost for the dozer is $32.50 per hour and the operator's wage is 514.85 per hour. Step 1: Ideal Maximum Production Determine the ideal maximum production from the appropriate curve based on the particular dozer model and type of blade. Find the dozing distance on the bottom horizontal scale of the proper figure. Draw a vertical line upward until