Question

9.10 For each of the stated conditions, determine the probable production expressed in cubic yards per hour bank measure for a shovel equipped with a 5-cy bucket. The shovel has a maximum digging height of 34 ft. Use a 50-min-hour efficiency factor but be aggressive with the assumed fill factor. Class of material Shot rock, poorly blasted Shot rock, well blasted Condition Height of excavation (ft) 23.8 17 Angle of swing (degrees) 75 120 Loading haul units yes yes

Answer 1

W Given that comes for each of the stated conditions, de termine the Probable production expressed in Cubic younds per hour Sol - Slap - - shot rock poorly blasted on Calculating show production cycle times for 3-5cy size shovels Lood bucket - 7-98cc swing with load = 4-6 sec Dump load = 2-4 sec Rotum swing = 4-5 sec Size of bucket : 59 Bucket fill factor = 80-90%. 801) Every hard digging) Cycle time = 9+6+4+5 : 2455 Avropa haight of ex cauation = 23.8ft optimum fight = 65 x 34 = 1444 Parcent optimum height = 29,8 x 100 14 = 140% correcting for height and swing Percentage of optimum depth Angle of swing Cologrons) ..4561 60 ° / 750 900 14001 1509 140 12 61.061.0-9110818 0.13 for angle of sowing 750, coaction for height of cut and angle of Świng 40.94

et Aliciang factor = so min - hous Production = 3600 Sec XQxFxCAS:D) x E x y voicom t 60-minhr o= heaped bucket Capacity (day) fa Bucket fill factor Asid : angle of sooing and depth of cut connection t = Cycle time in sec t or and €: efficiency (min/he) Volume Correction = 1 I+Swey factor and Schly-factor for rock anll blasted = 0,63 Production = 3600 X3 X 08x0,97 x 50 x) = 485 Iglhr Slap2 :- shake rock call blasted: Size of bucket = 56 Bucket -lill factor = 0.8 Cyck time = 24.5 hough of ex cauation = 19.84 optimum height = 0.5X34 = 1444 Percent optimum height = 194*100 = 100% Comecting for height and swing 24 24 60 1+0

Parcantage of R Angle of soing ro) optimum height 450 | 600 750 / 900 / 120° 11500 180° - 1.26/1.16 11:07 1.000.88 0.7 l o. Angle osseoing = 1200, correction = 0.88 Efficiency factor = 50 min-her Production = 3600 X 5x0.8 X0.88 x 50 x 24 60 +0.63 = 269.94 leylhr