A crawler hoe with a 2 1/4-cy bucket and whose cost per hour, including the wages to an operator, of $67, will excavate and load haul units under each of the stated conditions. The maximum digging depth of the machine is 20 ft. Determine the cost per bank cubic yard for each condition. (Condition 1. 300 bcy/hr, $0.223/bcy; Condition 2. 319 bcy/hr, $0.210/bcy; Condition 3. 128 bcy/hr, $0.523/bcy)
Condition | (1) | (2) | (3) |
Material | Moist loam, earth | Sand and gravel | Rock, well blasted |
Depth of excavation (ft) | 12 | 16 | 14 |
Angle of swing (degrees) | 60 | 80 | 120 |
Percent swell |
| 14 |
|
Efficiency factor (min-hr) | 45 | 50 | 45 |
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