Question

The two excavators have a 14 second cycle time using a 0.8 cubic yard bucket. They are 15 cubic yard trucks that have a loading mp-return-maneuver time of 33 minutes. The excavator cost is $23 excavators, determine the fleet of trucks that provides the best production and the fleet of trucks that provides the cheapest production. Show all work and indicate final answer. S/hr and the trucks cost $80/hr. Assuming a 50 minute efficiency hour and two

Answer 1

Shovel bucket capacity = 1.25 yard^3 cycle time = 40sec. for 1 hour operation: total excavated volume = (1.25) times 3600/40 = 112.5 yard^3 so, cycle time of 1 housing truck = 10 min in 1 hour no. of cycles = 60/10 = 6 therefore no. of cycles required to half 112.5 yard^3 implies 112.5/capacity of truck = 112.5/10 = 11.25 almostequalto 12. Therefore (no.of trucks) times 6 = 12 therefore no. of trucks required = 2. Productivity = 112.5 yard^3/hour.