2.2.3. Shuttle Loading

Try these first

1. 1.

   What is cycle time?

   Hint

   Think about all the tasks it performs.

2. 2.

   Define fixed time in cycle time.

   Hint

   Which part of the timing is consistent regardless of distance?

3. 3.

   What is included in the cycle time of a scraper?

   • Only loading and dumping time
   • Loading
   • hauling
   • dumping
   • return
   • etc.
   • Only hauls and returns

   Hint

   Think of all tasks the scraper completes during its operation.

4. 4.

   True or False: All cycle time components are variable.

   • True
   • False

   Hint

   Consider which times depend on distance.

5. 5.

   A scraper has a fixed loading time of 0.8 min, increased resistance when over 85% loading leads to an effective new loading time of 1.5 min after that point. Calculate the difference in cycle time if loading 90% payload is attempted.

   Hint

   Consider the totality of the cycle time when calculating efficiencies.

6. 6.

   Given varying haul route conditions affecting machine speed, calculate the haul time if the distance is 200 meters and average speed is 10 m/s. Adjust for resistance factors diminishes speed to 7 m/s.

   Hint

   How do different speeds impact the time taken to cover the same distance?