5.1. Thumb Rule Formula for Cycle Time

Try these first

1. 1.

   What is back-track loading?

   Hint

   Think about how the pusher's movement influences loading time.

2. 2.

   How does chain loading improve cycle time?

   Hint

   Consider the distance traveled by the pusher.

3. 3.

   What method is considered the slowest for loading scrapers?

   • Chain Loading
   • Back-Track Loading
   • Shuttle Loading

   Hint

   Think about the return travel involved.

4. 4.

   True or False: Chain loading helps reduce cycle time.

   • True
   • False

   Hint

   Consider how the pusher interacts with multiple scrapers.

5. 5.

   In a scenario where scrapers have varying loading times of 5, 7, and 6 minutes respectively, calculate the average pusher cycle time using the thumb rule formula. Discuss how variations in loading times might impact operational efficiency.

   Hint

   Calculate each cycle time and average them to find the mean.

6. 6.

   Evaluate a construction site's efficiency if the pusher has 10 scrapers but can only realistically serve 4 due to its cycle time. Analyze possible alternatives to improve efficiency without increasing costs.

   Hint

   Consider how aligning the number of scrapers with the pusher's capabilities can reduce waiting times.