2.3. Excavating Below Ground Level

Try these first

1. 1.

   Define the term 'Cycle Time'.

   Hint

   Think about how long it takes for the whole process to repeat.

2. 2.

   What is an ideal angle of swing for trucks relative to the excavator?

   Hint

   It's the angle that provides maximum efficiency.

3. 3.

   What happens to productivity when the angle of swing exceeds 90 degrees?

   • Productivity increases
   • Productivity decreases
   • No change

   Hint

   Think about how much distance the bucket would need to travel.

4. 4.

   True or False: The optimum height of cut should always be higher than the actual height of cut.

   • True
   • False

   Hint

   Consider the relationship between ideal and actual measurements.

5. 5.

   If a site has an actual height of 4.5 meters while the optimum is 7 meters, calculate the productivity percentage. What adjustment should be made?

   Hint

   Use the formula for calculating the percentage.

6. 6.

   You’ve found a swing angle of 100 degrees at your worksite. How would this affect your productivity calculations?

   Hint

   Consider how much work the excavator can do at this increased angle.