3.2. Lifting Capacity and Operating Radius

Try these first

1. 1.

   What is the angle of swing?

   Hint

   Think about the horizontal swing of the excavator's bucket.

2. 2.

   Define cycle time.

   Hint

   Consider how long it takes for the excavator to complete its task.

3. 3.

   What effect does a swing angle greater than 90 degrees have on cycle time?

   • Increases cycle time
   • Decreases cycle time
   • No effect

   Hint

   Consider how distance affects travel time.

4. 4.

   True or False: The ideally positioned truck adds no correction factor to productivity calculations.

   • True
   • False

   Hint

   What is the ideal condition to remember?

5. 5.

   If the ideal swing angle is maintained at 70 degrees while the height of cut is 3 meters and optimal height is 5 meters, determine the correction factor based on hypothetical values from a provided chart.

   Hint

   Check the values provided in the textbook or table for specifics.

6. 6.

   A shovel operates with a heaped bucket volume of 4 cubic meters and takes 30 seconds per cycle. If it works efficiently for 50 minutes, calculate its potential output using the given formula and considering an efficiency percentage.

   Hint

   Remember to adjust the figure for the time worked effectively.