# Extra Credit Opportunity Excavators_ Shovels_ Draglines_ Hoes_ and Clamshells

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```					     Extra Credit Opportunity
Excavators, Shovels, Draglines, Hoes,
and Clamshells
02/07/2012
1.   Part 1 - Excavator Problem
Find cycles/hr, swing-depth factor, and heaped volume for a large
excavator
Heaped bucket capacity is 3 CY.
The material is rock with a bucket fill factor of 0.50.
Job efficiency is 50 min/h.
Average depth of cut is 10 ft.
Maximum depth of cut is 20 ft.
Average swing is 90.

A little help…..
1.   Part 1 - Excavator Problem
Find cycles/hr, swing-depth factor, and
heaped volume for a large excavator
Heaped bucket capacity is 3 CY.
The material is rock with a bucket fill factor
of 0.50.
Job efficiency is 50 min/h.
Average depth of cut is 10 ft.
Maximum depth of cut is 20 ft.
Average swing is 90.
1.    Part 1 - Excavator Problem
Find cycles/hr, swing-depth factor, and
heaped volume for a large excavator
Heaped bucket capacity is 3 CY.
The material is rock with a bucket fill factor
of 0.50.
Job efficiency is 50 min/h.
Average depth of cut is 10 ft.
Maximum depth of cut is 20 ft.
Average swing is 90.

Cycles/hr = 100 cycles/hour
Swing-depth factor = 1.10
Heaped volume = 3 LCY
2.   Part 2 - Excavator Problem
Find the bucket fill factor, job efficiency, and production for a large
excavator.
Heaped bucket capacity is 3/4 CY.
The material is rock with a bucket fill factor of 0.50.
Job efficiency is 50 min/h.
Average depth of cut is 10 ft.
Maximum depth of cut is 20 ft.
Average swing is 90.

A little help…..
2.   Part 2 - Excavator Problem
Find the bucket fill factor, job efficiency,
and production for a large excavator.
Heaped bucket capacity is 3 CY.
The material is rock with a bucket fill factor
of 0.50.
Job efficiency is 50 min/h.
Average depth of cut is 10 ft.
Maximum depth of cut is 20 ft.
Average swing is 90.
2.   Part 2 - Excavator Problem
Find the bucket fill factor, job efficiency,
and production for a large excavator.
Heaped bucket capacity is 3 CY.
The material is rock with a bucket fill factor
of 0.50.
Job efficiency is 50 min/h.
Average depth of cut is 10 ft.
Maximum depth of cut is 20 ft.
Average swing is 90.

Bucket Fill Factor = 0.50
Job Efficiency = 50/60 = 0.833
Production = 100 cycles/hour X 1.10 X 3LCY X 0.50 X (50/60) = 137.5 LCY/hr
3.   Which operation best suits a shovel or an
excavator? Fill in the blank

• Digging at or above the tracks or tires is best
for a(n) ____________.

• Digging below the tracks or tires is best for
a(n) _____________.
3.   Which operation best suits a shovel or an
exavator? Fill in the blank

• Digging at or above the tracks or tires is best for a
shovel.

• Digging below the tracks or tires is best for an
excavator.

• WHY?
4.   In general when estimating efficiency, the amount
of effective work in an hour is typically assumed
to be…

A.   60-min/hour
B.   45-min/hour
C.   50-min/hour
D.   40-min/hour
4.   In general when estimating efficiency, the amount
of effective work in an hour is typically assumed
to be…

A.   60-min/hour
B.   45-min/hour
C.   50-min/hour (0.833 efficiency)
D.   40-min/hour
5.  Which crane-shovel piece of equipment
has the longest reach for digging and
dumping?
EITHER

Clamshell            OR          Dragline
5.  Which crane-shovel piece of equipment
has the longest reach for digging and
dumping?
EITHER

Clamshell            OR          Dragline

```
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