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A short class with Sarah and her students. The other ways are under More.
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Today, we're discussing the concept of angle of swing. Can anyone tell me what happens to productivity if the truck is placed at an angle greater than 90 degrees?
I think productivity decreases as the angle gets larger?
That's correct! The larger the swing angle, the longer the cycle time, which directly impacts productivity. Remember, we want to keep it at 90 degrees when possible!
So having the truck really close to the excavator is the best way?
Exactly! Keeping the truck close minimizes the angle and keeps the cycle times short, thereby enhancing productivity. We can think of the acronym 'PACE'—Positioning And Cutting Efficiency.
What about when the angle is less than 90 degrees?
Good question! If the angle is less than 90 degrees, the correction factor actually increases, which can help improve productivity!
So, to summarize, we want an angle of swing around 90 degrees to keep our productivity high?
Exactly! Great recap, everyone.
Let's move on to the height of cut. Why is it important to maintain the actual height of cut similar to the optimum height?
If it’s not the same, it could lower productivity?
Exactly! If the actual height is less or greater than the optimum height, we need to apply correction factors which reduce productivity.
How do we calculate this percentage?
We take the actual height divided by the optimum height and multiply by 100. For example, if the actual height is 3.18 meters and the optimum height is 5.3 meters, what do we get?
That would be about 60%.
Correct! This is key because if the height is not optimal, we have to adjust downwards our productivity estimates.
Now, let's apply what we’ve learned by calculating productivity. What formula do we use?
Is it the bucket's heaped volume divided by cycle time?
Yes! We also need to adjust by the fill factor and any correction factors we discussed. If we have a bucket volume of 3.44 cubic meters, and the cycle time is 24 seconds, what is the ideal production per hour?
It’s...469.56 loose cubic meters per hour!
Fantastic! That’s the impact of correctly applying these factors. Always remember to keep job efficiency in mind too!
Refers to the maximum production capacity of a shovel when operating under perfect conditions, including 90-degree swing and optimal height of cut.
Adjustments applied to account for variances from ideal conditions to estimate real productivity.
The total time it takes to complete a loading cycle, significantly influencing productivity.
For the best swing, keep it at ninety, it makes loading feel quite light and plenty.
Imagine a truck and excavator at a perfect angle. Their dance is efficient, maximizing production with each swing.
Use 'SOAR' to remember: 'Swing Optimize Angle Ratio' for maximizing productivity.
PACE: Positioning And Cutting Efficiency shows how to enhance effectiveness in machinery operation.
Term
What is the purpose of a correction factor?
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Term
Define 'height of cut'.
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The horizontal angle between the digging and dumping positions of the bucket during excavator operation.
A numerical adjustment applied to productivity estimates based on the actual height of cut or swing angle.
The distance from the ground to the cutting edge of the bucket, which should ideally match the optimum height for optimal productivity.
The duration necessary for a loaded truck to leave and an empty truck to take its place for loading.
This section discusses the factors affecting productivity estimation in excavation operations, focusing on the relationship between truck positioning, swing angles, and height of cut.
The section examines the significance of various operational factors in the productivity estimation of shovels and discusses optimal angles for efficiency. Key topics include the influence of truck placement, the correction factors based on height of cut and angle of swing, and details on estimating shovel productivity.
In construction and excavation operations, productivity estimation is vital for planning and executing projects efficiently. This section outlines several key factors that significantly affect production rates, specifically focusing on the positioning of trucks relative to excavators, the angle of swing during operation, and the height of cut of the material being excavated.
Truck Placement: The proximity and positioning of trucks to excavators are crucial for optimizing cycle times. Ideally, trucks should be positioned at a 90-degree angle to the excavator's swing. As this angle increases beyond 90 degrees, productivity typically decreases due to longer cycle times.
Height of Cut:
Correction Factors:
Haul Unit Exchange Time: This refers to the time taken for a truck to drop off a load and return for another round. Minimizing this time is critical as waiting trucks can hinder productivity.
Calculating Productivity: The overall productivity can be calculated based on factors such as heaped bucket volume, cycle time, and adjusted for job efficiency, swing depth factor, and correction factors.
Through examples, this section provides insight into practical calculations for estimating shovel productivity, essential for anyone involved in planning excavation operations.