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A short class with Sarah and her students. The other ways are under More.
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Welcome, everyone! Today, we'll explore how different configurations of scrapers and pushers impact productivity. Can anyone tell me what happens if there are too few scrapers?
If there are too few scrapers, the pusher might have to wait, which could slow down productivity.
Exactly! The pusher becomes idle if there aren’t enough scrapers. When we have 5 scrapers, for instance, the production rate depends heavily on their availability. Can anyone help me recall the production formula we used?
It was based on the efficiency, number of scrapers, and volume per load, right?
Yes! The formula is: Production = (Efficiency * Number of Scrapers * Volume per Load) / Cycle Time. Great work!
Let’s do a quick calculation. What is the production rate for 5 scrapers if we use a bowl volume of 19.82 bank cubic meters?
If the cycle time is 7.78 minutes and the efficiency is 50 minutes per hour, we can calculate it!
Right! This gives us a production rate of 636.89 bank cubic meters per hour. Now, what happens if we add a sixth scraper?
Then the production rate increases to 723.36 cubic meters, showing a higher productivity rate.
Exactly! Although more scrapers increase productivity, we also need to consider cost.
Now, let’s discuss costs. What did we find out regarding the unit production cost for the scrapers?
The cost for 5 scrapers was ₹44.12 per cubic meter, while it rose to ₹45.07 for 6 scrapers.
Exactly! This illustrates that while productivity may increase with more scrapers, costs can also rise, impacting overall project economics.
So, choosing the right number of scrapers is crucial for balancing productivity and costs!
Well summarized! Always remember the balance between productivity and cost.
Scrapers five, they work in a hive, pushing and pulling, making us thrive.
Imagine a construction site, where scrapers and pushers unite. Five scrapers toil, while a pusher can smile, waiting to assist, making the job worthwhile.
Remember SPCC: Scraper Production Cost Control - to guide on scraper usage and cost efficiency.
SCOPE: Scraper Control Over Production Efficiency, an acronym to recall the balance needed.
Term
Production Rate for 5 Scrapers
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Term
Unit Production Cost
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A type of equipment used for earthmoving, capable of loading, hauling, and dumping materials.
A machine that assists in pushing scrapers to enhance loading efficiency.
The amount of material produced in a given time frame, commonly expressed in bank cubic meters per hour.
The total costs incurred to produce a unit of output, measured in cost per bank cubic meter.
A measure of how effectively a machine performs its intended tasks, often expressed as a percentage.
This section discusses techniques for optimizing the use of scrapers and pushers, emphasizing the balance required for efficient production and rolling resistance reduction.
The section elaborates on the importance of balancing the number of scrapers and pushers to achieve maximum productivity while minimizing the production costs. It highlights calculations needed to estimate production rates and costs for configurations with varying numbers of scrapers, focusing on optimizing operational efficiency.
In this section, we analyze the economics of utilizing 5 and 6 scrapers with a single pusher, discussing the impact of varying numbers of scrapers on productivity and unit production costs. As the number of scrapers increases beyond the balanced number, the control shifts from scrapers to the pusher, affecting cycle times and operational efficiency. Detailed calculations are provided to derive the production rates in bank cubic meters per hour, revealing that increasing the number of scrapers generally increases productivity up to a point where cost considerations must also be factored in. The comparison of costs per bank meter cube between different configurations shows that 5 scrapers yield a lower cost compared to 6. The section concludes with insights into the most effective use of scrapers for enhanced productivity.