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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 going to learn how to determine haul time using performance charts. Can anyone tell me what haul time refers to in our context?
Isn't it the time it takes for a truck to transport materials from a site?
Exactly! Haul time depends on various factors including haul distance and speed, which we can derive from performance charts. Can anyone think of what factors might affect this speed?
Maybe the weight of the load or type of terrain?
And also the type of machine we're using!
Great points! The weight of the load does affect the machine's speed due to resistances encountered, and understanding these factors is vital for accurate haul time calculations.
So, let's remember the key formula: Haul Time = Distance / Speed. We will use performance charts to get the speed based on weight and resistances.
Now, let's talk about gravimetric capacity. Why is it crucial to know a machine's gravimetric capacity?
I think it’s to avoid overloading which could damage the machine?
Correct! Overloading can lead to increased wear and tear and particularly affect tires, which can constitute a significant portion of operating costs. Can you explain how we check if a load is within this capacity?
We need the weight of the load based on its density and volume, right?
Exactly! By calculating the actual weight using the material's density and the truck's volumetric load, we ensure that we remain within safety limits. Good job!
Next, let’s discuss dumping times. What factors can influence how quickly we can dump materials from a truck?
I think it depends on whether the material is sticky or not?
And how congested the dumping area is, right?
Absolutely! The material type and site conditions can significantly affect dumping efficiency. Remember, favorable conditions lead to quicker dumping times. Can anyone recall the types of trucks and their related dumping times?
There are rear dump and bottom dump trucks, and bottom dumps are usually faster under ideal conditions!
Well done! Balancing these conditions can really enhance overall speed and productivity.
Finally, let's talk about balancing our equipment. What does balancing the number of trucks and excavators involve?
It’s about making sure we have enough trucks for the excavators to keep work flowing, right?
Exactly! If we don't have enough trucks, the excavator may be idle. Ideally, how do we calculate the number of trucks needed?
By comparing the cycle times of trucks and excavators?
Right again! The balance number should ensure both machines operate at their maximum efficiency.
So remember, the optimum balance is crucial for maximizing production and minimizing downtime!
The time taken for a complete loading and transporting operation.
Safe operational load limit of a machine.
Time taken to complete a loading, haulling, or dumping operation.
Weight per unit volume, key to calculating truck load weights.
Ensuring the optimal number of machines to enhance productivity.
To haul your load in a truck that will go, keep it light so your tires won't slow.
Imagine a truck trying to carry twice its load and struggling uphill, remember, each load must stay within its allowed space.
LHD = Load, Haul, Dump - the main steps in haul time!
G-CAP = Gravimetric Capacity = Always Push less to avoid a crush!
Term
What is Haul Time?
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Term
What is Gravimetric Capacity?
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The total time required for a truck to transport materials from one location to another, including loading, hauling, dumping, and returning.
The maximum load weight that a machine can safely handle, as defined by the manufacturer.
The time required for a bucket to complete one full cycle of loading, hauling, or dumping.
The weight of a material per unit of volume, which is essential for calculating the total weight of a load.
The time taken to unload materials from a truck based on the type of dumping method and material conditions.
The process of ensuring the number of trucks and excavators work in harmony for optimal production.
This section focuses on calculating haul time using performance charts while emphasizing the importance of adhering to the gravimetric capacity of equipment.
In this section, we delve into the calculation of haul time based on bucket cycle times and the effects of various factors like load weight and type of materials. Key considerations include gravimetric capacity, loading and dumping times, and understanding how these influence productivity and equipment wear.
This section explains how to determine haul time, which is crucial for effective management of hauling operations. The basic formula for loading time is derived from the multiplication of the number of bucket loads by the bucket cycle time. Emphasis is placed on the gravimetric capacity of machines, defined as the maximum allowable load weight, and the need to ensure that the loaded material's weight does not exceed this limit.
Moreover, it discusses the implications of loading too much weight, particularly when using denser materials, as this can lead to increased wear and tear on the machine, particularly tires, which significantly affects operating costs. The need to check the unit weight of materials against the machine's capacity ensures safe and efficient operation.
The section also covers factors affecting dumping times such as material type, machine type (rear dump vs. bottom dump), and site congestion, with comparisons made between favorable and unfavorable conditions. Finally, the section lays out a systematic approach to balance the capacities of interdependent machines (trucks and excavators) for optimal productivity, including methods for calculating the number of trucks required based on cycle times.