4. Balancing Interdependent Machines

Another important thing you have to keep in mind is, for any machine whatever may be the mission we have discussed about different types of machines so far. All the machines we are concerned about the safe gravimetric capacity of the machine. For every machine what is this safe operating load in terms of weight is given by the manufacturer, so that we call it as a gravimetric capacity. So, only that capacity your machine can take because the structural frame of the machine is designed to handle that particular load only. Therefore, we are not supposed to load the machine beyond the gravimetric capacity.

Gravimetric capacity is a critical safety measure for machinery. It indicates the maximum weight that the machine can handle safely, as determined by its manufacturer. Each machine is engineered with a specific structural capacity, and exceeding this limit can cause damage or failure. It's essential to always operate within these limits to ensure safety and maintain the machine's longevity.

Think of gravimetric capacity like a backpack. If your backpack is designed to hold a maximum of 20 pounds but you try to carry 30 pounds, the straps may break or the material may tear. Just like overloading the backpack is risky, overloading a machine is dangerous and can lead to expensive repairs or accidents.

Since the density of material can vary from case to case, it is always advisable to check whether the load weight is within the safe gravimetric capacity. Check the load weight against the gravimetric capacity of the truck, how to check that? For that you need to know what is the unit weight of your material. If you know the density of your material, you can multiply it by the volumetric load to get the actual weight of the material in the truck.

To ensure that a vehicle is not overloaded, you need to know the density of the material being transported. Density is defined as the mass per unit volume, and by multiplying it by the volume (how much space the material occupies), you can find the total weight. This weight must be compared against the machine's gravimetric capacity to ensure safety.

Imagine you're filling up a glass of water. If you know that one cup of water weighs about 8 ounces, and you want to know how much five cups weigh, you can calculate that by multiplying 8 ounces by 5, giving you 40 ounces. Similarly, by knowing the density of your material, you can determine if the truck is filled safely.

Many times you can see that people will put these side boards on the trucks commonly to increase the volume. If the material is less dense, there may not be much problem, but if the material is denser like wet sand, it may overload the machine. This overload can cause wear on the machine and increase costs, particularly for tires, which make up about 35% of the truck's operating cost.

When trucks are overloaded, not only can this cause potential damage to the vehicle, but it also leads to increased operational costs. For example, the tires may wear out more quickly due to the added weight, leading to frequent replacements and higher overall maintenance expenses. Such practices, while seemingly beneficial for short-term productivity, are detrimental in the long run.

Think of your car: if you consistently carry too many passengers and heavy luggage, the tires may inflate irregularly and wear out much faster, leading to frequent tire replacements. Just like a car, trucks also suffer from overloading, which can lead to financial losses.

Balancing the capacity of the hauling equipment and the excavator bucket size will result in maximum loading efficiency and reduce total cost. Studies suggest that the truck capacity should be 4 to 5 times the bucket capacity. This 'thumb rule' helps ensure that both machines work at maximum productivity.

Having the right ratio between truck capacity and excavator bucket capacity is essential for operational efficiency. If a truck can carry 4 to 5 times what a bucket can load, it allows for smoother operations without waiting times. This balance leads to continuous workflow and maximizes the use of resources, ultimately leading to cost savings.

Consider a relay race: if the baton can move swiftly to runners waiting at a 400-meter mark for quick handoffs, the race will go smoothly. However, if the baton is slow or too small, the entire team can fall behind. Similarly, balancing equipment allows for a seamless workflow in construction operations.

To find the balanced number of trucks required for an excavator, divide the truck cycle time by the excavator cycle time. This balance number indicates the optimal operating level where both machines can work effectively without causing delays.

Calculating the balanced number of trucks ensures that neither the truck nor the excavator is underutilized. By dividing the truck's cycle time by the excavator's cycle time, you can determine how many trucks are needed to keep up with the loading pace of the excavator. If you have too few trucks, the excavator will often wait, leading to lost productivity.

Think of a restaurant with servers and cooks. If you have too many servers and not enough cooks, the servers will be left standing around waiting for food to be prepared. Similarly, having too few trucks means they are waiting for the excavator to load, decreasing efficiency.

If the calculated number of trucks isn't a whole number, decide whether to round it up or down based on the potential production cost associated with each option. It's usually more efficient to round down to avoid excess idle time for the loader.

When faced with a fractional truck number, you must evaluate the costs of operating with more trucks versus fewer. If the economics suggest that fewer trucks lead to better efficiency without causing idle time and delays for the loader, rounding down is often the best choice.

Imagine a bookstore that stocks books: too few copies leads to missed sales, while excessive stock can mean unsold inventory requiring discounts. Balancing your stock like trucks and excavators allows you to meet customer demand without overextending resources.

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