This also includes the weight of an operator. The mass at the forklift s center of gravity (CG) was then taken 7,903 lb. Figures 1 through 8 show each configuration and include dimensions. Finally, find the true maximum load the forklift can handle for each of the six configurations. Assume that all boxes weigh 5,000 lbf (in pounds). First, determine the normal force for axle A and axle B if the forklift is in static equilibrium for all six configurations as well as when the forks do not bear any load. These two configurations as well as a configuration with no tilt will need to be analyzed for both types of boxes. and may need to tilt forward or backward by five degrees (Figures 1 through 8). The mast, which is the portion of the forklift that extends to lift the load 4, will need to be raised to its maximum height of 170 in. Assume that the forklift operator will lift the boxes from their width, meaning they will always be lifted from a side that is 42 in. (all dimensions are in inches) while others are longer at 84 in. Problem Statement Two types of boxes needed to be moved from a transport vehicle onto the top shelf of a warehouse rack. Using this information, a scenario was created and the forklift was analyzed in six different configurations as explained further below. According to the United States Coast Guard, the average weight of an American person is 185 pounds 1. Furthermore, the standard weight of an operator was taken into consideration.
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Hyster, the manufacturer of the popular H50 forklift, published a technical operating manual that was used to gather data about the dimensions and mass of the lift 5.
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An online presentation compiled by Bruce Mayer, a professional engineer and statics instructor, was used as the basis of our analysis 3. However, this report will focus only on one specific model, namely the Hyster H50 (See Figures 1 through 8 and the specific model in operation is shown in Figure 10). There are many different styles and models of forklifts on the market today. Often forklifts are used to 1Ģ move raw material from transport vehicles onto the factory floor, reposition objects inside the factory, or place finished products back onto transport vehicles to be shipped to customers.
Forklifts are used in most industries because they can quickly transport just about anything from bags of sand, breakfast cereal to heavier loads like machine parts and construction materials.
Introduction Forklifts are the machines of choice in most material handling applications. This work was completed as a semester project to fulfill partial course requirement for MAE 241 Statics. In addition, an increase in size to the boxes, but not the weight, caused a faster tipping point because the center of gravity of the box was farther away from the front two wheels. It was found that forks tilted backwards could lift more weight and provide better static stability. Backward, vertical, and forward mast angles were used for analysis. Second, a fixed load was added and the normal force on each pair of tires was found. First, the maximum weight that could be lifted in the air by the forks before the unit tipped was found. This resulted in two types of calculations. when there were no other static forces keeping them affixed to the surface. It was found that the tipping point of the forklift was reached when the back two tires of the macine started to leave the ground, i.e. Note that only the tipping force and the normal forces created by the forklift and the load it carried were analyzed using the basic governing equations of static equilibrium. Furthermore, the maximum load that could be lifted before tipping was determined for several configurations depending on the forks positioning. Static forces on the tires of forklift machine when the forklift was unloaded as well as when standard loads were being lifted, have been determined. Depending on work space availability (warehouse or in the street), larger and heavier forklifts are less likely to tip while lifting up or lowering down in materials handlings. There are various forklift models commercially available on the market however, this static tipping analysis was conducted on one specific model of forklift machine, namely the Hyster Model H50. They are often seen used for moving raw materials from transport vehicles onto the factory floor, repositioning objects inside the factory, or placing finished products back onto transport vehicles to be shipped to customers. 1 Static Analysis of a Forklift Yogendra Panta +, Aaron Paynter, Joseph Richmond, Sam Jarrell Department of Mechanical Engineering West Virginia University Institute of Technology (WVU Tech) Montgomery, West Virginia 25136, USA Corresponding Author: + Abstract Forklifts are versatile machines used in most material handling applications.
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