Pulley

1. Introduction 1.1 – What Is a Crane? The Oxford Dictionary defines a crane as “A large, tall machine used for moving heavy objects by suspending them from a projecting arm or beam” (Oxford Dictionaries, n.d.). Today they are a common sight on building sites around New Zealand. They come in many different forms that have been adapted to suit different applications. 1.2 – What are the main (common) parts of a crane? Cranes vary in size, shape & specialty but they are all based on the same principal. As such, there are some parts that are common between all cranes that have been listed below. These elements are also shown in Figure 1. Boom (jib)– This is the arm that does all the lifting. Hook Block – A pulley block with a hook. This is where…

On November 7, 2017, I had the pleasure of listening to Brett Pulley discuss aspects of his life and career through advertising and public relations. Today, Mr. Pulley is the Executive Vice President at Weber Shandwick, a public relations firm formed in 2001 and located in New York City. Throughout his career Pulley has worked for multiple firms such as Barbie, Harley Davidson, Fisher Price, and many more. He has traveled to multiple countries throughout his life time and won two first place…

Sculley as City Manager During her career as San Antonio City Manager Sheryl Sculley has wielded her power to effect change within every aspect of city government. From shaking up departments to focusing the city budget Sculley revamped and revived city government to make it more effective. Before even her first official day on the job, Sculley had been tasked by Mayor Phil Hardberger with handling the ongoing problems with the fire department equipment. She pursued the issue working to get new…

evel the force table and put one of the pulley at the angle 35° and another at 150° Place .100 slotted mass on a weight hanger at 35° Place .200 slotted mass on a weight hanger at 150° Place another pulley at different angle from 35° and 150° On the third angle, place the amount of slotted mass so the ring will remain in center of the force. Now the ring is at equilibrium. Record the required slotted mass that made the ring at equilibrium. Record the tensions in each of the strings on the…

immediately. Thankfully, it’s easy to replace a serpentine belt when you notice wear to prevent this from happening. Checking Your Serpentine Belt The vehicle’s serpentine belt will be located on the engine, typically on the passenger’s side. The belt will be approximately 1 inch thick, wrapping around several pulleys that are used to provide power to your vehicle’s power steering, air conditioner, and water pump. Look at it closely to see if you can find any fraying or…

31 RPM) x (1 rev)/(2π rad) x 60 s = 913.16 Nm TA = 913.16 x (784.31 RPM)/(261.44 RPM) = 2739.45 Nm TMotor = 2739.45 x (261.44 RPM)/(1785 RPM) = 401.23 Nm 1.4. Pulley and Belt Specification According to the JEDR report, the pulleys’ size ratio is reversed, instead of 3:1 for pulley A to pulley B ratio, it assumed them as 1:3 for drive pulley is smaller than driven pulley. This mistake will lead to a necessary correction for contact angles. Furthermore, the incorrect RPMs will lead to the…

1. What simple machines did you incorporate into your nifty lifting machine? In the nifty lifting machine Kenny, Kaylee and Josh used three simple machines. The group used a pulley system as the first simple machine. The pulleys are what allowed lifting the 600 gram can up the five centimeters. The group also used a wheel and axle, which is the crank that was used to pull up the cans. The wheel is the handle that turns axle, which is the dowel rod the group used to tie the rope around. Then,…

If your vehicle starts squealing when you are driving, there is a good chance that the drive belt needs to be replaced. This sound may start out gradually and increase in loudness and how frequently you hear it over time. Here are four terms that will help you understand what your mechanic is talking about when you take your vehicle in to get your drive belt inspected and replaced. Drive Belt The drive belt on your vehicle is located at the front of your engine. It is connected to your engine…

Research question: How does the mass (grams[±0.1g]) on one side of a pulley affect the mass (grams), and create equilibrium? Hypothesis: If the differences in masses (grams{±0.1g}) on each side of the pulley increases, then the mass in the middle of the two pulleys will be required to increase, because they will have to balance out each other’s mass to establish equilibrium. If the mass (grams{±0.1g}) on a side of a pulley decreases, then the mass in the middle of the two pulleys will be…

The main reason for this power loss is likely due to the slipping of the belt with respect to the driven pulley. This is because the two surfaces of the wire and pulley are not physically attached, but rather the transmission of force relies on the friction between the two surfaces. Therefore, under this scenario it can be considered that the wire was not effectively in contact with the pulley the whole time (it ‘slipped’) and so some power was wasted. This problem is largely reduced by using a…