Part A Examination of current lifting devices (40 marks)
You are to prepare a report comparing two lifting devices used to raise motor vehicles. Compare and contrast the two devices, explain their advantages and disadvantages. Your report will include;
• a photograph and sketch of each lifting device and the lifting capacity, • a comparison on the 2 different methods of application,
• a table examining each part of one device;- manufacturing method, material used • the calculated mechanical advantage and velocity ratio of one device • A scaled sectioned assembly drawing of the main screw bolt and nut of a car jack. You must also recommend one (1) of the two (2) for emergency roadside use with a large family car, such as a Commodore or Falcon (of course). Explain why you are recommending this lifting device over the other one.
Table of Contents
List of Figures
kN Kilo Newton’s
MPa Mega Pascal’s
MA Mechanical Advantage
A mechanical jack is a device which lifts heavy equipment. The most common form is a car jack, floor jack or garage jack which lifts vehicles so that maintenance can be performed. Car jacks usually use mechanical advantage to allow a human to lift a vehicle by manual force alone. More powerful jacks use hydraulic power to provide more lift over greater distances. Mechanical jacks are usually rated for a maximum lifting capacity for example, 1.5 tons or 3 tons. The scissor jack is made for a modern vehicle and the notch fits into a hard point on a unibody. Earlier versions have a platform to lift on the vehicles' frame or axle. There are available...