Scissor Jack
Cecil hills high school
Engineering Studies
Lifting Devices
MARTIN.MAROKI
Abstract
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
Nomenclature
N Newton’s
kN Kilo Newton’s
MPa Mega Pascal’s
MA Mechanical Advantage
F Force
L Load
E Effort
A Area
Lifting Devices
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.
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Engineering Studies
Lifting Devices
MARTIN.MAROKI
Abstract
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
Nomenclature
N Newton’s
kN Kilo Newton’s
MPa Mega Pascal’s
MA Mechanical Advantage
F Force
L Load
E Effort
A Area
Lifting Devices
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