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The hand-operated lifting unit shown opposite uses a leadscrew mechanism to raise and lower ride-on lawnmowers for servicing - Leaving Cert Engineering - Question a - 2021
Question a
The hand-operated lifting unit shown opposite uses a leadscrew mechanism to raise and lower ride-on lawnmowers for servicing. (i) Describe, with the aid of a diagra... show full transcript
Worked Solution & Example Answer:The hand-operated lifting unit shown opposite uses a leadscrew mechanism to raise and lower ride-on lawnmowers for servicing - Leaving Cert Engineering - Question a - 2021
Step 1
Describe, with the aid of a diagram(s), the operation of the leadscrew mechanism in lifting the ride-on lawnmower.
Answer
The operation of the leadscrew mechanism involves a handle attached to a screw. When the handle is rotated, the screw thread turns, which in turn rotates the leadscrew. The platform that supports the lawnmower is attached to a fixed threaded nut, allowing it to move up and down as the lead screw turns. This system provides a mechanical advantage, making it easier to lift the weight of the lawnmower.
As the handle continues to rotate, the platform ascends until it reaches the desired height for servicing the lawnmower. Once the lawnmower is safely elevated, the handle can be secured to maintain its position.
Step 2
Describe, with the aid of a diagram(s), one other method of lifting a ride-on lawnmower safely.
Answer
Another effective method for lifting a ride-on lawnmower is the use of a scissor lift mechanism. This system incorporates hydraulic cylinders that can push the scissor arms upwards, raising the platform where the lawnmower is placed.
The hydraulic cylinders operate by controlling the flow of fluid to the cylinders, allowing for precise lifting and lowering of the lawnmower. This method is not only efficient but also ensures that the lawnmower is held securely in place during servicing.