Question

4. Write the law of double purchase crab machine.​

Answer 1

Explanation:

The reason behind this is that the diameter of the two gears becomes smaller than the diameter of one gear with the same ratio as the combined ratio of the two gears. This makes the whole package more compact and easier to handle, despite a high gear ratio and thus high lift capacity

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Answer 2

Its works under the principle of velocity ratio.

Explanation:

The velocity ratio is also defined as the ratio of the distance at which any part of the machine moves to the distance at which the driving part moves at the same time. An object has a mechanical advantage if it exerts a force that is higher than the velocity ratio.

• In the case of a double purchase crab winch, the velocity ratio is achieved in two stages. There are two spur wheels of teeth and two pinions of teeth in this lifting machine.
• The arrangement of the spur wheels and pinions is such that the pinion with the teeth T1 has the spur wheel of the teeth T2.
• In the same way, the T3 teeth pinion with the T4 teeth spur wheel. The effort is being applied to the handle.

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