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To ensure self-locking in a screw jack it is essential that helix angle is
- a)larger than friction angle
- b)smaller than friction angle
- c)equal to friction angle
- d)such as to give maximum efficiency in lifting
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
To ensure self-locking in a screw jack it is essential that helix angl...
For.self locking
φ ≤ α (Friction angle > Helix angle)
(μ = tan φ)
φ ≤ α (Friction angle > Helix angle)
(μ = tan φ)
Most Upvoted Answer
To ensure self-locking in a screw jack it is essential that helix angl...
Explanation:
Friction Angle:
- The friction angle is the angle at which two surfaces meet and resist relative motion.
- In the case of a screw jack, the friction angle represents the resistance to motion between the threads of the screw and the load being lifted.
Helix Angle:
- The helix angle of a screw jack is the angle between the thread helix and the axis of the screw.
- It determines the efficiency and self-locking ability of the screw jack.
Relationship between Helix Angle and Friction Angle:
- In order to ensure self-locking in a screw jack, the helix angle must be smaller than the friction angle.
- A smaller helix angle creates a steeper thread profile, which increases the resistance to motion and prevents the screw jack from self-lowering under load.
- If the helix angle is larger than the friction angle, the screw jack may not be able to hold the load in place and could start to unwind.
Conclusion:
- Therefore, to ensure self-locking in a screw jack, the helix angle must be smaller than the friction angle to provide sufficient resistance and prevent the screw jack from self-lowering.
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To ensure self-locking in a screw jack it is essential that helix angle isa)larger than friction angleb)smaller than friction anglec)equal to friction angled)such as to give maximum efficiency in liftingCorrect answer is option 'B'. Can you explain this answer?
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