Question
Download Solution PDFWhich type of thread is used in screw jack?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Square and trapezoidal threads are the most commonly used threads.
Square thread:
- In this thread, the flanks are perpendicular to the axis of the thread.
- This is used for transmitting motion or power.
- Examples Fly presses, Screw jacks, vice handles, cross-slide and compound slides, etc.
Trapezoidal threads:
- These threads have a profile which is neither square nor V thread form and have a form of a trapezoid.
- Different forms of trapezoidal threads are ACME thread, Buttress thread, Saw-tooth thread, Worm thread
- ACME thread: It has an included angle of 29°. These are used in lathe lead screws.
- Buttress Thread: In this thread, one flank is perpendicular to the axis of the thread and another flank is at 45°. These threads are used in power presses, carpentry vices, gun breeches, ratchets, etc.
- Knuckle thread: The shape of the knuckle thread is not trapezoid, but it has a rounded shape. It has limited applications. It is used for valve spindles, railway carriage coupling, hose connections, etc.
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