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Which of the following threads is used for transmission of power? I. Square thread II. Buttress thread III. Acme thread Choose the correct answer from the options given below

Which of the following threads is used for transmission of power? I. Square thread II. Buttress thread III. Acme thread Choose the correct answer from the options given below Correct Answer I, II and III

Concept:

Square and trapezoidal threads are 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. E.g. Fly presses, Screw jack, vice handles, cross-slide and compound slide etc.

Trapezoidal threads: These threads have a profile which is neither square nor V thread form and have a form of 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 other flank is at 45°. These threads are used in power press, 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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The threads given in question i.e. Square, Acme and Buttress all can be used in power transmission.

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