Fasteners and Set Screws Quiz
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Questions and Answers

What is the primary factor that affects the holding power of set screws?

  • The threading pattern on the set screw
  • The type of manufacturing process used
  • The friction caused by the contact surface (correct)
  • The material composition of the screw

In which part of the hub are set screws typically found?

  • Near the outer perimeter of the hub (correct)
  • Along the horizontal shaft axis
  • Securely embedded in the hub wall
  • Within the spindle socket

What method is commonly used to ensure that set screws remain locked in place?

  • Applying a thread-locking adhesive (correct)
  • Using a cotter pin mechanism
  • Utilizing a locking washer
  • Incorporating a safety nut

Under what circumstances should set screws be replaced?

<p>When they are stripped or damaged (D)</p> Signup and view all the answers

What is the correct method to remove parallel keys?

<p>Using a special removal tool to pry them out (D)</p> Signup and view all the answers

Which type of key is specifically designed for use with a hub that has a tapered shape?

<p>Tapered key (D)</p> Signup and view all the answers

What is the primary method for measuring the depth of a keyseat?

<p>Using calipers (D)</p> Signup and view all the answers

Which term refers to the criteria that determines the dimensions and fitting of keys and their corresponding keyseats?

<p>Class of fit (D)</p> Signup and view all the answers

What shape do Woodruff keys typically have?

<p>Semi-circular (C)</p> Signup and view all the answers

Which type of key is typically used in applications where a key may need to be frequently removed and replaced?

<p>Feather key (D)</p> Signup and view all the answers

What size key is generally recommended for a shaft measuring 1 inch in diameter, according to common practices?

<p>3/8 inch wide key (D)</p> Signup and view all the answers

What is typically the purpose of using set screws in conjunction with keys?

<p>To secure the key in place against axial movement (A)</p> Signup and view all the answers

Which of the following is NOT a common type of key used in machinery?

<p>Bushing key (C)</p> Signup and view all the answers

Flashcards

Set screw holding power

The force a set screw can exert to keep parts in place.

Set screw location in hub

Set screws are found on the hub, often pressed against a shaft's surface for secure fit.

Set screw locking method

Set screws are locked in place through tightening.

Set screw replacement

Set screws should be replaced if they show signs of wear or looseness.

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Gib-headed key removal

Gib-headed keys are removed by first loosening the gibs, then extracting.

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Key Purposes

Keys secure shaft to hub for rotational transmission or prevent slippage

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Key Selection Criteria

Key selection depends on shaft size, material, application, and force required

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Keyseat Definition

Keyseat is a groove in a hub or a shaft to hold a key

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Parallel Keyseat

Open or boxed groove, aligned with shaft to accommodate parallel keys

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Woodruff Key

A key with a special shape, creating a keyseat with a specific, interlocking design

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Key Installation

Keys are installed by aligning them with grooves and then securing them with set screws or other methods

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Class of Fit

Describes the degree of tightness between a shaft and a hub. Tolerances specify acceptable variations in size

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Key Types

Different types of keys include parallel, square, offset, saddle, boxed, sunk, feather, gib-headed, tapered, and Woodruff.

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