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Himanshu Kulshreshtha
Elite Author
Asked: 2024-04-20T22:02:52+05:30 In:

Describe ‘plug’’and ‘snap’gauges with neat sketches.

Describe ‘plug’’and ‘snap’gauges with neat sketches.

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    1. Elite Author

      Plug Gauges:

      A plug gauge, also known as a pin gauge or go/no-go gauge, is a cylindrical gauge used to check the diameter of a hole or bore. It consists of a cylindrical shaft with precise dimensions corresponding to the tolerance limits of the hole being checked. Plug gauges are commonly used in manufacturing and quality control to ensure the accuracy and uniformity of hole diameters.

      • Go Plug Gauge: The go plug gauge is designed to check the lower limit (minimum diameter) of the hole. It should fully enter a hole that is within the specified tolerance range, indicating that the hole is of acceptable size.

      • No-Go Plug Gauge: The no-go plug gauge is slightly larger than the go gauge and is used to check the upper limit (maximum diameter) of the hole. It should not fully enter a hole that is within the specified tolerance range, indicating that the hole is too large and out of tolerance.

      Here's a sketch illustrating plug gauges:

                    |                            |
              |   Go Plug Gauge (within     |   No-Go Plug Gauge (out
              |   tolerance range)          |   of tolerance range)
              |                            |
--------------------------------------------|-------------------------
              |                            |
          Hole within tolerance range       |   Hole out of tolerance
              |                            |

      Snap Gauges:

      A snap gauge, also known as a gap gauge or bore gauge, is used to measure the external diameter or thickness of a workpiece. It consists of a frame with two anvils (or jaws) that can be adjusted to measure different diameters. Snap gauges are versatile tools commonly used in production settings for quick and accurate measurements of cylindrical parts.

      • Adjustable Anvils: Snap gauges have movable anvils that can be adjusted to accommodate different diameter ranges. The anvils are set to match the nominal dimension of the workpiece being measured.

      • Measurement Procedure: To measure a part, the snap gauge is adjusted to the desired size by setting the anvils. The gauge is then closed around the part, and the gap or snap between the anvils indicates whether the part's diameter is within tolerance.

      Here's a sketch illustrating snap gauges:

         |<----------------------- Gap or Snap ----------------------->|
   |                                                             |
   |    Workpiece (cylindrical part)                              |
   |                        |                                    |
   |                        |                                    |
   |        Snap Gauge Frame (with adjustable anvils)             |
   |                        |                                    |
   |                        |                                    |
   |_____________________________________________________________|

   Workpiece diameter within tolerance range (snap gauge closes properly)

      In summary, plug gauges and snap gauges are essential tools used in manufacturing and quality assurance to ensure the dimensional accuracy of holes and external features of workpieces. Plug gauges check the diameter of holes using go/no-go principles, while snap gauges measure the diameter or thickness of cylindrical parts by closing around them with adjustable anvils. Understanding these gauges is crucial for maintaining precision and consistency in manufacturing processes.

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