Types of Gauges in measurement  Explained with Example

Types of Gauges in Measurement

→ Gauges are the inspection tools with or without scale which are used to check manufacturing parts. They do not indicate the actual value of the inspected dimension on the parts.
→ They can only be used to determine whether the inspected part has been made within the specified limit or out of the specified limit.
→ A clear distinction between measuring instruments and part or object is not always observed, at that time Gauges are used largely for measuring work.
→ They are an important part of Measurement System Analysis Study and mainly they are divided into two categories. (01) Standard (02) Non-Standard

[1] Standard:

→ If it is an exact copy of the mating part of the component to be checked, it is called Standard Gauge
→ Widely used for checking the limit of the dimensions of the part, i.e lower limit and higher limit they are known as "Go" and "No-Go"
→ Examples: Ring, Plug, Thread gauge, etc....

[2] Non-Standard:

→ If it has no accurate standard measurement but it is made from some relative reference is called non-standard gauge.
→ Examples: Checking fixtures, Temples, etc....



Why Gauges are needed?

→ They are needed due to the following reasons:
→ Inter-changeability of parts.
→ Smooth Assembly.
→ Easiness in manufacturing


How to use Gauges?

→ Do not use it as a hammer, this will cause deformation.
→ Avoid any hard/sharp object to come in contact with the gauges, this will cause a dent/scratches on the surface.
→ Do not force it inside the hole to be measured, this will cause fast wear and damage, Let the gauges enter the hole with its own weight.
→ After usage, grease/oil should be applied and kept at a proper place.

Examples of Gauge



Examples of Gauges:

[01] Feeler:
→ They are a bunch of fine thickened steel strips with a marked thickness which are used to measure gap width or clearance between the mating surface.

[02] Bore:
→ A bore gauge is used to calculate the hole size. It is analog or digital.

[03] Depth:
→ A depth gauge is used to measure the depth of a slot, hole or any other surface of an object. It can be of a scale, dial or digital type.

[04] Angle plate:
→ It is a right angle plate or tool used to measure the true right angle of two objects joined together.


[05] Dial or Dial Indicator:
→ The dial indicator is utilized in different tools as stated above and can be separately used to calculate the trueness of the circular object, bending of an object, etc.

[06] Thread pitch
→ A thread pitch gauge, also known as a screw pitch or pitch, is used to measure the pitch or lead of a screw thread.

[07] Gauge Block
→ It is also known as a slip gauge or Jo block and it is very precise.
→ It was Invented in 1896 by Swedish machinist Carl Edvard Johansson, they are used as a reference for the calibration of measuring equipment used in machine shops, such as micrometers, vernier, sine bars, calipers, and dial indicators(when used in an inspection role).

 [08] Ring
→ A ring gauge is a cylindrical ring of steel whose inside diameter is finished as per tolerance and is used for checking the external diameter of a cylindrical object.
→ They are used for comparative gauging as well as for checking, calibrating, etc.


[09] Ruler and scales:
→ Ruler and scales are used to measure lengths and other geometrical parameters.
→ They can be a single steel plate or a flexible tape type.

[10] Vernier caliper:
→ Vernier caliper is a precision instrument used to measure a small distance with high accuracy.
→ It has got two different jaws to measure the outside and inside dimensions of an object.
→ It can be an analog or digital type of instrument. It is more accurate than the ruler or scale.

[11] Micrometer:
→ It is a fine precision tool that is used to measure small distances and is more accurate than the vernier caliper.

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