Types of Gauges in Measurement

[1] Standard:

[2] Non-Standard:

Why Gauges are needed?

How to use Gauges?

Examples of Gauges:

→ 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 ofand mainly they are divided into two categories. (01) Standard (02) Non-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....→ 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....→ They are needed due to the following reasons:→ Inter-changeability of parts.→ Smooth Assembly.→ Easiness in manufacturing→ 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.[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.