Gauges

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What is a Gauge?

A gauge is an important measuring device in the field of design engineering. It is a device used to provide certain dimensional information, according to a specified standard or system.

Some gauges are meant to measure the size of the object. But, most gauges are mainly used to specify if the dimensions of the measuring object are less or greater than defined standards that are within the tolerance range. Gauges can be operated electrically or mechanically.

They are generally considered as fixed-type or deviation-type instruments. Fixed-type gauges are designed to showcase if a given dimension is larger or smaller than the standard. They are usually made of soft steel, hard steel, or glass. To prevent rub-down, fixed-type gauges are chrome-plated or tungsten-carbide coated. Now let us know more about the various types of gauges.

Types of Gauges

Gauges are used to measure different types of objects having various sizes, shapes, and thicknesses, the gap in space, diameter of materials, or pressure of the flow. Specific types of gauges are used to measure each parameter. Gauges are classified into eight types, they are:

Plug gauge
Ring gauge
Taper gauge
Snap gauge
Feeler gauge
Thread gauge
Form gauge

We will review a few of the gauges below.

Feeler Gauge

This type of gauge is used for clearance between the mating surfaces. They are manufactured in the form of a bunch of blades using steel. They are made of 0.3 mm to 1 mm thickness and 10 mm long. To measure the size of clearance, one or two blades are inserted in between the contacting surfaces, until an exact blade is found.

Form Gauge

These are the types of gauges that are designed to check the profile of objects. Packs of blades featuring convex and concave circular profiles are known as radius gauges. They are used to measure the corners as well as radii of grooves.

Pin Gauges

A pin gauge is a tool used to measure the dimensions and positions of holes and slots. It's a cylindrical rod with a tapered tip that's inserted into the hole and rotated to ensure it touches the inner surfaces. The diameter of the gauge is then measured with a micrometer to get an accurate measurement.

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