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30+ Measuring Instruments for Mechanical Engineer

Here are 30 Measuring instruments for mechanical engineer. Every Mechanical Engineering student or employee should know about this.

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01. Vernier Caliper

Vernier Caliper is a widely used linear measurement instrument with a least count of 0.02 mm. It is used to measure linear dimensions like length, diameter, depth.

It is Basic Instrument of measurement, consist of two types of scale

The main scale and the Vernier scale that can slide along the main scale. Two types of measurement we can do, the first one is through external jaw (measure external dimensions) and another one is internal jaw (measure internal dimensions).

02. Outside Micrometer

External Micrometer is also known as Outside Micrometer or External Micrometer.

It is used to check outside diameter of circle by the means of accuracy of 0.01 mm or up to 0.001 mm.

Vernier type Micrometer gives highest acceptable accuracy of 1 micron such gauge is vernier type micrometer.

03. Vernier Height Gauge

Vernier height gauge used to measure vertical dimension from reference ground. Vernier Height Gauge consist of a graduated scale or bar is held in a vertical position by a finely ground fixed base.

The graduated scale has least count of 0.02 mm like Vernier Caliper has. And the way of taking a reading of measurement in Vernier Height Gauge is same as in Vernier gauge.

04. Steel Scale

Steel scale is single piece linear measuring instrument.

Steel scale indicates two units that are cm and inches, cm division on one side and inches, on another side.

05. Vernier Depth Gauge

Vernier Depth Gauge as the name suggests is used to measure the depth from the surface of reference of an object.

Vernier caliper also has depth bar but this can not be used as the standard measurement.

06. Vernier Bevel Protractor

A simple protractor is a basic device used for measuring angles with a least count of 1° or ½°. Bevel Protractor is an angular measuring instrument capable of measuring angles with a least count of  5’.

The protractor dial is graduated in degrees with every tenth degree numbered. The sliding blade is fitted into this dial I.e. it may be extended to either direction and set at an angle to the base.

07. Plunger Dial Gauge

The dial indicator or the Plunger dial gauge is one of the simplest and the most widely used mechanical comparator.

First of all the use of plunger dial gauge used to compare work-pieces against a master

08. Lever Dial Gauge

Lever Dial Gauge also knew as Test Indicator. It used to measure sensitive contact.

Lever Dial gauge usually measure up to 0.80 mm. But some special type lever dial design for measurement up to 2 mm.

09. Engineering Square

A ruler can be used to draw straight lines but there is no quarranty that the line drawn is accurate and exactly straight,this is where the engineering square is brought into use.

An engineering square also known as machinist square is similar in size and construction to a try square.

It is a tool used for making straight lines and are used to measure angles.

10. V Block

In Industries where precise marking and firm holding of objects is required, V-Blocks play a major role and are extremely important metalworking jigs.

The construction had two clamps:screw clamp and a U shaped handle like clamp and a V-block .

Gauges are derived from the French word”jauge” which means the result of the measurement. We are all aware that gauges are used to measure the thickness, size or capacity of something.

Likewise, radius gauges are instruments that are used to measure the radius of the object.

The radius gauge is combined with another gauge known as fillet gauge which in mechanics means a rounding of the part design

12. Digital Vernier Caliper

Digital Vernier Caliper is upgrading version of Analog Vernier Caliper, which is a widely used linear measurement instrument with a least count of 0.01 mm, more accurate than Analog.

This Digital type of vernier is similar to Analog Vernier Caliper Instead Dimension output in Digital Manner that is more convinces than analog type.

It also consists of two types of scale –

The main scale and the Digital display that can slide along the main scale. Two types of measurement we can do, the first one is through external jaw (that measure external dimensions like shaft) and another one is internal jaw (measure internal dimensions like hole).

13. Digital Micrometer

Digital Micrometer is a very popular instrument these days because of its easy of compactness of taking an observation.

Digital Micrometer can observe measurement in mm or inch depend upon our need basis.

14. Inside Micrometer

nside Micrometer is used to measure the larger internal dimension. Inside Micrometer can measure internal Diameter of holes and registers.

Types of Micrometer

There are various types of micrometers available in the industry each used for a specific purpose. One such micrometer is the “Inside Micrometer”.

The inside micrometer is used to measure the inner diameter of objects that are bonded by walls,cylindrical bore or hollow pipe.There are two types of Inside Micrometer

1. Analog type Inside Micrometer
2. Digital type Inside Micrometer

15. Depth Micrometer

We also measure depth through Vernier caliper, but Vernier caliper does not deliver as much as accuracy and precision, because extension rod of Vernier caliper has no standard, it used only for comparison purpose.

Depth micrometer used to measure the depth of an object with precision and accuracy with least count of 0.01 mm. The measuring span is 25 mm just like in micrometer, that can change by changing upsetting rod.

16. Measuring Tape

Measuring tape is used to measuring long distance.

17. Digital Height Gauge

The electronic Height gauge is very compact, simple, easy to use instrument widely used in industries, tool rooms, workshops etc.

Some think you should consider while handling Electronic Height Gauge, Because of the cost of Electronic Height gauge matter in any industries or organization.

18. Electronic Height Gauge

Electronic height gauge is advance form of height gauge. It has higher accuracy and multi function.

An Electronic height gauge can measure diameter,angle, parallelism, squareness along with length.

19. Digital Universal Caliper

Digital universal caliper is widely used for measure inner and outer length of work-piece

20. Sine Bar

Sine bar is a precision angle measuring instrument along with slip gauges. The name suggests that Sine bar work on sine principle. Slip gauge used to build up the height of sine bar.

The required angle is obtained when the difference in height between the two rollers is equal to the Sine of the angle multiplied by the distance between the centers of the rollers.

21. Digital Protractor

Digital Protractor measure an angle over 360 degree with a high accuracy of 0.1 degree. Digital Protractor is very simple and ease to measure angle by just putting between levels or surface.

22. Spirit level

To check level of any surface or table, spirit level is used for leveling.

23. Slip Gauge Set

Slip Gauge is set standard size rectangular shape block. Slip gauges are available in standard sets in both metric and inch units.

In metric units, sets of 31, 48, 56, and 103 pieces are available.

For example, the set of 103 pieces consists of the following:

1. One piece of 1.005 mm
2. 49 pieces ranging from 1.01 to 1.49 mm in steps of 0.01 mm
3. 49 pieces ranging from 0.5 to 24.5 mm in steps of 0.5 mm
4. Four pieces ranging from 25 to 100 mm in steps of 25 mm

24. Bore Dial Gauge

Bore Dial Gauge use to measure the inner diameter of the hole, it is gauge fitted with a plunger dial gauge. In this video, you are able to know how to measure diameter with a bore dial gauge.

Bore dial gauge used within the standard range that means bore dial gauge have a standard set of pins(anvils) with the variable range of up to 2 mm.

25. Feeler Gauge

A Feeler gauge is used to measure the clearance between two parallel flat faces for example piston and cylinder. As the name suggests, feeler gauge called as to measure neither tide nor freely.

Feeler gauges are used for measurement of clearances.

It is a tool that measures air or narrow gap widths between two surfaces in engines and machinery.

Feeler gauge available in no. of the blade like 10,13,20 and 28. With a step of 0.05 and 0.10 mm.

26. Thermocouple

Thermocouple consist of two dissimilar conductor wire, made from different metals. These wire are welded together at one end, form a junction used to measure temperature.

27. Thermister

Thermistors have a high coefficient of resistivity. Thermistors are made of semiconductor of solid type.

The suitable temperature measuring range for thermistor is -100 degree Celsius to 300 degree Celsius. Some special type thermistor can measure up to 600 degree of temperature.

The change in temperature is measured by changes in its resistance. So, the Wheatstone bridge circuit is used for it.

Also, thermistor can convert changes in temperature to corresponding changes in voltage as a current.

28. Barometer

Air gets pulled down by gravity and hence air exerts pressure on objects. One such example of measurement is known as a barometer.

Barometers are scientific instruments that are used for the measurement of atmospheric or air pressure. It is an important and essential tool used in the meteorological department for forecasting short term weather and altitude changes.

The barometers should be kept at the same level and cannot measure air pressure above the altitude of 5,000 feet. Initially, water-based barometers were used, later it was replaced by mercury and aneroid barometers which the two most commonly used barometers.

29. Snap gauge

Snap gauge is GO and NOGO type gauge. That means snap gauge consist 2 fixed measured distance or gap, one is known as GO and another one is known as NOGO.

30. Plain Plug gauge

Plug gauge is used for assessment of hole or diameter of an object. With specified tolerance of GO and NOGO side, plug gauge is also known as pin gauge.

Behalf of checking the diameter plug gauge also use in comparing, setting, calibrating of other gauges.

31.Galvanometer

In an electric circuit, even if the switch or loop is closed, it is difficult to know whether the current is flowing, hence for this purpose galvanometer was introduced in the circuit.

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Vernier Caliper and Micrometer for Mechanical Engineers

Vernier caliper and Micrometer both are widely used in industries for daily quality control. Both are simple to use and easy for measurement.

Vernier Caliper and Micrometer both are available in Digital form. that means more accuracy and precise measurement we can process.

Before we go for differences, Let’s see the basic introduction of Vernier caliper and Micrometer.

Vernier Caliper

Vernier Caliper is a widely used linear measurement instrument. It is used to measure linear dimensions like length, diameter, depth.

There are three types of Vernier Caliper

1. Analog Vernier Caliper
2. Dial Vernier Caliper
3. Digital Vernier Caliper

Analog Vernier Caliper

It is the most common Instrument of measurement, It consist of two types of scale

The main scale and the Vernier scale that can slide along the main scale.

Two types of measurement we can do, the first one is through the external jaw (measure external dimensions) and another one is internal jaw (measure internal dimensions)

The most common Least count of Analog Vernier Caliper is 0.02 mm. You may also find vernier least count of 0.05 mm or 0.1 mm

Dial Vernier Caliper

Vernier scale is replaced by Dial indicator in dial vernier caliper. Dial indicator helpful for easy measurement understanding.

Least count of Dial Vernier caliper is the same as Analog type.

Digital Vernier Caliper

Digital Vernier Caliper is upgrading version of Analog Vernier Caliper, which is a widely used linear measurement instrument with a least count of 0.01 mm, more accurate than Analog.

Micrometer

The micrometer is more precise and accurate than Vernier caliper. Usually, two types of Micrometer are

1. External Micrometer
2. Digital Micrometer

External Micrometer

External Micrometer is also known as Outside Micrometer or External Micrometer.

It is used to check outside diameter of the shaft by the means of the accuracy of 0.01 mm or up to 0.001 mm.

Digital Micrometer

Digital Micrometer is a very popular instrument these days because of its easy of compactness of taking an observation. Digital Micrometer can observe measurement in mm or inch depend upon our need basis.

The accuracy of Digital Micrometer 0.001 mm which is highly accurate and precise than External Micrometer. You can choose Digital Micrometer with an accuracy up to 0.001 mm if the cost does not matter

Main Differences between Vernier Caliper and Micrometer

1. Usually Micrometer is more accurate and precise than Vernier caliper

2. Measurement range of micrometer is 25 mm while vernier caliper has wide range.

3. You can check depth by vernier caliper but in case of micrometer you have to use Depth Micrometer

4. Inside Micrometer is used for measurement of inner diameter but in case of vernier caliper it is checked by internal jaw.

Or Watch this Video

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Laser Interferometer

Interferometers are used in many fields of science and engineering. They are called interferometers because they work by merging two or more sources of light to create an interference pattern, which can be measured and analyzed.

Video Explanation of laser Interferometer

Laser Interferometers measure distance with extreme accuracy. It is possible to measure 1nm by laser Interferometer.

This resolution and accuracy make Laser Interferometers effectively the best way to measure distances accurately in most engineering applications.

Interferometers can also be used to measure other things apart from the distance like

• Straightness Measurement
• Combined straightness and displacement measurement
• Straightness measurement via Autocollimation.
• Flatness via autocollimation.
• Vibration.
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Top-5 Interview Questions for Quality Engineer

A quality engineer is responsible for making sure that manufacturing processes in industry are performed correctly using the right tools, materials with in acceptable tolerance .

Here We have a Top-5 question for you to reach your destination. Also, we have a better recommendation that helps you to become a Quality Engineer, Technical Manager or Quality Manager.

Our online course of ‘The Uncommon skill of Metrology‘ helps you to become a Quality Engineer, Technical Manager, or Quality Manager. Because it has all the essential information you need to know!

Q.1 What is Measurement?

Measurement is a Natural part of everyday life. We express daily needs in size & weights, water and electricity are also metered.

A number of blood samples, active sub-stain in medicine also needs to be precise.

I think it is Impossible to describe anything without measuring it.

Read More at Chapter-1 | What is Metrology & Measurement?

Q.2 What is Tolerance in Measurement?

The tolerances on the dimensions can be specified in three ways:

Unilateral Tolerance System

In this system, the tolerance is provided on only one direction from the basic size

For example 35.00 plus 0.2,plus 0.5

Bilateral Tolerance system

In this system, the tolerance is split into two parts and shown on both sides of the nominal size.

For example 35.00 plus 0.2,Minus 0.5

Limit Dimension system

In this system, the size and deviation of the part are specified by only maximum and minimum dimensions. For example 35.2 to 35.5 mm

Read More Chapter-2| Limit,Fit and Tolrance

Q.3 What is Calibration?

Calibration is the set of operations that establish under specified conditions, the relationship between values of quantities indicated by a measuring instrument or values represented by a material measure and the corresponding values realized by standards.

Read More Terminologies Used in Engineering

Q.4 What is Suitable Environment Condition for Measurement?

Temperature should be 20 +/- 2 degree Celsius and Humidity should be 50 +/- 10 %

Q.5 What is least count of Vernier caliper and Micrometer?

Vernier Caliper is a widely used linear measurement instrument. It is used to measure linear dimensions like length, diameter, depth.

The most common Least count of Analog Vernier Caliper is 0.02 mm. You may also find vernier least count of 0.05 mm or 0.1 mm

There are three types of Vernier Caliper

Digital , Analog and Dial Vernier Caliper

Micrometer is used to check outside diameter of the shaft by the means of the accuracy of 0.01 mm or up to 0.001 mm.

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What are the different types of measurement?

According to way to measuring direction, we have

[1] Linear Measurement

Linear Measuring instruments are designed to measure the distance between two surfaces or points ( end measurements) like Vernier Caliper, Micrometer do. The Basic Fundamental unit of linear measurement is mm. It is one of the seven units.

[2] Angular Measurement

The concept of Angle come from the circle. Actually Angle is a part of circle. We measure an angle in Degree or radian. Usually, the primary objective of angle measurement is not to measure angles but the assessment of alignment of machine parts or products.

[3] Comparing measurement

A device that compares the unknown length with the standard. Such measurement is known as comparison measurement and the instrument, which provides such a comparison, is known as Comparator.

Comparators are generally used for linear measurements. And it gives only dimensional differences in relation to a basic dimension of the object.
Various comparators currently available basically differ in their methods of amplifying and recording the variations measured.
In comparison measurement, it is dependent on the least count of the standard and the means for comparing.A comparator should have a high degree of accuracy and precision.

Comparator can be it mechanical, Pneumatic, or electrical,by the means of amplification of signals, linearity of the scale within the measuring range should be assured.

[4] Temperature measurement

Temperature is one of the seven fundamental unit of measurement, unit of temperature is Kelvin(K).

We use two types of scale in measuring temperature that is –

1.Relative scales [Fahrenheit (°F) and Celsius (°C)]

2. Absolute scales [Rankine (°R) and Kelvin (K)].

Footnotes

What is the least count of micrometer?

Eternal Micrometer used to check outside diameter of circle by the means of accuracy of 0.01 mm or up to 0.001 mm. Vernier type Micrometer gives highest acceptable accuracy of 1 micron such gauge is vernier type micrometer. Visit External Micrometer- Introduction/Measurement/Specification

What is the SI unit of distance and displacement?

The SI unit of Distance is “Meter”. Distance also measure in mm, cm, km, yard,inch, foot,feet etc. The relation between Units of Distance is listed below

Relation between Units of Distance

What is pressure and its SI unit?

Pressure is the force extorted by a medium like liquids, gases and solids. Pressure is measure by force per unit area. So we have a mathematical formula of pressure that is

Pressure = Force/Area

Let say, force is in N (Newton) and Area is in mm (millimeters) than, SI unit of pressure is N/mm².

Pressure is the measurement quantity that describe a system. Usually, the pressure differences is used as a means of measuring the flow rate of the fluids. Pressure is invariably significant process parameter.

What is the least count of height gauge?

For vernier Height Gauge, least count is 0.02 mm, and for digital height gauge least count is 0.001 mm. More about height gauge Vernier Height gauge and Electronic Height Gauge

What instruments can be used to measure length?

Linear Measuring instruments are designed to measure the distance between two surfaces or points (end measurements) like Vernier Caliper, Micrometer does.

The linear Measuring instrument is simple, accurate, economical and easy to operate. The original accuracy of the linear instrument depends upon line graduation mounted on instruments… Continue reading

There is the number of instrument available, some basically and widely used are

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