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V-Block: Base of quality control and assurance

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

V-blocks are marking and work-holding equipment used in drilling, grinding, finishing and milling operations.

The object is kept in the V-shaped middle part and a screw clamp is tightened so that the object stays firmly when the milling and other operations are done.

The name was originated because the middle part of the equipment had a ‘V’ shape where the objects were fixed.


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

The materials used are hardened tool steel and cast iron. The V-block is used as a locator and a centralizer.

It is mostly used to fit round or cylindrical objects tight and rigid for easy marking or cutting.


It can be classified into different grooves,levels,clamps (or) grades.

Based on grooves the V-blocks can be classified as single groove and double groove,based on grades-Grade A and Grade B.

Grade A is of 100 mm whereas Grade B is of 300 mm, based on levels it is single and double level.

For long cylindrical objects a matched pair is used here two clamps and two V-blocks having the same size are used to hold the object.

The clamps are connected to the V-Block by sliding in the end or middle.

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Simply Snap Gauge for measurement

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

GO means your job or workpiece is OK and NOGO means your workpiece is rejected.

In snap gauge, value of GO is always greater than NOGO.

Let set an example,

we have a snap gauge of size

12.500 +/_ 0.050 mm

So our

GO size = 12.550 mm

NOGO size = 12.450 mm

and it is measuring criteria for a work piece.

GO condition

go snap gauge
Work piece is OK

According to snap gauge, 25.55 mm size is acceptable for a workpiece. When we push snap gauge towards the workpiece the only area of GO cover i.e. workpiece is accurate.

NOGO condition

nogo snap gauge

If Snap gauge able to move till NOGO area that means workpiece is undersized.

Snap gauge is usually checked for outer surface, which can easily be observed favorable or not.

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free gauge education

A good instrumentation course should solemnly consist of extensive understanding of the instrument and it’s various aspects.Instrumentation edu for all is a website based page that gives education on scientific instruments,industrial gauges and quality measurement.

GaugeHow allows education training through YouTube videos which is open to all.

Many pages offer education vis videos but only very few give us the accurate information regarding the instrument.We strive not only to to give exact and accurate information about the instrument but also make sure is easily understood to everyone.

In this most interesting digital life, most people have found reading huge paragraphs boring and tiresome, hence through our learning procedure, you need not worry about all that.One click on the video link provided by us and you can understand every basic to sophisticated content.

The students can learn about the description,principle,operation, working , construction and other important details from our web-page itself rather than surfing different pages.Our way of conveying the information or teaching the concepts are user-friendly.

The training mainly focuses on overall exposure to the various technologies and instruments in the industry.


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Basic instruments you should know for linear measurement

Are you an engineering student or worker?

A student of engineering(Mechanical, Industrial, Electrical or civil) should know how to measure linearly and should know about common gauges used in normally every manufacturing & Production industry.

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

The Basic Fundamental unit of linear measurement in mm or inch. It is one of the seven units.

A scale is the best example to understand linear measurement. A scale in mm first instrument of every student to measure lines, the distance between two points.

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.

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

A. Vernier Caliper

Visit Page for : Analog Vernier & Digital Vernier

Or watch this Video

Subscribe for your support

B. Micrometer

Visit Page for: External Micrometer, Digital Micrometer & Depth Micrometer

Or watch this video

Subscribe for your support

C. Height Gauge

Visit Page for: Vernier Height Gauge & Digital Height Gauge

Or Watch our video

GaugeHow allows education training through YouTube videos which is open to all.

The students can learn about the description,principle,operation, working , construction and other important details from our web-page itself rather than surfing different pages.

Our way of conveying the information or teaching the concepts are user-friendly.

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Thinks needs to be considered before use any gauge

Sometime while measurement we experience unfavorable situation, that causes a lot of losses. To avoid such situation you should consider some things on your gauges, undesirable situation of gauges may loss your business and object. In this article, we discuss some reason of wrong measurement, due to condition of gauge and instrument.

Here 4 main Thinks needs to be considered before use any gauge

  1. Instrument should be clean and dust free


First think first, when you take your instrument in your hand, first check presence of dust and undesirable particles on all faces and corner of gauge. A small dust could disturb your whole measurement process.

  1. Measuring area of gauge should be shined and wear free

The main part of any instrument is measuring face for example measuring face of vernier caliper is external and internal jaws, measuring faces of plug gauge is outer diameter.

  1. Reference value (zero) should be fixed to avoid repeat-ability

Check reference valve like zero in vernier caliper and scale. The value of zero should be fixed when we change measuring length from minimum and maximum, again and again. Repeat-ability of zero value main occur in digital types of instrument due to their fluctuation sensing problem.

  1. Check Calibration Certificate

Check Certification of calibration, keep in mind due date of calibration report also check calibrated data compare with actual value of gauge to find its actual errors.

Be half of above thinks needs to be considered before use any gauge, many error we can consider like human error,environmental errors, humidity effects etc.

If you like to suggest something please mention!

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Is it possible to measure softness of our skin?

adorable baby baby feet beautiful
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Our skin is very sensitive, changes on situations and environment conditions.  Every person in our world like to have very beautiful soft skin, most of them are girls, of course!

Have you ever think about measure or comparison of our skin? suck like there any devices or instruments or soft-wares available to check out our skin softness !

Since now we do not heard such things, also this things are not available in market or everywhere, in fact we do not know about it exit in our world . On other hand measurement of our skin color is quite simple, we easily evaluate difference between black or white !!

Our skin is made of some superficial layers, according to science it would be possible to measure softness of our skin but not in a simple manner. Let me give you some examples..

First think is that,there is no such technique which gives you result directly and in easy manner. According to ASME (The American Society of Mechanical Engineering), the device called Indentation Devices Imitating  Palpation, this device work on Herts contact theory, to evaluate indentations of thin tissues. The measurement result and concept is elasticity of human skin. You can see the full report of this topic of skin at ASME website.

According to NCBT, piezoelectric tactile sensor and load cell could measure softness.




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What is seven fundamental units of Measurement ?

centimeters length measure measurement
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We measure some physical or non-physical quantity by the mean of some output results. This output results express in some units. For example we usually measure length in millimeter or meter or kilometer.

But in a standard manner, every individual type of measurement express in unique fundamental unit. According to SI standard,we have seven basic fundamental units of seven basic measurement type. This type is expressed follows

1. Mass –

The basic fundamental unit of mass is “Kg”. We also measure mass in Gram, Pound, Metric ton, Stone, Micro gram, Carat etc. Some basic relation between units are

Relation between Units of Mass

1 centigrams (cg)

10 milligrams (mg)

100 milligrams

10 centigrams

1 decigrams (dg)

10 centigrams

10 decigrams

1 gram (g)

1000 milligrams

10 decigrams

1 dekagrams (dag)

10 grams

10 dekagrams

100 grams

10 dekagrams

1 hectogram (hg)

10 hectograms

1 kilogram (kg)

10 hectograms

1000 grams

2. Time –

The basic fundamental unit of Time is “Sec(s)”. We also express time in seconds, minutes, hours, days, weeks,years etc. Some basic relation between units are

Relation between Units of Time

1 minute

60 seconds

1 Hour

60 minutes or 3600 seconds

1 Day

24 Hours or 86,400 seconds

1 Week

7 days, or 604,800 seconds

3. Electric Current –

The basic fundamental unit of Electric Current is “Ampere(A)”. Some basic Electrical & electronic units are –

Electrical & Electronic Units

Electric current (I)


Volt (V)

Voltage (V)

Ohm (Ω)

Resistance (R)


Electric power (P)

4. Amount of Substance –

Amount of Substance is a dimensionless expression of the number of particles in a particle or object. The basic fundamental unit of Amount of Substance is “Mole”. Amount of substance all called material quantity.

5. Illumination

The SI unit of Illumination is “Candela”. Candela is denoted by symbol ‘cd’. Some other units is lux, lumen etc.

6. Distance

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

1 centimeter

10 millimeters

1 meter

100 centimeters or 1,000 millimeters

1 kilometer

1,000 meters

1 inch

2.54 centimeters or 25.4 millimeters

1 foot

30.48 centimeters or 12 inches

1 yard

0.91 meters or 3 feet

1 mile

1.6 kilometers

7. Temperature

The SI unit of temperature is “kelvin”, expressed as word “K”.The temperature 0 K is known as “absolute zero.”

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)].

The relation between above two is described by follow relations –

F = 1.8C + 32

C = (F-32)/1.8

R= F+ 460

K=C + 273