Instruction of using accurate measuring tools

 week 5 - Mon - 10/02/2014 - Engineering system

instruction of using micrometer and Vernier Callipers

The Micrometer

The micrometer is a accurate measuring tools, used by engineer. Usually used for measuring small range of objects and gears.

Each rotation of the Rachet makes the spindle face moves 0.5mm towards the Anvil Face, an object to be measured is placed between the ANVIL FACE and the SPINDLE FACE. The rachet is turned clockwise until the object is ‘trapped’ between these two surfaces and the rachet makes a ‘clicking’ noise. This means that the rachet cannot be tightened any more and the measurement can be read.


The measurement on sleeve with each lines present full millimetres(mm) and below the full mm lines shows the 0.5mm scales which is below the line of written number. The measurement line on the Thimble present the measurement that adds up to the 0.05 mm.

example of reading the measurement of an object is shown below:

Sleeve (top + Below scale): 

Top scale = 13mm

Thimble = 0.43 

Total measurement of the round object  = 13.43

There is also the measuring tools call the The Depth Gauge Micrometer used for measuring the depth of an object and can be measure the same way as Micrometer.






Vernier Calliper

This measuring tools is also use for measuring the engineering object precisely, mostly used by Engineer. When it comes to measuring the cup shape cylinder, this tools is very useful.

The instruction of Using Calliper is start by sliding the jaw to the wideness of an object you want to measure then locking the screw will prevent the External or Internal jaw to moves.

Next you start off by looking at the measuring metric scale on the rule to read the measurement . Example:

There is another type of measuring tools called Digital Calliper which calculated on it's own and display the measurement on the screen and it's much easier to use.