Micrometer and it's main parts

Micrometer and It's Parts:

 Micrometer

 

Micrometer:

The micrometer may be a precision measuring system, employed by engineers. Each revolution of the rachet moves the spindle face 0.5mm towards the anvil face. The object to be measured is placed between the anvil face and the spindle face. The rachet is turned clockwise until the thing is ‘trapped’ between these two surfaces and therefore the rachet makes a ‘clicking’ noise. This means that the rachet can't be tightened anymore and therefore the measurement are often read.

 Main Parts of Micrometer:

1.     Main Frame

2.     Zero adjusts screw

3.     Anvil

4.     Spindle

5.     Anvil Face and Spindle Face

6.     Lock Nut

7.     Sleeve

8.     Thimble

9.     Rachet

1.     Main Frame:

It’s a c shaped frame as identified within the figure, may be a rigid part that has both holding points for employment or object to be measured. Its size depends on micrometer measuring range so size of c frame increases as range expands to greater. Its main function is to provide basic structure of a micrometer during which stationary anvil located at one end and moveable spindle slides inward or outward trough other end of c frame.

2.     Zero adjusts screw:

It’s a screw located rear of anvil shown in figure. As name shows it's to correct or adjust the zero error of micrometer if there's some error found before the measurement during test.

3.     Anvil:

It is alittle stationary cylindrical a part of micrometer located in far end of c-frame and acts together holding point for measuring objects. So we will say it’s a 1 of rigid measuring and holding point of micrometer.

4.     Spindle:

A cylindrical long part which is mounted through all other parts sleeve, lock nut and thimble. It is moveable part and features a reference to ratchet as we rotate the ratchet clockwise or counter clockwise the spindle slides out or inward to regulate it with compare to measuring object size.

5.     Anvil Face and Spindle Face:

Faces of both anvil and spindle which are opposite to every other are the measuring points of micrometer and hold the measuring object collectively.

6.     Lock nut:

As we all know the mechanism of micrometer supported precision ground threads of spindle therefore the lock nut works as stationary nut for this mechanism, so rotation of this mechanism into lock nut controls the spindle movement.

7.     Sleeve:

It’s a barrel type cylindrical part which mounted on spindle and is main scale of micrometer because main scale is engraved on the sleeve .Thimble rotates around that sleeve and spindle. Its main function is indication of reading in millimeter just in case of imperial micrometer.

8.     Thimble:

Thimble is additionally mounted on spindle and a scale is engraved around it perimeter of thimble. Scale of thimble is to point out the measurement value in fraction.

9.     Ratchet:

It’s a knurled thumb gripe to rotate the spindle into desired direction for measuring process, given ratchet action to avoid over tightening of micrometer across the measuring object and also ensures equal pressure force of each measurement.