What are the errors in micrometer screw gauge?

Answer 1

This micrometer has zero error.

The zero marking on the thimble is below the datum line. So this micrometer

has a positive zero error.

In this case we will take the reading on the thimble.

Thimble reading = 0.03 mm

So the micrometer has a zero error of +0.03 mm.

Whatever reading we take on this micrometer we would have to subtract +0.03 mm

The zero marking on the thimble is above the datum line. So this micrometer

has a negative zero error.

In this case we will have to count the number of divisions on the thimble between the zero marking and the datum line.

No. of divisions = 3

Measurement of each division = 0.01mm

So the micrometer has a zero error of -0.03 mm.

Whatever reading we take on this micrometer we would have to subtract -0.03 mm

Answer 2

The micrometer must be checked for any 0 error. There are 2 types of errors in micro meter one is the +ve 0 error while the other is the - ve 0 error. Before placing the object to be measured b/w the anvil and the spindle, turn the thimble until the anvil and the spindle meet. If the 0 mark on the thimble scale lies directly opposite the datum line of the main scale, we say that there is no 0 error. But if 0 goes down the datum line it is known as +ve 0 error ,similarly. when 0 goes up from the datum line it is known as -ve 0 error.

To make your reading pure from error;

• subtract the 0 error from the total reading, if it is +ve error.
• add the 0 error in the total reading ,if it is -ve error.

Answer 3

Some common errors in micrometer screw gauges include zero error (incorrect zero point calibration), parallax error (viewing angle affecting measurement reading), and frictional errors (resulting from wear or inadequate lubrication of the screw mechanism). Regular calibration and maintenance can help reduce these errors.