Question

Which of the following is incorrect about precautions in using a micrometer?

(a) Final movement is given by ratchet

(b) Thimble is turned till the Measuring tip just touches the part to be measured

(c) Part to be measured is held in right hand and micrometer in left hand for good results

(d) Error is reading is may be due to lack of flatness of anvil

This question was posed to me by my college director while I was bunking the class.

Enquiry is from Micrometers in division Linear Measurements of Engineering Metrology

Answer 1

Correct option is (c) Part to be measured is held in right hand and micrometer in left hand for good results

To elaborate: The part to be measured must be in left hand and micrometer in the right hand for better results. Place small finger and adjoining finger in the U frame. Middle finger supports micrometer and forefinger and thumb are placed near the thimble. This is the correct way of using a micrometer.