Mechanical comparators & Sigma comparator - Metrology & Quality Control

Q.  Which of the following statements are true?

1. Mechanical comparators are compact and easy to handle
2. Parallax error is never observed in mechanical comparator
3. Sigma comparator is a type of mechanical comparator
4. Mechanical comparators have low inertia which makes them sensitive to vibrations
- Published on 07 Aug 15

a. 1 and 2
b. 3 and 4
c. 1 and 3
d. All of the above

ANSWER: 1 and 3

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    Discussion

  • Sravanthi   -Posted on 23 Oct 15
    - Mechanical comparators such as sigma comparator, Johansson Mikrocator are compact, robust and easy to handle. The scale system used in mechanical comparators leads to parallax error which is caused due to wrong visualization.

    - Mechanical comparators are sensitive to vibrations due to high inertia.

    - The accuracy of instruments is affected due to friction between moving parts.

    - The range of mechanical comparators is limited.

    - They are easy to measure due to linear scale and do not require any external source of energy.

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