Metrology and Quality Control - Mechanical Engineering (MCQ) questions and answers for Q. 4955

Q.  What is/are the factor(s) causing runout?
- Published on 07 Aug 15

a. Error of position
b. Error of bearings
c. Both a and b
d. None of the above

ANSWER: Both a and b

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    Discussion

  • Sravanthi   -Posted on 23 Oct 15
    - The distance between intersection of geometrical axis and actual axis of rotation with a plane perpendicular to axis of rotation is called as runout.

    Factors causing runout are:

    1) Error of position: They are caused due to deviation in trajectory points on the section of a surface in relation to axis of rotation.

    2) Error of bearings: They are caused if bearing surfaces or bores are not exactly circular due to axis of rotation.

    3) For shaft, out of roundness is defined as the difference between diameter of inscribed circle and smallest diameter of the shaft.

    4) For hole, out of roundness is defined as difference between diameter of inscribed circle and largest diameter of the hole.

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