Method used to test straightness of object - Metrology & Quality Control

Q.  Which method is used to test the straightness of an object?
- Published on 07 Aug 15

a. Indicator method
b. Interference method
c. Wedge method
d. All of the above

ANSWER: Wedge method

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    Discussion

  • Mark    -Posted on 16 Apr 20
    The methods where expressed in a good way
  • Sravanthi   -Posted on 23 Oct 15
    - Straightness of a surface can be measured using spirit level, autocollimator, straight edge and wedge.

    - Wedge method is used to test the straightness of an object. In this method, two slip gauges of different lengths are used on which the surface to be tested is placed. The distance between two slip gauges is divided into equal parts. This specimen is checked at different points and is concluded that the surface is not straight because the gap between slip gauges at different points is dissimilar.

    - Interference method is used to measure flatness of a surface. The dark and light fringes obtained when a monochromatic light passes through optical flat determines whether the surface is flat or irregular. If no bands are obtained the surface is considered as perfectly flat.

    - The indicator method is used for testing squareness of a workpiece. It checks whether the four faces of rectangle are perpendicular to the adjacent faces.

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