To find out the Radius of Circle of any Job having a Portion of a Circle (Metrology)

This method requires the use of surface plate, Vernier caliper, C-clamp and two pins of equal size. This method could be best applied to jobs like cap of a bearing. The job is first clamped to surface plate with the help of C-clamp. It should be clamped in such a way that central position of the circular part is in contact with the surface plate as far as possible. Then
two pms of equal diameter are placed on each side of the work as shown in Fig. 9.14 and the reading over the balls is taken with the Vernier caliper. Let the reading be I. Let the diameter of pins be d and radius of job R.
tmp3C60_thumbFig. 9.14
Fig. 9.14

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