Measurement of small angles in clinometer - Metrology & Quality Control

Q.  Which of the following is true?
- Published on 07 Aug 15

a. Ring gauge has a taper angle of 3 Φ
b. Clinometer cannot measure angle between two adjacent surfaces
c. Clinometer uses micrometer to measure small angles
d. All of the above

ANSWER: Clinometer uses micrometer to measure small angles

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    Discussion

  • Sravanthi   -Posted on 13 Oct 15
    Ring gauge has a taper angle of 2 Φ. Micrometer clinometer uses a micrometer to measure small angles.

    Half taper angle can be measured using the formula,

    tan Φ = (r2 – r1) / [ (h2 – h1) – (r2 – r1)]
    here,
    r2, r1 are the diameters of small and large disk, h2, h1 are heights from the datum.

    Clinometer is used to measure angle between two adjacent surfaces by using a spirit level mounted on a rotary arm. A circular scale is used to find angle between adjacent faces of a work piece. The base of clinometer is placed on one face of workpiece and the rotary arm is adjusted until the spirit level attains zero reading. The rotation angle of rotary arm is noted by the circular scale. Similarly, a second reading is noted on the other face and the difference between these two readings is the required angle between two adjacent faces. Precision microscopic clinometers are also to check gauges, relief angles on cutting tools, jigs and fixtures etc.

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