Measurement of base pitch of gear in base tangent method - Metrology & Quality Control

Q.  Which of the following instruments is used to measure base pitch of a gear in base tangent method?
- Published on 07 Aug 15

a. Gear tooth vernier caliper
b. David Brown tangent caliper
c. David Brown tangent comparator
d. David Brown tangent micrometer

ANSWER: David Brown tangent comparator

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    Discussion

  • Sravanthi   -Posted on 26 Oct 15
    - Base tangent method is used to check tooth thickness. In this method David Brown tangent comparator is used to measure base pitch of gears.

    - This tangent comparator is used to measure base length between two parallel planes. These parallel planes are tangential to two opposing tooth flanks in a gear.

    - If the comparator used has back lash allowance then this amount is subtracted from the calculated values of base tangent methods.

    - If this method of measurement is used then only one vernier is involved and if gear tooth vernier is used two verniers are used for measurement.

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