Use of Parkinsons gear tester to measure variation in centre distance - Metrology & Quality Control

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

a. Parkinson's gear tester is used to measure variation in centre distance
b. Tool maker's microscope is used to measure tooth thickness
c. Teeth having wider flanks have less strength
d. All the above statements are true

ANSWER: Parkinson's gear tester is used to measure variation in centre distance

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    Discussion

  • Sravanthi   -Posted on 26 Oct 15
    - Strength of teeth in cycloidal tooth profile increases due to wider flanks.

    Parkinson's gear tester

    - Parkinson's gear tester is used to measure variation in centre distance between two gears caused due to error in tooth form, concentricity of pitch line, etc.

    - This gear tester is suitable for spur gears having diameter range of 160 mm to 300 mm and has an accuracy of ± 1 micron.

    - The instrument sensitivity is affected by the friction during the movement of floating carriage.


    Tool maker's microscope

    - This microscope is used to inspect gauges, tools, jigs, dies and fixtures, etc,. Tool maker's microscope is direct measuring instrument.

    - Longitudinal range of 100 mm and cross range of 50 mm is observed in this microscope. Screw obtains 50 mm of longitudinal movement and remaining 50 mm is obtained by insertion of gauge blocks.

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