Relation between cumulative pitch error & length of thread - Metrology & Quality Control

Q.  Which type of errors show linear relation between cumulative pitch error and length of thread?
- Published on 07 Aug 15

a. Periodic errors
b. Progressive errors
c. Both a. and b.
d. None of the above

ANSWER: Progressive errors

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    Discussion

  • Sravanthi   -Posted on 26 Oct 15
    - Progressive Errors are a sub-type of Pitch errors.

    - Progressive errors are caused if tool work velocity ratio is incorrect, even if it is constant.

    - These errors are caused if incorrect gears are used.

    - Progressive errors show linear relation between cumulative pitch error and length of thread. As length of thread increases cumulative pitch error also increases.

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