Why are pitch errors observed in threads? - Metrology & Quality Control

Q.  Why are pitch errors observed in threads?
- Published on 07 Aug 15

a. Lack of inspection
b. Incorrect ratio of tool work velocity
c. Interference between mating parts
d. All of the above

ANSWER: Incorrect ratio of tool work velocity

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    Discussion

  • MUDAVATH SANTHOSH   -Posted on 13 Dec 22
    These errors are caused if ratio between linear velocity of tool and angular velocities of workpieces is not constant.
  • ian   -Posted on 17 Mar 20
    good presentation
  • saravana   -Posted on 08 Jul 16
    Pitch angle difference error why occurred and what's the reason
  • Sravanthi   -Posted on 26 Oct 15
    - Errors in threads are observed in thread angles, minor, major or effective diameters.

    - Pitch errors are caused if constant ratio between linear velocity of tool and angular velocities of workpieces during thread cutting are not maintained. This is caused due to wrong selection of gears or due to pitch errors in lead screw.

    - Thread engagement becomes either too slow or too high, if any pitch error is observed over the thread.

    - Different types of pitch errors are:

    1) Drunken error: It is a periodic pitch error which repeats at an interval of one pitch.

    2) Irregular error: These errors are caused due to variations in cutting parameters, machining setup, etc

    3) Progressive error: These errors are caused due to incorrect tool work ratio, even if it is constant.

    4) Periodic error: These errors are caused if ratio between linear velocity of tool and angular velocities of workpieces is not constant.

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