What is telescopic gauge? - Metrology & Quality Control

Q.  What is the type of instrument shown below?
- Published on 07 Aug 15

a. Bore gauge
b. Telescopic gauge
c. Slip gauge
d. None of the above

ANSWER: Telescopic gauge


  • Sravanthi   -Posted on 13 Oct 15
    Telescopic gauge is an indirect measuring instrument. It is used to measure diameters of holes during machining. Telescopic gauge consists of two spherical contacts which are at the ends of two rods within a tube.

    To measure the diameter of workpiece, the gauge head is inserted inside the workpiece whose diameters is to be measured. The locking screw is used to lock the position of rods. The contact rods are locked before inserting the gauge into the workpiece, so that it can be easily inserted and then again it is unlocked so that the spherical rods develop contact with the workpiece. The distance between these two contact rods is measured using a micrometer or vernier caliper.

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