Page 105 - CITS - Fitter Trade Pactical - Volume - 2
P. 105

FITTER - CITS


           Internal threading blind holes using hand taps

           Objectives: At the end of this exercise you shall be able to
           •  practice Internal threading blind holes using hand taps.



           Drilling a blind hole

           Determine the tapping drill size using the table for tapping drill sizes.
           Drill a blind hole using the depth stop arrangement. The depth of the tapping hole should be slightly more than the
           depth of the required thread. (Fig 1)

              Fig 1















           Procedure for threading
           Remove metal chips, if any, from the blind hole by turning it upside down and slightly tapping it on a wooden
           surface.

              Do not clear the chips by blowing as it can cause injury to your eyes.

           Screw a matching nut on the first tap to act as a depth stop. (Fig 2)

           Thread the blind hole until the nut touches the plate surface.
           Remove the chips from the hole frequently, using a flattened and bend wire. (Fig 3)

              Fig 2                                         Fig 3





































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                                            CITS : CG & M - Fitter - Exercise 30
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