Page 101 - CITS - Fitter Trade Pactical - Volume - 2
P. 101

FITTER - CITS



           EXERCISE 30: Exercise on tapping through and blind holes

                                    to suit stud & bolt


            Objectives

           At the end of this exercise you shall be able to
           •  determine the hole size for tapping
           •  chamfer the holes for tapping
           •  set the tap in the hole
           •  set the height for blind hole
           •  drilling blind hole
           •  cut internal threads in through and blind holes using hand tap and tap wrench.





































           Job Sequence

           Cut internal thread in through hole

           •  Use old finished job for this excercise.
           •  Make throughout hole (8.5mm dia) for making M10 thread.
           •  Fix the job in bench vice.
           •  Fix M 10 first tap in tap wrench and cut internal thread in through hole.
           •  Similarly, fix M 10 second tap and third tap in tap wrench one by one and cut the internal thread to form full
              thread.
           •  Repeat the above process to cut internal thread in other drilled through hole.
           Cut internal thread in blind hole
           •  Remove metal chips if any from the blind hole by turning it upside down and slightly tapping it on a wooden
              surface.



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