Page 107 - CITS - Fitter Trade Pactical - Volume - 2
P. 107

FITTER - CITS



           EXERCISE 31: Demonstration and  exercise on  counter

                                    bore,  counter  sink,  spot  facing  reaming
                                    holes - three pieces fitting with dowel pins



            Objectives

           At the end of this exercise you shall be able to
           •  mark the lines as per job drawing
           •  drill, counter sink, counter bore and ream the holes as per drawing
           •  drill, spot face as per drawing .
           •  cut and remove excess metal in part 1, 2 and 3.
           •  file and finish to size and shape,
           •  make  and fit using dowel pins  as per drawing.









































           Job Sequence


           •  Check the raw material for its size.
           •  File and finish to over all size of part 1 and 2 to 80x50x9 mm, part 3 to the size of 40x30x9 mm maintaining
              parallelism and perpendicularity.
           •  Mark the hole centres using centre punch and punching in part 1, 2 and 3 as per drawing..

           •  Mark the hole centres using centre drill .
           •  Fix the job in drilling machine table with suitable clamps.
           •  Fix centre drill in drilling machine spindle through drill chuck and drill centre drilling in all drill holes centres.
           •  Fix Ø 6 mm drill in drill chuck and drill through holes  a  sper drawing in all centre in drilled holes.



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