Page 92 - CITS - Fitter Trade Pactical - Volume - 2
P. 92

FITTER - CITS




           EXERCISE 28:  Practice on  drilling  through  and  blind
                                     holes on ferrous & non-ferrous metals to a

                                     positional accuracy of ±0.10mm




            Objectives

           At the end of this exercise you shall be able to
           •  mark drill hole centres using vernier height gauge
           •  set the correct spindle speed in drilling machine
           •  drill through hole as per drawing
           •  set the depth bar to drill blind hole
           •  drill blind hole to the required depth size.
           •  drill on ferrous and non- ferrous metal.







































           Job Sequence

           •  Check the raw material size.

           •  File and finish the metal to size 60 x 60 x 19 mm maintaining parallelism and perpendicularity.
           •  Check the flatness and squareness with try square  and  size with vernier caliper.
           •  Apply marking  media and mark  drill holes centres using vernier height gauge as per drawing.
           •  Punch on drill holes centres using centre punch 90°
           •  Hold the job in drilling machine table.

           •  Make centre drill in drill holes centres.



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 CITS : CG & M - Fitter - Exercise 27
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