Page 78 - CITS - Fitter Trade Practical - Volume -2
P. 78

FITTER - CITS



              Fig 3



































           Job Sequence

           TASK 1: Making top plate
           •  Check the raw material.
           •  File and finish the job 52 X 110 X 14mm as per drawing.
           •  Mark the hole centres.

           •  Set the job on drilling machine.
           •  Drill the holes Æ 5.8mm for reaming.
           •  Ream the hole using 6mm reamer.
           •  Drill 2 holes of Æ 8.5mm for inserting hook bolt.

           •  Drill 4 nos of Æ 11.8mm for fixing bush.
           •  Ream the Æ 11.8mm hole using 12mm reamer to get H7 finish.
           •  Remove burr in the sharp corner.

           TASK 2: Making knob
           •  Check the raw material.
           •  Hold the job in 3 jaw chuck.

           •  Make centre drill and enlarge the hole to Æ 7mm ± 0.1.
           •  Turn dia  to a length of 20mm.
           •  Turn step dia  to length of 10mm.
           •  Knurl as per drawing.
           •  Reverse the job hold the knurled portion with soft packings.

           •  Face to a length of 16 mm.
           •  Chamfer as per drawing.


                                                           63

                                            CITS : C G & M - Fitter - Exercise 66
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