Page 79 - CITS - Fitter Trade Practical - Volume -2
P. 79

FITTER - CITS



           •  Remove the job from lathe, hold on bench vice and make the thread of  M8 using tap.
           •  Remove the burrs.
           •  Repeat the above for other knob.



           TASK 3: Making jig bush
           •  Check the raw material.
           •  Hold the job in three jaw chuck.
           •  Face, centre drill and enlarge the hole to dia 5.8mm.
           •  Ream the hole Æ 6mm.
           •  Turn dia 18mm to required length.
           •  Turn step of dia 12mm to a length of 15mm.

           •  Chamfer the end of dia 12mm.
           •  Part to a length of 21mm.
           •  Repeat the same for 4 pieces.
           •  Hold the dia 12mm and face the other side to a length of 20mm.
           •  Chamfer as per drawing.
           •  Remove the burrs.


           TASK 4: Making hook bolt
           •  Check the raw material.
           •  Bend the rod as per drawing using anvil and hammer.

           •  File flat surface as per section ‘AA’.
           •  Chamfer the length side for threading.
           •  Make thread using 8mm hand die with stock.
           •  Check the thread using Æ 8mm nut

           •  Finish as per drawing.
           Drill jig assembly
           •  Clean all the parts.
           •  Deburr sharp corners if any.
           •  Fit the bush (Task 3) in the top plate (Task 2).
           •  Fix the Æ 6mm X 16mm dowel pin on the top plate.

           •  Fix the hook bolt 2 nos.
           •  Screw the knob in hook bolt.
           •  Insert the channel to be drilled.
           •  Now the drill jig is ready for drilling.
















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                                            CITS : C G & M - Fitter - Exercise 66
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