Page 65 - CITS - Fitter Trade Pactical - Volume - 2
P. 65

FITTER - CITS



           EXERCISE 17 :   Exercise on chipping a flat surface on mild

                                        steel & cast Iron blocks, with a flat & cross

                                        cut chisel


           Objectives


           At the end of this exercise you will be able to
           •  chip surfaces evenly using a flat chisel.
           •  chip curve on flat bearing surface with uniform round nose chisel
           •  chisel/half round chisel.
           •  chip keyways at various angles with cross cut and diamond point chisel.




              Note: Each trainee should practice chipping of 3 layers of 1.5 mm deep.




























           Job Sequence
           Job Sequence

           •  Apply marking media and mark the depth of  metal to be removed by chipping.
           •  Punch the marked line with a dot punch.
           •  Hold the job firmly in the vice.
           •  Support the job with wooden block while chipping.


              If necessary give a wooden support below the work piece so that the marked line should be above
              the vice jaw face.

           •  Select a flat chisel 20 mm width with  proper cutting edge.
           •  Select a ball pein hammer of 1 kg.
           •  Hold the chisel at approximately 35° angle of inclination in chipping position.

           •  Hold the hammer at the end of the handle to get more leverage.

              Caution: Chisel should be free from  mushroom head.



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