Page 58 - CITS - Fitter Trade Practical - Volume -2
P. 58

FITTER - CITS


           EXERCISE 63 : Drill through and blind holes at an angle
                                     using swivel table of drilling


            Objectives

           At the end of this exercise you shall be able to
           •   file surface and right angle and check with try square
           •   file to size maintaining accuracy  0.02mm
           •   align the job for angular drilling
           •   drill angular through hole
           •   drill angular blind hole.





































            Job sequence


           •   Check the raw material for its size.
           •   Mark the required size and cut by hacksawing.
           •   File to size 75x24x24mm and check with vernier caliper.

           •   Mark the given dimension for drilling location as per size by using vernier height gauge.
           •   Punch on correct locations of drills
           •   Hold the work piece in the machine horizontally by keeping the parallel blocks under the work piece to avoid
              drill bit tip touch the metal base of machine vice.
           •   Check with spirit level.
           •   Clamp the machine vice to the drilling machine universal table.
           •   Lock and arrest the table rotation in ‘z’ axis.

           •   Tilt the drilling machine table at an angle of 15°, lock it, and drill hole to the required depth.
           •   Align the spindle centre and hole location using locating pin.



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