Page 108 - CITS - Fitter Trade Pactical - Volume - 2

FITTER - CITS

• Similarly, fix Ø 9.8 mm drill in drill chuck and drill through holes in ream hole locations.
• Fix counter sink tool in drilling machine and counter sink two holes to the required depth.
• Similarly, fix counter bore tool in drilling machine and counter bore two holes to the required depth.
• Ream in Ø 9.8 mm two drilled holes using Ø 10 mm hand reamer with wrench.

• Hold spot facing tool in drilling machine and spot face two holes to required depth .
• Fix drill Ø 5.8mm and drilled 01 hole in part 1 & 2 .
• Reamed 01 hole part 1 and 2 using Reamer Ø 6mm for dowel pins.
• Check all the dimensions using Vernier caliper.

• Hold part 1 in bench vice.
• Cut and remove excess metal by hacksawing.
• File to size and shape as per job drawing.
• Similarly, repeat the above process in part 2 and complete the job.
PART - 3
• Mark the dimension lines as per drawing and punch witness marks in part 3.

• Cut and remove excess metal by sawing and file to size and shape as per drawing.
• Mark the hole centres using centre punch.
• Fix drill Ø 5.8mm and drilled 02 holes .
• Reamed 02 holes using Reamer Ø 6mm for dowel pins.

• Check all the dimensions using Vernier caliper.
• Match part 1, 2 ,3 and fit dowel pins Ø 6mm.
• De - burr in all the surfaces and corners of the jobs.
• Apply oil and preserve it for evaluation.

Skill Sequence
Job Sequence

Counter sink

Objectives : At the end of this exercise you shall be able to
• state counter sink.

Fix the job in the machine vice (if necessary, use parallel blocks) and set it square.
Align the machine spindle with the drilled hole to be countersunk. (Fig 1)
Remove the drill and fix the countersink tool on the machine without disturbing the alignment. (Fig 2)

Fig 1 Fig 2

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CITS : CG & M - Fitter - Exercise 31