Page 111 - Turner 1st sem Practicals

Production & Manufacturing Exercise 1.3.33
Turner - Turning

Centre drilling and drilling to a required size
Objectives : At the end of this exercise you shall be able to
• set the job on a four jaw chuck
• set the tool to the centre height
• centre drill on a job
• drill through hole.

Job sequence

• Check the raw material size. • Drill through hole in the job with Ø10mm drill bit after
centre drilling.
• Hold the job in a four jaw independent chuck with
40mm overhang and true it. • Drill through hole in the job with Ø18mm drill bit after
drilling 10mm.
• Set the right hand facing tool in the tool post.
o
• Chamfer the drilled hole 1x45 .
• Face one end of the work.
• Reverse the job and reset it.
• Fix the drill chuck in the tailstock spindle and fix the
centre drill of size A2x6.3 IS : 2473. • Face the other end maintain to 60mm length.
• Centre drill the work. • Turn the outer dia 40mm to length 25mm.
• Turn the outerdia 40 mm to the length 35mm. • Chamfer the hole 1x45 o

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