Page 159 - Turner 1st sem Practicals

Job sequence

TASK 1 : Drill and boring

• Check the raw material for its size. • Drill the job, up to dia 24mm through its full length
35mm.
• Set the 50mm dia job on a four jaw independent chuck
with maximum possible projection. • Set the boring tool on tool post to correct centre height.
• True it with help of surface gauge. • Boring upto dia 25mm full length.
• Set the turning tool to the tool post with correct centre • Reverse and hold the job in the chuck and true the job.
height.
• Face the end and maintain the total length 35mm and
• Select the correct rpm. turn Ø 48mm remaining length.
• Face one end and turn Ø48mm to a length 20mm.
• Put the centre drill and pilot drill Ø10mm and enlarge
16mm drill.

TASK 2 : Turning

• Check the raw material size. • Turn the job upto dia 25.04mm length 39mm.
• Hold the job 32mm Ø in a four jaw chuck with maximum • Set the chamfering tool and chamfer the edge.
possible projection. • Part the job upto length 40mm.

• True it with help of surface gauge. • Fit task 1 and task 2.
• Set the tool to the tool post with correct centre height.
• Set the assemble job on four jaw chuck and true it with
• Set the correct rpm for non ferrous metal. help of surface gauge.
• Face it one end. • Face the other end up to 35mm length.

146 Producltion & Manufacturing : Turner - Exercise 1.3.44