Page 161 - Turner 1st sem Practicals

Job sequence

• Check the raw material size. • Knurl the surface till a square shape is formed.
• Hold the material secured in a 4 jaw chuck projecting • Chamfer to 3 x 45° at the end with a 45° chamfering
50 mm outside the chuck. tool.
• True the job with a surface gauge and face the end. • Undercut and maintain Ø23 and groove with a 5 mm
width grooving tool.
• Turn the job to Ø40.00 - 0.2 for more than the required
length for knurling. • Deburr all sharp edges.
• Hold the diamond knurling tool securely and set it to Remember
the centre height. • Avoid overhanging of the tool.

• Select the suitable speed for the knurling operation. • Use aluminium pieces for packing, to avoid marks on
• Knurl the surface till a diamond shape is formed. the knurled surface.
• Chamfer 2 x 45° at the end. Safety precautions
• Reverse and hold the job in the chuck and true the job. • Never operate a lever when the machine is in motion.
• Face the end and maintain the length of 80 mm. • Do not keep any tools on the moving parts of the
machine.
• Turn the job to Ø25 x 50 with a side knife tool. (Use a
vernier caliper for measuring dimensions.) • Use a suitable coolant.
• Turn the job to Ø25 - 0.2 for 25mm length from face
end.

148 Producltion & Manufacturing : Turner - Exercise 1.3.45