Page 66 - Turner 1st sem Practicals

Job sequence

TASK 1

• Check the raw material size. • Fix Ø8mm drill in the chuck rigidly.
• File the job and finish the job as per dimension. • Set the spindle speed.
• Apply the chalk powder and allow it do dry. • Use a coolant and drill Ø8mm holes.
• Mark and punch the holes centres with a centre punch • In the same way continue drilling for the remaining
and draw circles as per drawing. holes.
• Fix the vice on the drilling machine table. Pilot hole drilling should be done for holes of
• Fix the job in the vice for drilling. Ø12 mm.
• Deburr the edges of the holes with drills 3 to 5mm bigger
• Fix the drill chuck into the machine spindle.
in size than the hole sizes.

TASK 2

• Check the raw material size. • Fix 10mm drill in the chuck rigidly.
• File the job if any burr is there. • Set the spindle speed.

• Apply the chalk powder and allow it to dry. • Use a coolant and drill 10mm holes.
• Mark and punch the hole centres with a centre punch • In the same way continue drilling for the remaining
and draw circles as per drawing. holes.

• Fix the vice on the drilling machine table. Pilot hole drilling should be done for holes of
Ø10 mm.
• Fi x the job in the vice for drilling.
• Deburr the edges of the holes with drills 3 to 5mm bigger
• Fix the drill chuck into the machine spindle. in size than the hole sizes.

TASK 3

• Check the raw material size. • Fix the 8mm drill in the chuck rigidly.
• File the job in correct length. • Set the spindle speed.
• Mark and punch the holes centre with a centre punch. • Set the depth using the depth bar in drilling M/C.
• Draw the circle as per drawing. • Use coolant and drill pilot 8mm hole.
• Fix the vice on the drilling machine table. • Fix the 12mm drill in the chuck rigidly and set the
• Fi x the job in the vice for drilling using 'Y' block spindle speed.

• Fix the drill chuck in to the machine spindle. • Use coolant and drill 12mm hole length of 20mm.

Skill sequence

To set vice on the machine table in position

Objective: This shall help you to
• align a machine vice on the table in position.

Clean the vice base and the machine table top, free from Position the 'T' bolts into the 'T' slot. (Fig.1) while shifting
dust for seating. the vice towards the slots ensure that there is 1mm to
Place the vice at the middle of the table with maximum 2mm clearance between the 'T' bolt and the vice slot to
support to avoid falling off of the vice. (Fig.1) allow for adjustment.
Tighten all the bolts by hand.

54 Producltion & Manufacturing : Turner - Exercise 1.2.19