Page 91 - Turner 1st sem Practicals

Job sequence

Three jaw chucks • Four jaw chucks

• Clean the chuck body with cotton waste. • Clean the chuck's body with cotton waste.
• Rotate any one of the pinion in anticlockwise direction • Check the function of the chuck.
with the chuck key.
• Remove all the four jaws individually by rotating the
• Remove all the three jaws one after another by rotating. screws in anticlockwise direction by a chuck key.
• Remove the back plate by unscrewing the screws bolts. • Remove the fork pins by unscrewing the locking screws.

• Separate the pinions by removing curved keys. Remove the driving screws.
• Repair or replace the worn out parts.
• Remove scroll disc from the chuck body.
• Clean all the parts with kerosene oil.
• Clean all the parts with kerosene oil.
• Lubricate all the moving surfaces with grease.
• Lubricate the sliding surfaces with grease.
• Re-assemble all the parts in reverse sequence.
• Reassemble all the parts in the reverse sequence.

• Mount the chuck on the machine spindle. • Mount the chuck on the machine spindle.
• Take a trial run of the chuck and check its function.
• Take a trial run of the chuck and check the function.

Skill sequence

Dismantling and assembling of lathe chuck

Objectives: This shall help you to
• dismantle a lathe chuck
• lubricate and re-assemble the lathe chuck.
3 jaw self centering chuck Lubricate the sliding /moving surfaces with servogem No.

Clean the chucks body with cotton waste. 2 grease.
Reassemble all the part in the reverse sequence.
Inspect the function of the chuck.
Remove all the three jaws, one after another by rotating any
one of the pinions in anticlockwise direction with the chuck
key.
Remove the back plate by unscrewing the screws /bolts
and separate the pinions by removing curved keys.
Remove scroll disc from the chuck body.

All the 3 jaws both forward set and reverse set are
marked as 1,2,3 which must be fitted serially, one
by one, into the slots provided for the particular
jaws.
Take a trial run of the chuck and check its function.
Use proper allen key, screwdriver, soft hammer,
copper drift etc to avoid damage of the parts. 4 jaw independent chuck
Repair or replace the broken /wornout parts, if any. Clean the chuck's body with cotton waste.
Clean all the parts with kerosene oil and wipe off with a Check the function of the chuck.
banian cloth.
Producltion & Manufacturing : Turner - Exercise 1.3.26 79