Page 82 - Turner 1st sem Practicals

Do not use power to mount a chuck on spindle Lubricate the mating surfaces with a light film of oil.
noses. After mounting

Clean all the mating parts of the chuck and spindle as, Set the speed-change lever to the slowest speed.
otherwise, the dirt on these surfaces could result in the
following. Switch on the motor.
Damage the threads or taper on the spidle or chuck.(Fig 1) Engage the clutch lever.
The chuck would now begin revolving.
Check that the diameter and face of the chuck are running
true by observing the surfaces.
Mounting chuck on to the threaded spindle (Fig 4)

Switch off the motor.
Place the chuck on the wooden plank or cradle and slide
it close to the spindle nose.

Turn the spindle anticlockwise by hand and engage the
chuck on the spindle threads. (Fig 4)

To prevent such damage from occuring, take the following
steps.
Place a wooden board on the lathe bed when mounting light
chucks to prevent damage to the slideways. (Fig 2)

Set the speed-change lever to the slowest speed. Screw
the chuck in until it fits firmly on the spindle.
The chuck should easily screw into the spindle. If any
For large chucks place a wooden cradle between the resistance is felt, remove the chuck and check that the
chucks and the lathe bed. (Fig 3)
threads are clean and not damaged.
Mounting on tapered spindle (Fig 5)

In addition to protecting the bed slideways it makes fitting
the chuck easier and safer.

Always seek assistance when mounting large and heavy
chucks.

70 Producltion & Manufacturing : Turner - Exercise 1.3.24