Page 84 - Turner 1st sem Practicals

Dismounting chucks rom a threaded spindle (Fig 10) Turn the lathe spindle clockwise by hand to loosen the
chuck from the spindle nose.
Remove the wooden block.

Place the wooden block or cradle on the lathe bed.
Unscrew the chuck from the spindle.
Clean and store the chuck (Fig 11)

Switch off the motor.
Set the speed-change lever to the slowest speed.

Place a solid wooden block between one of the chuck jaws
and the rear of the lathe-bed.
The length of the wooden block should be slightly less than
the centre height of the lathe.

Dismounting and mounting chucks

Objective: This shall help you to
• dismount and mount chucks from a spindle nose.

Depending upon nature and delicacy of operations, different
work-holding devices are to be mounted and dismounted
on to the lathe spindle nose.
Dismounting a chuck

Hold Ø30x300mm iron piece projecting about 200mm
more than the chuck to enable easy and safe lifting.
Set the spindle to the lowest speed.
Place a wooden block in the gap between the chuck body
and the lathe bed. The thickness of the wooden block
should be such that it can freely enter in the above gap.

Open the chuck from the spindle nose. (Fig 12)

Clean and store the chuck.
Mounting a chuck
Depending upon the type of spindle nose and the type of
back plate of the chuck, different methods of fastening the
chuck are employed as follows.
1. Screwing the chuck directly to the lathe spindle nose.
2. Aligning the chuck taper with the spindle nose taper and
fastening with a screw type flange.

3. Aligning the taper or both the chuck and the spindle
Slide and place the chuck on the wooden block. (Fig 13)
nose and fastening with nuts/ bolts or with cams.

72 Producltion & Manufacturing : Turner - Exercise 1.3.24