The document describes various components and their functions in a lathe, including centers, chucks, driving plates, and angle plates. It explains the types of centers (live and dead), chucks (three jaw and four jaw), and the use of different tools for holding and rotating workpieces. Additionally, it discusses the importance of using these components to prevent deflection and support longer jobs during machining.

2. • Used for holding the work piece
in lathe.
• The entire load of the work
piece and thrust developed due
to metal cutting is taken by the
centers
• Made up of very hard metals to
resist deflection and wear .
• Included angle is generally
between 60 - 75°.
• Its different types are live and
dead center.

3. • Used for holding and
rotating a work piece in
lathe.
• Components of any regular
of irregular can be held.
• Attached to the spindle with
bolts with the back plate
screwed on spindle nose.
• Mainly two types : universal
or three jaw chuck and four
jaw chuck (independent) .

4. • They are used in
conjunction with the driving
plate.
• It may be straight tailed or
bent tailed.
• The work piece to be held is
inserted in the V shaped
hole.
• Work piece of larger
diameter can’t be held.

5. • Used for holding the chuck
in lathe.
• It is very heavy and has
strong ribs.
• Nuts and bolts are used for
clamping the chuck with it.
• Has thread in a hole in
centre so that it can be fit
into the spindle nose.

6. • Also known as driving plate.
• For attachment to the end of
head stock driving spindle,
the hole in center in
internally threaded.
• It also carries a hole for the
pin which engages with the
tail of the lathe carrier when
the work piece is held.

7. • It is a L shaped plate with two
faces machined at right angles
on has slots for clamping on
face plate.
• When work piece is such that
it is not possible to clamp it to
the chuck then angle plate is
used.

8. • It is a shaft made of high
carbon steel and mounted
between the centres.
• It is used for holding the pre
drilled work pieces for
outside machining.
• It is always rotated with the
help of a dog and it is never
placed in a chuck.
• Its various types are plain,
step, collar, screw, cone,
gang, expansion.

9. • It is used to support a long
slender job, which is turned
between centres.
• It prevents the bending of work
piece which is cause due to its
own weight and vibrations of
the cutting forces.
• It is generally used when length
to diameter ratio is around 1 :
10-12.
• Mainly of two types : steady
and follower.