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**QUESTION FOUR**

a) List any two classifications of lathe machines.
(2 marks)

b) With the aid of sketches, explain the following accessories on a lathe machine:

i) Steady rest

ii) Follower rest
(2 marks)

iii) Gang mandrel
(2 marks)

c)

i) With the aid of a well-labeled diagram, explain the functions of any three main principal parts of a lathe machine.
(7 marks)

ii) Give any two methods of taper turning used to cut an angle of taper on a blank using a lathe machine.
(2 marks)

Answer :

Final answer:

Lathe machines can be classified into Engine and Turret types. Accessories like steady rests, follower rests, and gang mandrels support machining precision. Main parts include the bed, headstock, and tailstock, with taper turning achieved through methods like the compound rest and tailstock offset.


Explanation:

Classifications of Lathe Machines

  1. Engine Lathe
  2. Turret Lathe

Lathe Machine Accessories

Steady Rest

A steady rest is an accessory that supports the workpiece while it rotates. It prevents the workpiece from deflecting during machining operations.

Follower Rest

The follower rest provides support to the workpiece and moves along with it as it is machined. This reduces the chance of flexing and allows for more precise cuts.

Gang Mandrel

The gang mandrel is used to hold multiple tools or workpieces at the same time, increasing efficiency in production tasks.

Main Principal Parts of a Lathe Machine

Here are three principal parts:

  1. Bed: This is the main support structure of the lathe. It provides rigidity and alignment for other parts.
  2. Headstock: It houses the spindle and is responsible for holding and rotating the workpiece.
  3. Tailstock: It provides additional support for the workpiece and can accommodate tools for drilling or boring.

Taper Turning Methods

  1. Compound Rest: The compound rest is angled to gradually shift the tool position as the work rotates, allowing for a tapered cut.
  2. Tailstock Offset: This involves moving the tailstock slightly off-center to create a taper as the workpiece is turned.

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