What are the Parts of a Lathe Machine ?

It is mainly used for machining circular surfaces such as cylindrical or conical but it can also be used for making flat surfaces, drilling holes, machining slots, and many other types of work. But nowadays CNC machining lathe is most widely used in the industry because this type of lathe is fully automatic

Parts of Lathe Machine.

There are following parts are used in the lathe machine:

• Bed
• Guideways
• Headstock
• Spindle
• Carriage
• Saddle
• Cross slide
• Compound Rest
• Compound slide
• Tool Post
• Apron
• Tailstock
• Chuck
• Face Plate
• Center
• Feed Shaft
• Lead Screw
• Legs
• Chips Pan
• Hand Wheel
• Speed Controller
• Bull Gear
• Sleeve

1. Bed

A bed is the main body of the machine.

All the main components are bolted on it.

It is usually made of cast iron due to its high compressive strength.

It is made by the casting process and is bolted to the floor space.

All the main components are bolted on it.

It is usually made of cast iron due to its high compressive strength.

It is made by the casting process and is bolted to the floor space.

2. Guideways

Guideways take care of the movement of tailstock and carriage on the bed

3. Headstock

Headstocks are the main body parts that are placed on the left side of the bed.

It serves as a holding device for gear chains, spindles, driving pulleys, etc.

The mechanism of the headstock is driven by an electric motor that rotates the spindle.

It is also made of cast iron

4. Spindle

It is the main part of the lathe which holds and rotates the chuck.

It is made from good quality alloy steel and it is heat treated.

Threads, tapers, etc. are made at one end of the spindle to which holding devices can be attached.

5. Carriage
   It is located between headstock and tailstock.

It is used to hold and move the tool post along the bed either towards or away from the headstock.

It slides on the guideways.

It is also made of cast iron.

It has six main parts:
Saddle
Cross slide
Compound Rest
Compound slide
Tool Post
Apron

6.Saddle
It is an ‘H’ shaped casting mounted on lathe ways, supports the cross slide that provides movement to the tool post.

7. Cross Slide
   A cross slide is a part of the carriage that allows the movement of a tool post at a right angle to the bed guideways during machining.

The cross slide is moved by the feed screw.

8. Compound Rest
   A compound rest is a part that connects the cross slide and the compound slide.

The compound rest is mounted on top of the cross
Compound Slide
A compound slide is attached to the compound rest by the dovetail joint.

9. Compound slides are used to cut angles or tapers that cannot be cut by rotating the headstock.

10 . Tool Post
It is bolted to the carriage on top of the compound slide.

It is used to hold the tools at the correct position with rigidity.
11. Apron
An apron is situated on the carriage.

It consists of all controlling and moving mechanisms of carriage.

The apron is fastened to the saddle with feed mechanisms that provide automatic feed to the carriage.
The apron hand wheel can be rotated to move the carriage by hand along with the bed of the lathe.
12. Tailstock
Tailstock is a casting located on the right side of the bed.

Its function is to support the loose end of the workpiece or a job while machining.

It can slide on the bed guideways and can be clamped in any position.

The tailstock has the following purposes:
To support the loose ends of long jobs for carrying out lathe operations.
To hold the cutting tools such as drill chucks, drills, reamers, etc.
Turning of outer taper by an offsetting method

13. Chuck
It is an important tool, which is used to hold and rotate the workpiece.

The smallest piece of workpiece can be hold in a chuck.

14. Faceplate
    The faceplate is fixed to the lathe spindle and can be job mounted to perform the turning operation.
15. Center
    Center is a part of lathe machine which is used to support long jobs in between headstock and tailstock to carry out a lathe operation.

A center that fits into the headstock spindle and rotates with the workpiece is called a live center.

16 . Feed Shaft
It is made from good quality alloy steel.

It spans the entire length of the bed and is fitted under the lead screw.

It has a “keyway” from which motions can be given to the carriage for the feed mechanism.

When the power feed is attached, it provides cross movement to the tool.

17. Lead Screw
    It is used for thread cutting.
    Lead screw is situated at the bottom side of the bed which is used to move the carriage automatically during thread cutting.
    It is made from good quality alloy and is made of acme threads.

17. Legs
    Legs are used to carry all the loads of the machine.
    They are bolted on the floor which prevents vibration.

19. Chips Pan
    Chips pan is placed lower side of the bed.
    The main function of it is to carry all chips removed by the workpiece.

20 .Hand Wheel
This is the wheel that is operated by hand to move a cross slide, carriage, tailstock, and other parts that contain a hand wheel.
Speed ​​Controller
The speed controller is located on the headstock which controls the speed of the spindle.

21. Bull Gear
    It is made from cast iron.
    It is used for slow and fast speeds by means of a bull gear back pin and is fixed by a ‘key’ on the hollow spindle

21. Sleeve
    Sleeve fits inside tailstock which can be moved back and forth to fit or remove dead center.
22. Specification of Lathe
    The size of the lathe is specified according to:
    Height of the centers.
    Swing
    Center distance
    Length of bed
    Maximum diameter of the bar
    Swing on carriage