LATHE
*Lathe machine is a basic machine which is used in every metal forming industries. It is combination of many parts which works together to perform a desire function. A lathe machine is used to machine cylindrical work piece which is 360 degree symmetrical form the axis of rotation.
*It used to perform turning, chamfering, boring, facing, internal threading, shaping, slot cutting etc. on cylindrical work piece.
*There are many types of lathe machine but each machine consist some basic part which are essential for its proper working. These parts are bed, tool post, Chuck, head stock, tail stock, legs, Gear chain, lead screw, carriage, cross slide, split nut, apron, chip pan, guide ways etc.
PARTS OF LATHE MACHINE
1. Bed
It is the main body of the machine. All main components are bolted on it. It is usually made by cast iron due to its high compressive strength and high lubrication quality. It is made by casting process and bolted on floor space.
2. Tool post
It is bolted on the carriage. It is used to hold the tool at correct position. Tool holder mounted on it.
3. Chuck
Chuck is used to hold the workspace. It is bolted on the spindle which rotates the chuck and work piece. It is four jaw and three jaw according to the requirement of machine.
4. Head stock
Head stock is the main body parts which are placed at left side of bed. It is serve as holding device for the gear chain, spindle, driving pulley etc. It is also made by cast iron.
5. Tail stock
Tail stock situated on bed. It is placed at right hand side of the bed. The main function of tail stock to support the job when required. It is also used to perform drilling operation.
6. Lead screw
Lead screw is situated at the bottom side of bed which is used to move the carriage automatically during thread cutting.
7. Legs
Legs are used to carry all the loads of the machine. They are bolted on the floor which prevents vibration.
8. Carriage
It is situated between the head stock and tail stock. It is used to hold and move the tool post on the bed vertically and horizontally. It slides on the guide ways. Carriage is made by cast iron.
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9. Apron
It is situated on the carriage. It consist all controlling and moving mechanism of carriage.
10. Chips pan
Chips pan is placed lower side of bed. The main function of it to carries all chips removed by the work piece.
11. Guide ways
Guide ways take care of movement of tail stock and carriage on bed.
12. Speed controller
Speed controller switch is situated on head stock which controls the speed of spindle.
13. Spindle
It is the main part of lathe which holds and rotates the chuck.
LATHE MACHINE OPERATION
Lathe machine is used to cut the metal from cylindrical work piece, and convert it into desire shape. It turns the cylindrical work piece, and during turning a sharp edge cutting tool introduce, which cuts the metal.
1. A cylindrical work piece fixed to the chuck. A chuck may have three jaw or for jaw according to the requirement. The work piece is at the center or some eccentric according to the process perform.
2. The spindle starts to rotate and set it at desire speed. The spindle speed plays a huge role during cutting. The spindle rotates the chuck and work piece.
3. Now check the work piece is turning properly. If it not set the work piece using dial gauge.
4. Now set the tool at desire feed by moving the tool post and carriage. The feed also play main role during cutting. Large feed may cause unwanted temperature increase.
5. After it tool is introduce between moving work piece at desire feed rate. It cut the metal from work piece. The feed rate is set at the cutting condition.
6. Now all unwanted metal is removed by moving the carriage form horizontally and vertically as desire according to the job requirement. After complete all process we got a well finished job.
7. Lathe can perform turning, boring, chamfering, shaping, facing, drilling knurling, grooving as shown in figure.