LATHE OPERATIONS PPT POLAYYA CHINTADA

LATHE OPERATIONS PPT POLAYYA CHINTADA

1. LENDI INSTITUTE OF ENGINEERING AND TECHNOLOGY METAL CUTTING AND MACHINE TOOLS COURSE CODE: C302 REGULATION: R16 3 rd BTECH 1 st SEM PREPARED BY : POLAYYA CHINTADA M.TECH,M.B.A,(PhD) ASSISTANT PROFESSOR TOPIC : LATHE OPERATIONS

2. METAL CUTTING AND MACHINE TOOLS SYLLABUS UNIT 2: Engine lathe – principle of working, specification of lathe – types of lathe – work holders tool holders – box tools taper turning, thread turning – for lathes and attachments, constructional features of speed gear box and feed gear box. Turret and capstan lathes – collet chucks – other work holders – tool holding devices – box and tool layout. Principal features of automatic lathes – classification – single spindle and multi-spindle automatic lathe – tool layout and cam design for automats . s make the students understand Types of lathes, Lathe operations, Work holders, Tool holders, Lathe attachments& Automatic Lathes COURSE OBJECTIVE: COURSE OUTCOME: Understand the Lathe operations Using Lathe Machine, APPLICATIONS: Learned how to Use Lathe Tools and Importance of Lathe Machines.

3. LATHE OPERATIONS: Facing: Usually the first process performed. Facing is the process of making flat surfaces on a lathe. It is the machining of the ends of a work piece to make the ends smooth. The job is held on a faceplate or chuck and the tool is fed at right angles to the bed to obtain flat surfaces.

4. LATHE OPERATIONS: Plain Turning : Turning is the removal of metal from the outer diameter of a rotating cylindrical work piece. In plain turning, the work piece is turned straight throughout the entire length when it is made to rotate about the lathe axis, and the cutting tool is fed along the lathe axis. The plain or straight turning produces a cylindrical surface after machining.

5. LATHE OPERATIONS: Knurling: Knurling mainly used for gripping purpose, Decorative and/or Functional Purpose In this operation Knurling Tool is used It is a Forming Process Knurling, as shown in Figure may be of two types : (a) Straight or parallel, and (b) Diamond type.

6. LATHE OPERATIONS: Parting off: This operation involves cutting the work-metal into two parts by using parting off tool. Feed to the cutting tool is given in same manner as in case of facing operation

7. LATHE OPERATIONS: Drilling: For making a standard size of hole in a work piece by means of drill is known as drilling Operation. For this operation, drill is held in tail stock spindle.

8. LATHE OPERATIONS: boring: Boring is the operation of enlarging a drilled hole by means of a boring tool. The boring Tool is fitted on a boring bar which is held in tail stock spindle. . Boring

9. LATHE OPERATIONS: Thread cutting: Boring

10. LATHE OPERATIONS: Taper turning : When the diameter of a piece changes uniformly from one end to the other, the piece is said to be  tapered . Taper turning  as a machining operation is the gradual reduction in diameter from one part of a cylindrical work piece to another part Tapers  can be either external or internal. Taper turning methods: Taper turning operations are obtained in following methods: Taper turning by offsetting the tail stock Taper turning by swiveling the compound slide Taper turning by form tool method Taper turning with taper turning attachment

11. LATHE OPERATIONS: Taper turning by offsetting the tail stock

12. LATHE OPERATIONS: Taper turning by swiveling the compound slide

13. LATHE OPERATIONS: Taper turning with taper turning attachment

14. LATHE OPERATIONS: Taper turning by form tool method This is one of the simplest methods to produce short taper. This method is shown in the above figure. To the required angle the form is grounded. The tool is fed perpendicular to the lathe axis, when the work piece rotates. The tool cutting edge length must be greater than the taper length. Since the entire cutting edge removes the metal, it will produce a lot of vibration and hence a large force is required. It is done in slow speed.

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19. Y ours : POLAYYA CHINTADA M.TECH,M.B.A,(PhD) ASSISTANT PROFESSOR