Turning Machines Lathe, Special Machines

Turning machines

1. MANUFACTURING TECHNOLOGY me3493

2. Course Outline MANUFACTURING TECHNOLOGY 2

3. SECOND Lesson We will cover these Knowledge: Turning Machine Construction and Working Principle Turning Operations Machining Time calculation Special machines MANUFACTURING TECHNOLOGY 3

4. MANUFACTURING TECHNOLOGY 4 Second LESSON SUMMARY Understand the Turning machine Principle and Operations. Calculate the machining time and power consumption. Describe about Lathe and Special lathe. Describe about Attachment, Tool Layout.

5. 5 MANUFACTURING TECHNOLOGY Course PROGRESS

6. 6 MANUFACTURING TECHNOLOGY Turning Operation Turning is the most common lathe machining operation. During the turning process, a cutting tool removes material from the outer diameter of a rotating work piece . The main objective of turning is to reduce the work piece diameter to the desired dimension. There are two types of turning operations, rough and finish .

7. 7 MANUFACTURING TECHNOLOGY Turning Machines In the turning process, the tool normally moves with the main axis (z) while the work piece rotates. When configured with a diameter less than the actual diameter of the work piece , it cuts off the work piece’s “surface” and reduces its diameter.

8. 8 MANUFACTURING TECHNOLOGY lathe “Father of machine Tool”. A lathe is  a machine tool that create an object with symmetry about that axis . It was invented by   DAVID WILKINSON ( 05 Jan. 1771 – 03 Feb. 1852 ).

9. 9 MANUFACTURING TECHNOLOGY Working principle It operates on the principle of a rotating work piece and a fixed cutting tool. The cutting tool is feed into the work piece which rotates about its own axis causing the work piece to form the desired shape.

10. 10 MANUFACTURING TECHNOLOGY Lathe specification

11. 11 MANUFACTURING TECHNOLOGY Parts of lathe

12. 12 MANUFACTURING TECHNOLOGY Parts of lathe

13. 13 MANUFACTURING TECHNOLOGY Lathe bed The Bed forms the base of a machine. It is mounted on the legs of the lathe machine, which are bolted to the floor. It is made up of cast iron and its top surface is machined accurately and precisely.

14. 14 MANUFACTURING TECHNOLOGY Head stock Head stock is an important part of a lathe machine, which is mounted permanently on the inner guide – ways at the left hand side of the bed. It consists of a main spindle, a chuck fitted at spindle nose, back gear drive and all gear drive .

15. 15 MANUFACTURING TECHNOLOGY Main spindle A main spindle is a hollow cylindrical shaft. It’s face has a standard  moarse  taper. It is used for holding the live Centre or collet. The spindle rotates on two large bearings housed on the head stock casting. The front end of the spindle is threaded, those are used for holding the chuck, face plate, driving plate and catch plate. It is know as a spindle nose.

16. 16 MANUFACTURING TECHNOLOGY Tail stock A tail stock is located on the inner guide – ways at the right side of the bed opposite to the head stock. The body of the tail stock is bored and house the tail stock spindle. The spindle moves front and back inside the hole. It has a taper hole to receive the dead Centre or shunk of tools such as drill or reamer. It’s body made up of cast iron.

17. 17 MANUFACTURING TECHNOLOGY Lead screw It is used to transmit power to carriage through gear and clutch arrangement in the carriage apron.

18. 18 MANUFACTURING TECHNOLOGY Live center A Live Center is mounting on bearings and rotates with the work. Live centers are using to hold or support a work-piece .

19. 19 MANUFACTURING TECHNOLOGY dead center A dead center may be use to support the work piece at either the fixed or rotating end of the machine. Dead centers are typically fully harden to prevent damage to the important mating surfaces of the taper and to preserve the 60° angle of the nose .

20. 20 MANUFACTURING TECHNOLOGY carriage A carriage is located between the head stock and tail stock on the lathe bed guide – ways. It can be moved along the bed either towards or away from the head stock. It has several parts to support, move and control the cutting tool.

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24. 24 MANUFACTURING TECHNOLOGY Types

25. 25 MANUFACTURING TECHNOLOGY Turning operations

26. 26 MANUFACTURING TECHNOLOGY Drilling & facing

27. 27 MANUFACTURING TECHNOLOGY turning

28. 28 MANUFACTURING TECHNOLOGY Rough & finish and taper turning

29. 29 MANUFACTURING TECHNOLOGY TAPER TURING when cuttings the taper, the tool will move at an angle relative to the work piece’s axis, resulting in the taper.

30. 30 MANUFACTURING TECHNOLOGY TAPER TURING METHODS Form tool method Tail stock method Compound rest method Taper turning attachment method

31. 31 MANUFACTURING TECHNOLOGY Form tool method This method is used for mass production for producing small length of taper. Form tool should be set right to the axis of the work. Carriage should be locked while turning taper.

32. 32 MANUFACTURING TECHNOLOGY Tail stock method

33. 33 MANUFACTURING TECHNOLOGY Compound Rest method