1. THE LATHE

6. IF YOU DON'T KNOW HOW TO DO SOMETHING, ASK! BEFORE YOU START THE MACHINE: Study the machine. Know which parts move, which are stationary, and which are sharp. Double check that your work piece is securely held. Remove chuck keys after use. Machining Safety

7. DO NOT LEAVE MACHINES RUNNING UNATTENDED! CLEAN UP MACHINES AFTER YOU USE THEM! A dirty machine is unsafe and uncomfortable to work on. Do not use compressed air to blow machines clean. This endangers people's eyes and can force dirt into machine bearings. Machining Safety

8. Some guarding is interlocked and the lathe will not start unless the guard is in the correct protective position DO NOT LEAN ON THE GUARD WHILST USING THE LATHE

9. Watchmaker’s lathe Typical Lathe Turret Lathe Large Lathe

10. Large Industrial Lathes

11. How do you size a lathe for a particular job ?

13. CNC Lathe

16. Other materials such as Nylon can also be machined on a lathe

17. If there is a need to reduce the diameter of a long piece of material a centre lathe is ideal for this type of work. Usually one end of the material is held firmly in the chuck and the other is supported by the tailstock centre.

18. Common Machining Operations

21. Parting off

22. Common Machining Operations

30. Tools and tool holding on the centre lathe A SELECTION OF LATHE CUTTING TOOL PROFILESA SELECTION OF LATHE CUTTING TOOL PROFILES

31. Tool posts Conventional with packing on the left and adjustable on the right

32. Standard knife edge turning tool

33. Before any turning takes place it is common practice to check that the point of the lathe tool is centred. This means that the lathe tool point should be the same height as the tip of the tailstock centre.

35. Discontinuous chips

37. Temperature of Cutting Tip

38. Disposable tip cutter geometry

39. Tool shape relevant to strength

40. Coated Carbide Cutting

41. Carbide replaceable tip parting off tool

42. Layers are 2-10 microns thick: Ti N: titanium nitride (low friction, gold appearance) Ti CN: titanium carbonitride (wear resistance) Al 2 O 3 : Alumina (chemical stability, wear resistance) Tungsten Carbide substrate (~shock and wear resistance) Coated Carbide Cutting Inserts: The norm for production machining

44. Typical tool wear under an electron microscope