Lathe machine

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Lathe machine

  1. 1. PRESENTATION ON LATHE MACHINE
  2. 2. PRINCIPLE OF LATHE  Lathe is a machine, which is used to remove metal from the workpiece to required shape and size.
  3. 3. COMPONENTS OF LATHE
  4. 4. TYPES OF LATHES •Speed Lathe : It is the simplest type lathe. It is mainly used for metal spinning, polishing etc. •Bench Lathe : It is small sized engine lathe mounted on bench. It is used for turning small and light weight workpiece. •Tool Room Lathe : It is used for production of small tools, gauges, fixtures and accurate parts in tool room.
  5. 5. •Turret Lathe : These lathes are used in mass production and for heavy duty workpieces. •Capsten Lathe : These lathes are used in mass production used for light duty workpieces. •Special Purpose Lathe : These lathes are modification of engine lathes developed for machining special types of workpices.
  6. 6. •Automatic Lathe •Engine Lathe •Tracer Lathe •Computer Controlled lathe •Swiss Type Automatic Lathe •Duplicating Lathe
  7. 7. COMPUTER NUMERICALLY CONTROLLED LATHE  Computer Numerical Controls (CNC)  Equipped with one or more turrets  Each turret is equipped with a variety of tools  Performs several operations on different surfaces of the workpiece
  8. 8. TURRET LATHE Capable of performing multiple cutting operations on the same workpiece  Turning  Boring  Drilling  Thread cutting  Facing Turret lathes are very versatile Types of turret lathes  Ram-type: ram slides in a separate base on the saddle  Saddle type:  more heavily constructed  Used to machine large workpeiceces
  9. 9. ENGINE LATHE
  10. 10. BENCH LATHE AUTOMATIC LATHE
  11. 11. PARTS OF LATHE •Bed : Supports all major components •Carriage: Slides along the ways and consists of the cross-slide, tool post, apron •Headstock : Holds the jaws for the work piece, supplies power to the jaws and has various drive speeds •Tailstock : Supports the other end of the workpiece •Feed Rod and Lead Screw : Feed rod is powered by a set of gears from the headstock
  12. 12. LATHE BED •Heavy, rugged casting •Made to support working parts of lathe •On top section are machined ways •Guide and align major parts of lathe
  13. 13. HEADSTOCK  Clamped on left-hand end of bed  Headstock spindle  Hollow cylindrical shaft supported by bearings  Provides drive through gears to work-holding devices
  14. 14. CARRIAGE  Used to move cutting tool along lathe bed  Consists of three main parts  Saddle  Cross-slide  Apron
  15. 15. APRON
  16. 16. 16 TAILSTOCK
  17. 17. ACCESSORIES  Chucks :  Three jaw chuck  Four jaw chuck  Collet chuck  Centres:  Live centre  Dead centre  Tipped centre  Ball centre  Mandrels :  Plain mandrel  Stepped mandrel  Collared mandrel  Screwed mandrel
  18. 18.  Chucks : • Three Jaw Chuck (Self Centering Chuck) : This chuck is used to hold circular workpiece and is available in sizes from 100mm to 600 mm.  Four Jaw Chuck (Independent Chuck) : It is used to hold rectangular, sqare and irregular shaped workpieces . ACCESSORIES
  19. 19.  Collet Chuck :  Pull poerating rod  Push poerating rod It is ideal for holding tube and thin walled workpieces.
  20. 20.  Centres:  Live Centre  Dead Centre  Ball Centre  Pipe Centre  Half Centre  Tipped Centre
  21. 21.  Mandrels :  Plain Mandrel  Collared Mandrel  Screwed Mnadrel  Stepped Mandrel
  22. 22. LATHE OPERATIONS
  23. 23. •Turing •Facing •Boring •Drilling •Taper •Camfering •Grooving •Forming •Reaming •Undercutting •Thread cutting •Knurling LATHE OPERATIONS
  24. 24. BORING  Boring produces circular internal profiles in hollow workpieces  Boring mills are used for large workpieces  Holes can be bored up to 20M if needed  See fig. 22.20  Machines are available with a variety of features  Horizontal boring machines  Jig borers
  25. 25. TURNING  Forces in turning  Cutting force: acts downward on the tool tip  Thrust force: acts in the longitudinal direction  Radial force: acts in the radial direction  Roughing and Finishing Cuts  Rough cut: high speed cut with little regard for dimensional tolerance  Finishing cut: lower feed rate and depth of cut  Tool Materials, Feeds, and Cutting Speeds  Cutting Fluids
  26. 26. CONCEPT OF SPEED, FEED AND DEPTH OF CUT •Cutting speed=Πdn mm/min 1000 •Feed : •It is expressed in mm/rev •Depth of cut : t=D-d mm 2
  27. 27. SINGLE POINT CUTTING TOOL GEOMETRY •Clearance •Rake •End cutting edge angle •Side cutting edge angle

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