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INDUSTRIAL TRAINING INSTITUTE. PALANA, GUJARAT

INDUSTRIAL TRAINING INSTITUTE. PALANA, GUJARAT. CENTRE OF EXCELLANCE ( MECHANICAL SECTOR ). A SKILLED WORKER IS THE HEART OF INDUSTRY. MODULE : 4. BASIC TURNING AND GRINDING. DURATION 8 WEEKS. BASIC TURNING AND GRINDING. SPLIT-UP OF SYLLABUS (THEORY). TYPES OF SAFETY. General safety

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INDUSTRIAL TRAINING INSTITUTE. PALANA, GUJARAT

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  1. INDUSTRIAL TRAINING INSTITUTE.PALANA, GUJARAT

  2. CENTRE OF EXCELLANCE( MECHANICAL SECTOR )

  3. A SKILLED WORKER IS THE HEART OF INDUSTRY.

  4. MODULE : 4 BASIC TURNING AND GRINDING DURATION 8 WEEKS

  5. BASIC TURNING AND GRINDING

  6. SPLIT-UP OF SYLLABUS(THEORY)

  7. TYPES OF SAFETY • General safety • Personal safety • Machine safety

  8. PERSONAL SAFETY • Wear a one piece overall or boiler suit. • Keep the over all buttons fastened. • Don’t use ties and scarves. • Cut the hair short. • Don’t wear a ring,watch or chain.

  9. MACHINE SAFETY • Switch off the machine immediately if something goes wrong. • Keep the machine clean. • Stop the machine before changing the speed. • Check the oil level before starting the machine.

  10. LATHE M/C INTRODUCTION & SPECIFICATION • The length of bed. • The maximum diameter(swing)of the work that can be turned. • The length between centers and the pitch of the lead screw.

  11. TYPES OF LATHES • Speed lathes • engine lathes • Bench lathes • Tool room lathes • Capstan and turret lathes • Special purpose lathes • Automatic lathes

  12. PARTS OF LATHE M/C • Headstock • bed • Cross slide • Compound rest • Tail stock • Feed shaft • Carriage • Lead screw • Leg • Quick change gear box

  13. HEAD STOCK • All – Geared Headstock • Cone Pulley Drive Headstock

  14. CARRAIGE • Tool post • Cross – slide • Top slide • Saddle • Saddle lock • Compound rest • Apron

  15. BED • Vee slides • Heavily ribbed • Machined ways • Heavy construction fine grain cast iron

  16. TAIL STOCK • Base • Body • Spindle • spindle locking lever • Operating screw rod • Operating nut • Tailstock hand wheel • Key • Clamping unit

  17. FEED MECHANISM • Spindle gear • Tumbler gear unit • Fixed stud gear • Change gear unit • Quick change gearbox • Feed shaft/lead screw • Apron mechanism

  18. TOOL POST • American type tool post • Indexing type tool post • Quick change tool post

  19. THREE JAW CHUCK • Backplate • Body • Jaws • Crown wheel • Pinion

  20. SPECIFICATION OF A CHUCK • Type of chuck • Capacity of the chuck • Diameter of the body • Width of the body • Method of mounting to the spindle nose

  21. FOUR JAW CHUCK • Backplate • Body • Jaws • Square threaded screw shaft

  22. DIFFERENCE BETWEEN 3 & 4 JAW CHUCK • Setting up of work is easy • Has less gripping power • Depth of cut is comparatively less • Heavier jobs cannot be turned • Workpieces cannot be set for eccentric turning • Setting up of work is difficult • More gripping power • More depth of cut can be given • Heavier jobs can be turned • Workpieces can be set for eccentric turning

  23. TYPES OF LATHE CENTERS • Ordinary centre • Half centre • Tipped centre • Ball centre • Pipe centre • Revolving centre • Insert type centre • Self-driving centre • Female centre • Swivel `v` centre

  24. TYPE OF CARRIERS • Straight tail carrier • Bent carrier • Clamp type carrier

  25. DRIVING PLATE • Catch plates • Driving plates • Safety driving plates

  26. FACE PLATE • Face-plates with only elongated radial slots • Face-plates with elongated slots and `T`slots • Face-plates with elongated radial slots and additional parallel slots.

  27. STEADY REST • Fixed steady rest • Follower steady rest

  28. FIXED STEADY REST • Top portion • Lock screw top portion • Adjustable pads • Work • Hinge • Bearing pads locking screw • Base • Lathe bed clamp

  29. FOLLOWER STEADY REST • Locking screw • Bearing pads • Adjusting screws • Frame

  30. LATHE MACHINE OPERATION - FACING • This is an operation of removing metal from the work-face by feeding the tool at right angles to the axis of the work.

  31. PURPOSE OF FACING • To have a reference plane to mark and measure the step lengths of work. • To have a face at right angle to the axis of the work. • To remove the rough surface on the faces of the work and have finished faces instead. • To maintain the total length of the work.

  32. PLAIN TURNING • Rough turning, using roughing tool or knife tool. • Finish turning using a finishing tool.

  33. GROOVING • Grooving is the process of turning a grooved form or channel on a cylindrically turned work piece. The shape of the cutting tool and depth to which it is fed determine the shape of the groove.

  34. TYPE OF GROOVES • Square grooves • Round groove • `V`shaped groove

  35. CHAMFERING • To remove burrs and sharp edges from the turned components to make their handling safe. • To permit for easy assembly of mating components. • To provide better appearance.

  36. MATHOD OF CHEFERING • Form tool method • Filling method • Compound slide method

  37. TYPE OF KNURLING • Diamond knurling • Straight knurling • Cross knurling • Concave knurling • Convex knurling

  38. TYPES OF MANDRELS • Expansion mandrel • Gang mandrel • Stepped mandrel • Screw or threaded mandrel • Taper shank mandrel • Cone mandrel

  39. DRILLING AND BORING • Drilling is the operation of originating circular holes. The tool employed for this purpose is a drill. • Two different method are employed in a lathe for this operation. • Work is clamped in the headstock in a chuck or on the faceplate. The drill is held in the tailstock and fed.

  40. TAPER • A Taper is uniform increase or decrease in diameter along the length of a cylinder.

  41. TYPES OF TAPER • Self-holding tapers • Quick releasing tapers • Morse taper • Brown and sharpe taper • Jarno taper • Metric taper • Pin taper

  42. TAPER TURNING METHOD • Form tool method • Compound slide method • Tailstock offset method • Taper turning method • Taper turning attachment method

  43. SCREW THREAD • A screw thread is a ridge of uniform section formed helically on the surface of a cylindrical body. • An external screw thread is formed on the outer surface of a cylindrical part.

  44. USE OF SCREW THREAD • As fasteners to hold together and dismantle.components when needed • To transmit motion on machine from one unit to another • To make accurate measurements • To apply pressure

  45. PART OF SCREW THREAD • Crest • Root • Flank • Thread angle • Depth • Major diameter • Minor diameter • Pitch diameter • Lead • Helix angle

  46. FORM OF SCREW THREAD • Vee threads • Square threads • Trapezoidal threads

  47. CUTTING TOOLS CLASSIFICATION • Single point cutting tools • Multi point cutting tools • Form tools

  48. TYPES OF LATHE CUTIING TOOL • Solid type tools • Brazed type tools • Inserted bits with holders • Throw away type tools

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