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Screw thread :yks

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  • LEAD SCREW
  • Transcript

    • 1. SCREW THREADS INTRODUCTION DEFINITION AND MAIN ELEMENTS OF THREAD USES OF THREADS CLASSIFICATION OF THREADS
    • 2. SCREW THREADS
    • 3. SCREW THREADSINTRODUCTION  PLAY AN IMPORTANT ROLE IN ENGINEERING INDUSTRY  EASIEST FASTENERS
    • 4. SCREW THREADSDEFINITION A THREAD IS A HELICAL RIDGE OF UNIFORM SECTION THAT LIES ON INSIDE OR OUTSIDE OF A CYLINDER OR CONE CUTTING GROOVES OF EQUAL LENGTH AND EQUAL DEPTH ON EXTERNAL OR INTERNAL SURFACE OF A CYLINDRICAL OR CONE SHAPED JOB ARE CALLED THREAD CUTTING
    • 5. SCREW THREADSELEMENTS  MAJOR DIAMETER  MINOR DIAMETER  PITCH DIAMETER  PITCH
    • 6. SCREW THREADSPITCH ROOT CREST M P M I I ADEPTH N T J O C O R H R D D D I I I A A A THREAD ANGLE
    • 7. SCREW THREADSELEMENTS OF THREAD Angle Crest Flank Pitch Point M P M A I I J T N O C O R H R D D D I I I A A A Root Thread Depth Center Axis Depth Pitch Base of Thread
    • 8. SCREW THREADSELEMENTS  ROOT  CREST  FLANK  THREAD ANGLE
    • 9. SCREW THREADSPITCH ROOT CREST M P M I I ADEPTH N T J O C O R H R D D D I I I A A A THREAD ANGLE
    • 10. ELEMENTS OF SCREW THREADSMAJOR DIAMETER CREST OR OUTSIDE DIAMETER OF EXTERNAL THREAD ROOT DIAMETER OF INTERNAL THREAD MAJOR DIAMETER = CORE DIAMETER + (2 X DEPTH OF THREAD)
    • 11. SCREW THREADSPITCH ROOT CREST M P M I I ADEPTH N T J O C O R H R D D D I I I A A A THREAD ANGLE
    • 12. ELEMENTS OF SCREW THREADSMINOR DIAMETER CORE OR ROOT DIAMETER OF EXTERNAL THREAD CREST DIAMETER OF INTERNAL THREAD MINOR DIAMETER = MAJOR DIAMETER – 2 DEPTH
    • 13. SCREW THREADSELEMENTS OF THREAD Angle Crest Flank Pitch Point M P M A I I J T N O C O R H R D D D I I I A A A Root Thread Depth Center Axis Depth Pitch Base of Thread
    • 14. ELEMENTS OF SCREW THREADSPITCH DIAMETER DIAMETER OF CENTERS OF TWO OPPOSITE THREADS ASSUMED DIAMETER PASSES THROUGH CENTRE OF THREADS PD = MAJOR DIAMETER – DEPTH
    • 15. SCREW THREADSELEMENTS OF THREAD Angle Crest Flank Pitch Point M P M A I I J T N O C O R H R D D D I I I A A A Root Thread Depth Center Axis Depth Pitch Base of Thread
    • 16. ELEMENTS OF SCREW THREADS PITCH DISTANCE BETWEEN CORRESPONDING POINTS OF TWO ADJACENT THREADS MEASURED PARALLEL TO AXIS PITCH = 1 / TPI
    • 17. SCREW THREADSPITCH ROOT CREST M P M I I ADEPTH N T J O C O R H R D D D I I I A A A THREAD ANGLE
    • 18. ELEMENTS OF SCREW THREADS ROOT  BOTTOM PORTION OF THE THREAD WHERE BOTH SIDES MEET CREST  TOP PORTION OF THE THREAD WHERE BOTH SIDES MEET FLANK  STRAIGHT SIDES, WHICH CONNECT THE CREST WITH THE ROOT
    • 19. SCREW THREADSPITCH ROOT CREST M P M I I ADEPTH N T J O C O R H R D D D I I I A A A THREAD ANGLE
    • 20. ELEMENTS OF SCREW THREADS THREAD ANGLE  ANGLE AT WHICH BOTH SIDES OF THE THREAD MEET AXIS OF A SCREW  LONGITUDINAL CENTERLINE THROUGH A SCREW BASE OF THE THREAD  BOTTOM SECTION OF THE THREAD  GREATEST SECTION BETWEEN THE TWO ADJACENT ROOTS
    • 21. SCREW THREADSPITCH ROOT CREST M P M I I ADEPTH N T J O C O R H R D D D I I I A A A THREAD ANGLE
    • 22. SCREW THREADS DEPTH OF THREAD  DISTANCE FROM CREST TO ROOT MEASURED VERTICALLY LEAD  DISTANCE TRAVELED BY A NUT IN ONE COMPLETE REVOLUTION  SINGLE START THREADS : LEAD = PITCH  MULTI START THREADS : LEAD = PITCH X NUMBER OF STARTS
    • 23. SCREW THREADSPITCH ROOT CREST M P M I I ADEPTH N T J O C O R H R D D D I I I A A A THREAD ANGLE
    • 24. SCREW THREADS THREADS PER INCH  NUMBER OF THREADS IN ONE INCH LENGTH OF SCREW. IT IS ABBREVIATED AS TPI. THICKNESS OF THREADS  DISTANCE BETWEEN THE ADJACENT SIDES OF THE THREADS MEASURED ALONG THE PITCH LINE
    • 25. SCREW THREADSPITCH ROOT CREST M P M I I ADEPTH N T J O C O R H R D D D I I I A A A THREAD ANGLE
    • 26. SCREW THREADS DEPTH OF ENGAGEMENT  DEPTH OF THE THREAD CONTACT OF TWO MATING PARTS MEASURED RADIALLY LENGTH OF ENGAGEMENT  LENGTH OF CONTACT BETWEEN TWO MATING PARTS MEASURED AXIALLY.
    • 27. SCREW THREADSCLASSIFICATION  ACCORDING TO POSITION  SHAPE AND WORK  DIRECTION  NUMBER OF STARTS
    • 28. SCREW THREADSACCORDING TO POSITION  EXTERNAL THREADS  INTERNAL THREADS
    • 29. SCREW THREADSEXTERNAL AND INTERNAL THREAD CUTTING
    • 30. SCREW THREADSACCORDING TO SHAPE & WORK  V – THREADS  SQUARE THREADS  ACME THREADS  BUTTRESS THREADS  WORM THREADS
    • 31. V-THREADS
    • 32. SQUARE THREADS FOLLOWING LEADING ANGLE ANGLE
    • 33. WORM THREADS
    • 34. SCREW THREADSWORM AND WORM GEAR
    • 35. ACME THREADS 29 DEG PITCH PITCHDEPTH SQUARE THREADS
    • 36. BUTTRESS THREADS PITCHCREST
    • 37. SCREW THREADSACCORDING TO DIRECTION RIGHT HAND THREADS LEFT HAND THREADS
    • 38. SCREW THREADSACCORDING TO NUMBER OF STARTS SINGLE START THREADS MULTI START THREADS
    • 39. SQUARE THREADS FOLLOWING LEADING ANGLE ANGLE
    • 40. SQUARE THREADS  USED IN LIFTING WEIGHT, VICE SPINDLES, PRESS MACHINE SPINDLE, POWER TRANSMISSION AND SCREW JACK ETC  ANGLE = 90°  DEPTH = 0.5 X PITCH  CREST AND ROOT WIDTH = 0.5 X PITCH
    • 41. SCREW THREADSSQUARE THREADS TaperFOUR JAW CHUCKTHREE JAW CHUCK
    • 42. SCREW THREADSSQUARE THREADS ADJUSTABLE BED PRESS Ram Frame Screw Thread Base
    • 43. ACME THREADS 29 DEG PITCH PITCHDEPTH SQUARE THREADS
    • 44. ACME THREADS ANGLE = 290 DEPTH = 0.5 X P + 0.01 INCH FLAT AT BOTTOM =.3707X P-.0052 FLAT AT TOP =.3707X P
    • 45. ACME THREADS USED FOR POWER TRANSMISSION USED WHERE ENGAGEMENT WITH A HALF NUT IS REQUIRED AS IN LATHE ANGLE = 290 DEPTH = 0.5 X P + 0.001 INCH
    • 46. SCREW THREADS LATHE MACHINE LEAD SCREW le
    • 47. BUTTRESS THREADS PITCHCREST
    • 48. BUTTRESS THREADS TOOTH SHAPE TRIANGULAR 450 AT ONE SIDE & 900 AT ANOTHER SIDE DEPTH = 0.75 X P WIDTH AT CREST & ROOT = 0.125 X P
    • 49. KNUCKLE THREADS  ROUNDED SQUARE THREAD  SUITABLE FOR ROUGH AND HEAVY WORK  COUPLING RODS OF RAILWAY ROLLING STOCK  ANGLE = 900  DEPTH = 0.5 X P  RADIUS = 0.25 X P
    • 50. SCREW THREADSCOUPLING RODS OF RAILWAY ROLLING STOCK
    • 51. SCREW THREADS
    • 52. SCREW THREADS
    • 53. SCREW THREADS
    • 54. SCREW THREADS
    • 55. SCREW THREADS
    • 56. SCREW THREADS
    • 57. SCREW THREADS
    • 58. SCREW THREADS