Screw thread :yks

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  • LEAD SCREW
  • Screw thread :yks

    1. 1. SCREW THREADS INTRODUCTION DEFINITION AND MAIN ELEMENTS OF THREAD USES OF THREADS CLASSIFICATION OF THREADS
    2. 2. SCREW THREADS
    3. 3. SCREW THREADSINTRODUCTION  PLAY AN IMPORTANT ROLE IN ENGINEERING INDUSTRY  EASIEST FASTENERS
    4. 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. 5. SCREW THREADSELEMENTS  MAJOR DIAMETER  MINOR DIAMETER  PITCH DIAMETER  PITCH
    6. 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. 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. 8. SCREW THREADSELEMENTS  ROOT  CREST  FLANK  THREAD ANGLE
    9. 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. 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. 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. 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. 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. 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. 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. 16. ELEMENTS OF SCREW THREADS PITCH DISTANCE BETWEEN CORRESPONDING POINTS OF TWO ADJACENT THREADS MEASURED PARALLEL TO AXIS PITCH = 1 / TPI
    17. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 27. SCREW THREADSCLASSIFICATION  ACCORDING TO POSITION  SHAPE AND WORK  DIRECTION  NUMBER OF STARTS
    28. 28. SCREW THREADSACCORDING TO POSITION  EXTERNAL THREADS  INTERNAL THREADS
    29. 29. SCREW THREADSEXTERNAL AND INTERNAL THREAD CUTTING
    30. 30. SCREW THREADSACCORDING TO SHAPE & WORK  V – THREADS  SQUARE THREADS  ACME THREADS  BUTTRESS THREADS  WORM THREADS
    31. 31. V-THREADS
    32. 32. SQUARE THREADS FOLLOWING LEADING ANGLE ANGLE
    33. 33. WORM THREADS
    34. 34. SCREW THREADSWORM AND WORM GEAR
    35. 35. ACME THREADS 29 DEG PITCH PITCHDEPTH SQUARE THREADS
    36. 36. BUTTRESS THREADS PITCHCREST
    37. 37. SCREW THREADSACCORDING TO DIRECTION RIGHT HAND THREADS LEFT HAND THREADS
    38. 38. SCREW THREADSACCORDING TO NUMBER OF STARTS SINGLE START THREADS MULTI START THREADS
    39. 39. SQUARE THREADS FOLLOWING LEADING ANGLE ANGLE
    40. 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. 41. SCREW THREADSSQUARE THREADS TaperFOUR JAW CHUCKTHREE JAW CHUCK
    42. 42. SCREW THREADSSQUARE THREADS ADJUSTABLE BED PRESS Ram Frame Screw Thread Base
    43. 43. ACME THREADS 29 DEG PITCH PITCHDEPTH SQUARE THREADS
    44. 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. 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. 46. SCREW THREADS LATHE MACHINE LEAD SCREW le
    47. 47. BUTTRESS THREADS PITCHCREST
    48. 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. 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. 50. SCREW THREADSCOUPLING RODS OF RAILWAY ROLLING STOCK
    51. 51. SCREW THREADS
    52. 52. SCREW THREADS
    53. 53. SCREW THREADS
    54. 54. SCREW THREADS
    55. 55. SCREW THREADS
    56. 56. SCREW THREADS
    57. 57. SCREW THREADS
    58. 58. SCREW THREADS

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