Ys
Welcome
Ys
u
YsTYPES OF
screw THREAD &
THEIR ELEMENTS
Ys INTRODUCTION
DEFINITION AND MAIN
ELEMENTS OF THREAD
USES OF THREADS
CLASSIFICATION OF
THREADS
SCREW THREADS
YsSCREW THREADS
YsINTRODUCTION
PLAY AN IMPORTANT ROLE IN
ENGINEERING INDUSTRY
EASIEST FASTENERS
SCREW THREADS
YsDEFINITION
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
SCREW THREADS
Ys ELEMENTS
MAJOR DIAMETER
MINOR DIAMETER
PITCH DIAMETER
PITCH
SCREW THREADS
YsPITCH ROOT CREST
DEPTH
MINOR DIA
PITCH DIA
MAJOR
DIA
THREAD ANGLE
SCREW THREADS
YsSCREW THREADS
Angle CrestFlank Pitch Point
Root Thread Depth Pitch Base of Thread
ELEMENTS OF THREAD
MINOR DIA
PITCH DIA
MAJOR
DIA
Center Axis Depth
Ys ROOT
CREST
FLANK
THREAD ANGLE
ELEMENTS
SCREW THREADS
YsPITCH ROOT CREST
DEPTH
MINOR DIA
PITCH DIA
MAJOR
DIA
THREAD ANGLE
SCREW THREADS
YsELEMENTS OF SCREW THREADS
MAJOR DIAMETER
CREST OR OUTSIDE DIAMETER OF
EXTERNAL THREAD
ROOT DIAMETER OF INTERNAL
THREAD
MAJOR DIAMETER = CORE
DIAMETER + (2 X DEPTH OF THREAD)
YsPITCH ROOT CREST
DEPTH
MINOR DIA
PITCH DIA
MAJOR
DIA
THREAD ANGLE
SCREW THREADS
YsELEMENTS OF SCREW THREADS
MINOR DIAMETER
CORE OR ROOT DIAMETER OF
EXTERNAL THREAD
CREST DIAMETER OF INTERNAL
THREAD
MINOR DIAMETER =
MAJOR DIAMETER – 2 DEPTH
YsSCREW THREADS
Angle CrestFlank Pitch Point
Root Thread Depth Pitch Base of Thread
ELEMENTS OF THREAD
MINOR DIA
PITCH DIA
MAJOR
DIA
Center Axis Depth
YsELEMENTS OF SCREW THREADS
PITCH DIAMETER
DIAMETER OF CENTERS OF TWO
OPPOSITE THREADS
ASSUMED DIAMETER
PASSES THROUGH CENTRE OF
THREADS
PD = MAJOR DIAMETER – DEPTH
YsSCREW THREADS
Angle CrestFlank Pitch Point
Root Thread Depth Pitch Base of Thread
ELEMENTS OF THREAD
MINOR DIA
PITCH DIA
MAJOR
DIA
Center Axis Depth
YsELEMENTS OF SCREW THREADS
PITCH
DISTANCE BETWEEN CORRESPONDING
POINTS OF TWO ADJACENT THREADS
MEASURED PARALLEL TO AXIS
PITCH = 1 / TPI
YsPITCH ROOT CREST
DEPTH
MINOR DIA
PITCH DIA
MAJOR
DIA
THREAD ANGLE
SCREW THREADS
YsELEMENTS 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
YsPITCH ROOT CREST
DEPTH
MINOR DIA
PITCH DIA
MAJOR
DIA
THREAD ANGLE
SCREW THREADS
YsELEMENTS 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
YsPITCH ROOT CREST
DEPTH
MINOR DIA
PITCH DIA
MAJOR
DIA
THREAD ANGLE
SCREW THREADS
Ys 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
SCREW THREADS
YsPITCH ROOT CREST
DEPTH
MINOR DIA
PITCH DIA
MAJOR
DIA
THREAD ANGLE
SCREW THREADS
Ys 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
SCREW THREADS
YsPITCH ROOT CREST
DEPTH
MINOR DIA
PITCH DIA
MAJOR
DIA
THREAD ANGLE
SCREW THREADS
Ys 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.
SCREW THREADS
Ys CLASSIFICATION
ACCORDING TO POSITION
SHAPE AND WORK
DIRECTION
NUMBER OF STARTS
SCREW THREADS
YsACCORDING TO POSITION
EXTERNAL THREADS
INTERNAL THREADS
SCREW THREADS
YsSCREW THREADS
EXTERNAL AND INTERNAL THREAD CUTTING
Ys ACCORDING TO SHAPE & WORK
V – THREADS
SQUARE THREADS
ACME THREADS
BUTTRESS THREADS
WORM THREADS
SCREW THREADS
YsV-THREADS
YsSQUARE THREADS
FOLLOWING ANGLE
LEADING ANGLE
YsWORM THREADS
YsSCREW THREADS
WORM AND WORM GEAR
YsACME THREADS
PITCH29 DEG
DEPTH
PITCH
SQUARE THREADS
YsBUTTRESS THREADS
CREST
PITCH
Ys ACCORDING TO DIRECTION
RIGHT HAND THREADS
LEFT HAND THREADS
SCREW THREADS
Ys ACCORDING TO NUMBER OF STARTS
SINGLE START THREADS
MULTI START THREADS
SCREW THREADS
YsSQUARE THREADS
FOLLOWING ANGLE
LEADING ANGLE
Ys 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
SQUARE THREADS
YsSCREW THREADS
Taper
SQUARE THREADS
FOUR JAW CHUCK
THREE JAW CHUCK
YsSCREW THREADS
Frame
Ram
Base
Screw Thread
ADJUSTABLE BED PRESS
SQUARE THREADS
YsACME THREADS
PITCH29 DEG
DEPTH
PITCH
SQUARE THREADS
Ys ANGLE = 290
DEPTH = 0.5 X P + 0.01 INCH
FLAT AT BOTTOM =.3707X P-.0052
FLAT AT TOP =.3707X P
ACME THREADS
Ys 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
ACME THREADS
YsSCREW THREADS
LATHE MACHINE
leLEAD SCREW
YsBUTTRESS THREADS
CREST
PITCH
Ys TOOTH SHAPE TRIANGULAR
450 AT ONE SIDE & 900 AT ANOTHER
SIDE
DEPTH = 0.75 X P
WIDTH AT CREST & ROOT = 0.125 X P
BUTTRESS THREADS
Ys 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
KNUCKLE THREADS
YsSCREW THREADS
COUPLING RODS OF RAILWAY ROLLING STOCK
Ys
CONCLUSION
YsAny
Question please?
YsSCREW THREADS
THANK YOU
YsSCREW THREADS
YsSCREW THREADS
YsSCREW THREADS
YsSCREW THREADS
YsSCREW THREADS
YsSCREW THREADS
YsSCREW THREADS
Ys