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Development of Thread

This document discusses different types of threads used in manufacturing. It describes metric and British standard thread forms including dimensions and specifications. Various thread cutting and forming tools are also introduced such as taps, dies, lathes and milling machines used to create internal and external threads. Common thread types like metric, whitworth, buttress, pipe and multiple start threads are explained.

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Asiri Umayanga
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117 views28 pages

Development of Thread

This document discusses different types of threads used in manufacturing. It describes metric and British standard thread forms including dimensions and specifications. Various thread cutting and forming tools are also introduced such as taps, dies, lathes and milling machines used to create internal and external threads. Common thread types like metric, whitworth, buttress, pipe and multiple start threads are explained.

Uploaded by

Asiri Umayanga
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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fmdg iy tys ixjrO’kh

Development of Thread
fmdg jD;dldr is¥rl
fyda is,skavrdldr okavl ksh; yevhla
yd taldldrS wdk; yevhlska hQ;=j
fy,slaidldrsj jsysos hhs.
ප ොටකින් පෙපෙන ොර්ය
1) පෙොට් කෙස් කිීම් - Assembling

2) බස ්්පරේෂණය - Power Transmission


ප ොටක් නිෂ ානනය ෙෙන ්‍රම
1) gema lgq lÜg,h - Tap set
vhs leg lÜg,h - Die set

2) යන්ත්‍ර රමිනන්
Turning machines – lathes
Milling machines
CNC machines

3) වාත්තු කිීමරම රමිනන් - Casting

4) පෙෝල් කිීම් රමිනන් - Rolling


Thread

External Thread Internal Thread


(Male) (Female)
1. fmdfÜ ñkqï ,nd .ekSfï l%uh
wkqj
2. fmdfÜ yevh wkqj
3. fmdg lerlefjk osYdj wkqj
4. wdrïNl fmdgj,a ixLHdj wkqj
ISO metric screw threads - M
1) metric Standarded threads
2) metric fine threads
British Association screw threads - BS
1) British standard fine thread - BSF
2)British standard Whitworth - BSW
P = Pitch ,
wka;%d,h hkq
wkqhd; uqÿka
folla w;r
f¾Çh ÿr fõ'

= Pitch Angle

Lead = fmdgla
jghla iïmQ¾K
lsrSfïoS .uka
lrk ÿr fõ'
Self - locking Effect – 15Ÿ
Metric Thread Whitworthde Thread
60 - Metric Thread Profile Angle 55 - Whitworthde Thread Profile Angle

d1 - Minor Diameter
d2 - Pitch Diameter
d - Major Diameter
p - Pitch
t - Depth of Thread
 - Helix Angle
fmdgl m%udKh (Thread size) y`ÿkd .ekSu.
Major Diameter (mm)
British Whitworthde Thread
Metric ISO Thread
Major Diameter (inch)

M16 X 2 1 ½  TPI 6

Pitch (mm) Threads per inch

Metric Thread Whitworthde Thread


Standarded Thread Special Thread
(Medium Screws) ( Fine Screws)
ju;a yd ol=K;a fmdg
Left Hand Thread & Right Hand Thread

• Left Hand Thread = LH


• Right Hand Thread = RH
“V’’ Threads

Metric Thread Whitworthde Thread


Square Threads (Sq)
;%mSishudldr fmdg
Trapezoidal Thread (Tr)
Metric ISO Trapezoidal Thread

Tr 40 x 7
40 - Nominal Diameter in mm
7 - Pitch in mm
American Trapezoidal Thread (Acme)

1 ¾’’ - 4 Acme
1 3/4” - Nominal Diameter
4 - Threads per Inch
nÜg%ia fmdg Buttress Thread (S)

S 48 x 8
48 - Nominal Diameter
in mm
8 - Pitch in mm
rjqï fmdg
Round Thread , ( Knuckle Thread )(Rd)

Rd 40 x 5
40 - Nominal Diameter in mm
5 - Pitch in mm
Pipe Threads

Pipe Threads - straight


G 1 1/2’’ - (Internal) Taper Pipe Threads - (External Threads)
G 1 1/2’’ A - (External) R ½’’
Taper Pipe Threads -(Internal Threads)
Rp ½’’
;ks wdrïNhka iys; fmdg yd nyq wdrïNhka
iys; fmdg
Single Threads and Multiple Threads
Tr 40 x 7 Tr 40 x 7-LH

Tr 40 x Ph 14, P 7 Tr 40 x Ph 14, P 7-LH


or or
Tr 40 x Ph 14, P 7 Tr 40 x Ph 14, P 7 (double-
(double-start) start) -LH
Pitch Gauge or Thread Gauge
we;=,; fmdg lemSu iy gema lgq lÜg,h
Inside Thread Cutting & Tap Set

M 10 x 1.5

Drill bit diameter for tap hole = Nominal diameter - Pitch


vhs legh wdOdrfhka msg; fmdg lemSu
External Thread Cutting With The Threading Die

M 12 x 1.75

Turning Diameter = Nominal Diameter – Pitch


5
Turning Diameter ilia lsÍu fmdg lemsh hq;= È.
m%udKhg mukla iSud l< hq;= fõ

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