كتاب Screwcutting in the Lathe - for Home Machinists
منتدى هندسة الإنتاج والتصميم الميكانيكى
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منتدى هندسة الإنتاج والتصميم الميكانيكى
بسم الله الرحمن الرحيم

أهلا وسهلاً بك زائرنا الكريم
نتمنى أن تقضوا معنا أفضل الأوقات
وتسعدونا بالأراء والمساهمات
إذا كنت أحد أعضائنا يرجى تسجيل الدخول
أو وإذا كانت هذة زيارتك الأولى للمنتدى فنتشرف بإنضمامك لأسرتنا
وهذا شرح لطريقة التسجيل فى المنتدى بالفيديو :
http://www.eng2010.yoo7.com/t5785-topic
وشرح لطريقة التنزيل من المنتدى بالفيديو:
http://www.eng2010.yoo7.com/t2065-topic
إذا واجهتك مشاكل فى التسجيل أو تفعيل حسابك
وإذا نسيت بيانات الدخول للمنتدى
يرجى مراسلتنا على البريد الإلكترونى التالى :

Deabs2010@yahoo.com


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 كتاب Screwcutting in the Lathe - for Home Machinists

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تاريخ التسجيل : 01/07/2009
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مُساهمةموضوع: كتاب Screwcutting in the Lathe - for Home Machinists    كتاب Screwcutting in the Lathe - for Home Machinists  Emptyالثلاثاء 15 نوفمبر 2022, 12:46 am

أخواني في الله
أحضرت لكم كتاب
Screwcutting in the Lathe - for Home Machinists
Reference Handbook for Both Imperial and Metric Projects
Martin Cleeve

كتاب Screwcutting in the Lathe - for Home Machinists  S_s_i_11
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Contents
Acknowledgment
SECTION 1
INTRODUCTION
Introductory notes – Conversion notes –
Quick reference thread sizing formulas
SECTION 2
PRINCIPLES OF LATHE SCREWCUTTING
Altering the pitch – Calculations – Simple and
compound gear trains – Schematic gear train
presentation – Calculations for mixed number
TPI – Equal ratio setting – Threads
designated by lead – Proving gear trains –
Self-act feeds from leadscrews – Diametral
pitch worms – Formula for worms by DP –
The DP formula – how evolved – Proving
worm thread gearing.
SECTION 3
GEARING AN ENGLISH LEADSCREW FOR
METRIC THREADS
50-127 translation ratio explained – Basic
conversion formula – Checking metric gear
trains – Modified gearing systems for metric
pitches with an English leadscrew – Reduced
pitch translators – Alternative translationgearing – The 2-21 (63-160) method –
Checking the 2-21 gearing – 13-33 translation
gearing and 15-38 – Worms sized by module
– Gearing an English leadscrew, practical
examples.
SECTION 4
LATHES WITH METRIC LEADSCREWS
Probable standard pitches for metric
leadscrews – Screwcutting calculations –
Gearing for English threads with a metric
leadscrew – Disadvantages of 127-50 step up
– Disadvantages overcome by alternative
translation ratios – Very small pitch errors –
Proving metric – English gear trains – Finding
exact pitch given – Quick checking for
nominal pitch – Worms for gears sized by
module: gearing with metric leadscrew –
Worms sized by DP: gearing with metric
leadscrew – Change gear calculations by
approximation.
SECTION 5
PROBLEMS AND ANALYSIS OF REPEAT
PICK-UP
Meaning of pick-up – Examples – The thread
dial indicator or leadscrew indicator – Action
of English indicator – Metric threads: pick-up –
Geared leadscrew indicators – Special
application of leadscrew indicator: How to
pick-up for short metric threads being cut from
an English leadscrew – Leadscrew indicator
for metric leadscrews – Pick-up when gearing
is approximate – Repeat pick-up from chalkmarks – Repeat pick-up: electrical indication –
Pick-up with dog-clutch control – Advantages
and theory – A little-known method for
obtaining even faster screwcutting with dogclutch control – Calculating metric pick-up.
SECTION 6
MULTIPLE-START THREADS
Automatic start indexing (by dog-clutch
control) – Designation of multiple start threads
– Feasibility test (to ascertain whether or not
any given leadscrew is suitable for indexing a
required number of starts automatically) –
Pick-up for automatic multiple start indexing –
Metric multiple start threads from an English
leadscrew – Automatic start indexing
possibilities by dog-clutch control explained –
Automatic start indexing of metric multiplestart threads from metric leadscrews – Special
leadscrews for auto-start indexing – Special
leadscrew design formula: For metric working,
for English working – Example of lathe with
dog-clutch control to the leadscrew drive.
SECTION 7
SINGLE POINT LATHE THREADING TOOLS
Various single point threading tools discussed
– High speed steel – Stellite – Blackalloy –
Tungsten Carbide – Carbon steel – Cutting
angles – Internal threading tools – Inserted bit
tools – Internal thread tool bit fitted by brazing,
a tested design – Thread tool sharpening and
grinding – A simple jig for the production of
accurate angles and a new design retractable,adjustable height, swing-clear, general
purpose and threading toolholder – The
thread tool grinding jig described –
Sharpening external and internal threading
tools of various types: solid-with-shank and
inserted bit.
SECTION 8
PRACTICAL ASPECTS OF LATHE
SCREWCUTTING
Four ways of depthing a screw thread – Five
ways of depthing a nut thread – Square
thread cutting – Acme thread cutting – Nut
threads: notes on bore sizing – The
percentage approach to bore sizing for nuts –
Tap finishing – Special tap making – Multiplestart threads – How cut in lathe without dogclutch control – Multiple-start nut threading –
How cut in lathe without dog-clutch control –
Multiple start thread indexing by use of
leadscrew indicator – Multiple-start worm
thread notes – General observations: Thread
crest radii – Taper threads – Improvised
cutting method – Screwcutting speeds –
Lubrication – Effect of coolant on light cuts –
Screwcutting troubles, possible causes.
SECTION 9
PRACTICAL THREAD SIZING
MEASUREMENT
Definitions of screw thread terms – The 3-
Wire method of thread checking – Wire
diameters and thread depth – Three wire
formula for 55 deg. screws – Checking Whit,thread by metric measure – One-wire
checking – Pitch diameter calculations –
Acme thread checking – Summary of formula
for 1-wire checking – Helix angle of screw
threads – Formula – Gauging nut threads –
Thread classes – Threads designated by class.
APPENDIX
LIST OF TABLES
Appendix
1
LIST OF TABLES
General conversion formulas
Quick reference thread information summary
Table T1 – Gearing for threads/inch from a
leadscrew of 8 T.P.I.
Table T2 – Gearing for threads/inch from a
leadscrew of 10 T.P.I.
Table T3 – List of approximations for Pi
Table T3A – Gearing for worm threads sized by
diametral pitch
Table T3B – A selection of close ratios factorised into
two or three element ratios
Table T4 – Gearing an 8 T.P.I. leadscrew for metric
thread pitches
Table T5 – List of approximations for 50/127
Table T6 – Metric pitches from a leadscrew of 8 T.P.I.
gears 20-20-75 by fives (plus one 38)
Table T7 – Approximations for Pi x 50/127
Table T8 – Gearing for threads/inch from a
leadscrew of 3mm pitch, gears 20-20-75
(plus one 38)
Table T9 – In-line metric/imperial conversion forleadscrews of from 3.0 to 7.0 mm pitch or
lead
Table T10 – Basic gear ratios for metric pitches from a
leadscrew of 4 threads/inch
Table T11 – Basic gear ratios for threads/inch from a
leadscrew of 6.0 mm pitch
Table T12 – Secant factors for oblique top-slide
depthing
Table T13 – Maximum root widths, Acme threads


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