Unit 047: Advanced Turning. Screw threads
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1 Unit 047: Advanced Turning Screw threads
2 Starter activity When was the screw thread invented? Who was the inventor of the most famous screw thread form? When was the first unified British thread invented and by who?
3 Starter activity When was the screw thread invented? Around 400BC Who was the inventor of the most famous screw thread form? Archimedes When was the first unified British thread invented and by how? 1860
4
5 Starter activity 2 When was the metric thread form suggested as the preferred choice to replace the old British system? How many different types of thread forms are there?
6 Starter activity 2 When was the metric thread form suggested as the preferred choice to replace the old British system? 1965 How many different types of thread forms are there? 50 plus
7 Thread formats ACME-C Acme Thread-Centralizing ACME-G Acme Thread-General PurposeA MO American Standard Microscope Objective Thread ANPT Aeronautical National Form Taper Pipe Thread (Ground thread tap marked NPT) BA British Association Standard Thread BSF British Standard Fine Thread Series
8 Thread formats N BUTT American Buttress Screw Thread NC American National Coarse Thread Series NEF American National Extra Fine Thread Series NF American National Fine Thread Series NGO National Gas Outlet Thread NGT National Gas Taper Thread (see "SGT") NH American National Hose Coupling and Fire Hose Coupling Threads
9 Thread formats NPS For tap marking only (See NPSC, NPSM) NPSC American National Standard Straight Pipe Thread in Pipe Couplings (Tap marked NPS) NPSF Dryseal American National Standard Fuel Internal Straight Pipe Thread BSPP British Standard Pipe (Parallel) Thread NPSH American National Standard Straight Pipe Thread for Hose Couplings
10 Thread formats NPSI Dryseal American National Standard Intermediate Internal Straight Pipe Thread NPSL American National Standard Straight Pipe Thread for Loose Fitting Mechanical Joints with Locknuts NPSM American National Standard Straight Pipe Threads for Free-Fitting Mechanical Joints for Fixtures (Tap marked NPS)
11 Thread formats NPT American National Standard Taper Pipe Thread (See ANPT, NPTR) NPTF Dryseal American National Standard Taper Pipe Thread *UN Unified Constant Pitch Thread Series *UNC Unified Coarse Thread Series *UNEF Unified Extra Fine Thread Series *UNF Unified Fine Thread Series
12 Thread formats NPTR American National Standard Taper Pipe Thread for Railing Joints (Tap marked NPT) NS American National Thread-Special PTF Dryseal SAE Short Taper Pipe ThreadS GT Special Gas Taper Thread SPL-PTF Dryseal Special Taper Pipe Thread STI Special Thread for Helical Coil Wire Screw Thread Inserts Stub Acme Stub Acme Thread
13 Thread formats UNJ Unified Thread Series with a P to P Controlled Root Radius on External Thread only. UNJC Unified Coarse Thread Series with a P to P Controlled Root Radius on External Thread only. UNJF Unified Fine Thread Series with a P to P Controlled Root Radius on External Thread only.
14 Thread formats UNRC Unified Coarse Thread Series with a 0.108P to 0.144P Controlled Root Radius; Ext. thread only. UNRF Unified Fine Thread Series with a 0.108P to 0.144P Controlled Root Radius; External thread only. *UNS Unified Thread-Special V A 60 "V" thread with Truncated Crest and Root. The theoretical "V" Form is usually flatted to the user's specifications.
15 Thread formats BSPT British Standard Taper Pipe Thread BSW British Standard Whitworth Coarse Thread Series M Metric ScrewThread Series N American National 8, 12 and 16 Thread Series (8N, 12N, 16N) WHIT British Standard Whitworth Special Thread
16 Thread formats UNM Unified Miniature Thread Series UNR Unified Constant Pitch Thread Series with a 0.108P to 0.144P Controlled Root Radius; Ext. thread only.
17 Thread nomenclature
18 Thread nomenclature
19 Thread nomenclature
20 Thread nomenclature
21 Multi start threads
22 Thread forms Square. Size unlimited. No accepted relationship between pitch and diameter. Used for transmission of power, little friction.
23 Thread forms Acme. Size: unlimited. Replaces the square thread for many purposes, e.g. lathe, lead screws, power transmission and motion.
24 Thread forms Buttress. Size: unlimited. Used for quick release mechanism, e.g. vice.
25 Thread forms B.A (British Association) No. 0 to No. 10. Used for small instrument work. A full range goes down to No. 30. Teeth expressed in pitch not TPI
26 Thread forms B.S.W (British Standard Whitworth) 1/8 to 3. Coarse pitch, used for general engineering and for threads in soft materials. B.S.F (British Standard Fine) 3/16 to 2. Fine pitch, used for parts subject to vibration; lock nuts
27 Thread forms ISO (International Organization for Standardization) Metric system is now adopted as the standard screw thread in this country. The thread form shown is that for a nut. P= Pitch H= Height
28 Making thread forms Thread Milling
29 Making thread forms Thread Milling - ext
30 Making thread forms Thread Rolling
31 Internal threads Internal threads are produced with taps. This is a First tap which is used to start producing the thread form in a hole
32 Internal threads This is a Second or Intermediate tap which is used after the First tap has been used.
33 Internal threads This is a Plug or Bottoming tap which is used to finish the threaded hole.
34 External threads Split dies are used to produce external threads on a diameter.
35 External threads A die nut is normally used to repair a thread that has become damaged.
36 Die and tap holders Die Stock Tap Wrench 3 2 1
37 Assessment for learning You need be able to know the nomenclature of threads and how they can be produced. Completing HF WS003 and WS007 will help reinforce your knowledge on the topic?
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