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Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002139
EISBN: 978-1-62708-188-7
... Abstract Tapping is a machining process for producing internal threads. This article provides a discussion on machines and accessories of tapping. It reviews the seven categories of taps, namely, solid, shell, sectional, expansion, inserted-chaser, adjustable, and collapsible taps, as well...
Abstract
Tapping is a machining process for producing internal threads. This article provides a discussion on machines and accessories of tapping. It reviews the seven categories of taps, namely, solid, shell, sectional, expansion, inserted-chaser, adjustable, and collapsible taps, as well as their design and functions. It explains the influences of various factors on the selection of tap design features and discusses the principal factors that influence the selection of equipment and procedure for tapping. The article reviews the factors that determine torque demand. It also provides an overview of tap materials and surface treatment and concludes with a discussion on tapping of taper pipe threads.
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Published: 30 November 2018
Fig. 26 Self-tapping and self-drilling screws. (a) Stainless steel self-tapping screw. (b) 7075-T6 aluminum thread-forming screw into plastic. (c) Thread forming into cast aluminum blind hole with steel ALtracs screw. (d) Thread forming into cast aluminum with steel Taptite 2000 screw. (e
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Published: 30 September 2015
Fig. 12 Influence of carbon/MnS addition for the moment during tapping. M5 straight flute tap with 7.2 mm (0.28 in.) tap length. Bottom hole was used in the initial investigation.
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Published: 09 June 2014
Fig. 11 Tapping a 13.5 ton induction crucible furnace in a ladle for magnesium treatment and extracting fumes through the furnace hood
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Published: 09 June 2014
Fig. 43 Melt temperatures in the transport ladle before tapping and in the pouring basin over a production time of 4 h at 7.2 tons/h pouring output. Source: Ref 43
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in Operation of Induction Furnaces for Steel and Non-iron Materials
> Induction Heating and Heat Treatment
Published: 09 June 2014
Fig. 1 A 38 ton 16 MW/250 Hz induction crucible furnace before tapping in a steel foundry. Source: Ref 4
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in Operation of Induction Furnaces for Steel and Non-iron Materials
> Induction Heating and Heat Treatment
Published: 09 June 2014
Fig. 7 A 2.5 ton aluminum melting furnace during tapping
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in Operation of Induction Furnaces for Steel and Non-iron Materials
> Induction Heating and Heat Treatment
Published: 09 June 2014
Fig. 20 Tapping a copper sintering melt from a 30 ton 6 MW/100 Hz induction crucible furnace. Courtesy of ABP Induction Systems. Source: Ref 4
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Published: 30 September 2015
Fig. 16 Stacked sieves on a shaker with rotary and tapping action
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Published: 01 January 1989
Fig. 12 Effect of hardness on the tapping of carbon and low-alloy steel. (a) 1 4 -28 UNF through holes. (b) 1 2 -20 UNF through holes Tapping conditions (holes of both diameters) Type of machine Automatic tapping Depth of through holes, mm (in.) 32 (1
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Published: 01 January 1989
Fig. 13 Tapping of seam-welded couplings Tap details Material M1 high-speed steel Number of flutes 6 Overall length, mm (in.) 380 (15) Chamfer length, mm (in.) 27.4 (1 5 64 ) Chamfer angles (double) 10° 15′ and 4° 36′ Operating conditions Speed
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Published: 01 January 1989
Fig. 16 Effect of work metal and speed on torque in taper tapping. Data were obtained with 1 8 -27 NPT high-speed steel taps for cutting threads in 8.61 mm (0.339 in.) deep straight reamed holes to gage line. Sulfurized oil was used as cutting fluid.
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Published: 01 January 1989
Fig. 18 Effect of method of grinding top chamfer on torque for tapping workpieces of three different metals. Speed: 18 m/min (60 sfm); other conditions, same as for Fig. 15 .
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Published: 01 January 1989
Fig. 19 Effect of type of cutting fluid on torque required for tapping gray iron. Speed: 18 m/min (60 sfm); other conditions, same as for Fig. 15 .
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Published: 01 January 1989
Fig. 20 Effect of method of holding tap on torque required for tapping gray iron. Speed: 18 m/min (60 sfm); no cutting fluid; other conditions, same as for Fig. 15 .
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Published: 01 January 1989
Fig. 6 Torque transducer used to monitor in-process torque generated in tapping operations
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Published: 01 January 1989
Fig. 11 Plot of tapping force against time for three conditions: (a) normal cutting, (b) tool breakage, and (c) tool missing. See text for discussion.
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Published: 01 January 1989
Fig. 32 Progressive modification of tap design for tapping 1 4 –32 threads in stainless steel valve bonnets. (a) Original design: four-flute plug tap with conventional relief. Life: 2 holes. (b) Changed to two-flute tap with spiral point and 70% land relief. Life: 8 holes. (c) Two
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Published: 01 January 1989
Fig. 16 Untreated versus nitrided and chromium-plated taps in tapping an alloy C61000 connector sleeve (95 HRB). Tapping was done in a vertical drill press. Dimensions in figure given in inches Condition or result (a) Untreated taps Treated taps Spindle speed, rev/min 575 900
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