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Gun drilling
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Image
Published: 01 January 1989
Fig. 11 Two methods of gun drilling. (a) Workpiece rotates while the tool is held stationary. Cutting fluid is fed directly through the drill from the back end. (b) Tool rotates while the workpiece is held stationary. Cutting fluid is fed through a rotating oil gland from the fluid feed line
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Image
Published: 01 January 1989
Fig. 17 Two types of straight-flute gun drills used in deep-hole drilling. (a) Trepanning drill. (b) Center-cut drill
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Image
Published: 01 January 1989
Fig. 7 Aircraft brake carrier drilled with carbide-tip gun drill. Dimensions in figure given in inches Drilling conditions Speed, m/min (sfm) 95 (313) Feed, mm/rev (in./rev) 0.038 (0.0015) Cutting fluid Mineral oil Tolerance, mm (in.) Straightness within 0.13 (0.005
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Image
in Niobium-Titanium Superconductors
> Properties and Selection: Nonferrous Alloys and Special-Purpose Materials
Published: 01 January 1990
Fig. 7 Cross section of a 54-filament composite fabricated using gun-drilled billets. The Cu:Sc ratio is 1.35:1. Courtesy of Supercon, Inc.
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in Niobium-Titanium Superconductors
> Properties and Selection: Nonferrous Alloys and Special-Purpose Materials
Published: 01 January 1990
Fig. 8 Cross section of a 24-filament composite fabricated using gun-drilled billets. The Cu:Sc ratio is 7:1. Courtesy of Supercon, Inc.
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Image
Published: 01 January 1989
Image
Published: 01 January 2005
Fig. 19 Progression of a gun-drilled and turned blank through two-operation swaging, including rifling with a fluted mandrel, to produce a gun barrel. Dimensions given in inches Operating condition Gun drilling Turning Speed, rpm 1750 500 Speed, sfm 343 98 Feed 2 3
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Book Chapter
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002135
EISBN: 978-1-62708-188-7
... ( Fig. 10 ). These machines may be of either the horizontal or the vertical type, with either single-spindle or multiple-spindle construction. In addition, either the workpiece or the drill may revolve. Most machines are of horizontal construction, using a center-cut gun drill having a single cutting...
Abstract
This article focuses on machines that are designed, constructed, and used for drilling. It provides information on the design, materials, selection, and classification of drill. The article describes drills that are specially designed for hard steel and other specific applications. A variety of drill point styles, such as single-angle points and reduced-rake points, are described. The article discusses the factors considered to obtain expected dimensional accuracy of holes. It explains the determination of the optimum speed and feed for drilling, which depends on the workpiece material, tool material, depth of hole, design of drill, rigidity of setup, tolerance, and cutting fluid. The article illustrates the effects of operating variables on drill life of hardened steel. The advantages, limitations, design considerations, insert configurations, and applications of indexable-insert drills are discussed. The article concludes with a discussion on the requirements to drill small holes that differ from those used in conventional drilling.
Image
Published: 31 October 2011
Fig. 14 Inexpensive method of mounting portable hand gun to machine slide or drill press to obtain fixed-position accuracy
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Image
Published: 01 January 1993
Fig. 14 Inexpensive method of mounting portable hand gun to machine slide or drill press to obtain fixed-position accuracy
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Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002164
EISBN: 978-1-62708-188-7
.... Competitive Processes Shaped tube electrolytic machining competes with the following processes: Gun drilling: Limited to 1.9 mm (0.076 in.) minimum diameter in easier-to-machine metals. It is possible to drill nonstainless metals with closer tolerances, but usually only a small number of parallel...
Abstract
Shaped tube electrolytic machining (STEM) is a modified electrochemical machining (ECM) process that uses an acid electrolyte so that the removed metal goes into the solution instead of forming a precipitate. This article lists some specific machining applications of the STEM process, including turbine blade cooling holes, turbine vane cooling holes, turbine disk cooling passages, oil passages, and fuel nozzles. It describes the limitations and advantages of the STEM process. The article discusses the various tool parts of the STEM system, including the holding fixture, guide for cathodes, cathodes, and cathode holder/manifold. The article concludes with information on the process parameters of the STEM system.
Book Chapter
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002186
EISBN: 978-1-62708-188-7
... . Feed depends on hole size and usually ranges from 0.025 to 0.76 mm/rev (0.001 to 0.030 in./rev) for holes (1.6 to 51 mm ( 1 16 to 2 in.) in diameter, as shown in Table 2 . Nominal speeds and feeds for the drilling, gun drilling, reaming, and counterboring of magnesium alloys Table 2...
Abstract
Magnesium is machined in low-volume production on small, manually operated machine tools and on large, specially built, completely automated transfer machines operating at high production rates. This article focuses on the factors that affect the machining of magnesium. It discusses chip formation and distortion due to thermal expansion, cold work, and clamping and provides information on magnesium-matrix composites. The article describes materials, design, and sharpness as factors for selection of tool for machining magnesium. It illustrates turning and boring, planing and shaping, broaching, drilling, reaming, counterboring, milling, sawing, and grinding operations performed on magnesium. Safety measures related to machining, handling of chips and fines, and fire extinguishing are also discussed.
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002188
EISBN: 978-1-62708-188-7
... between the work and tailstock. Spade drills are made of high-speed steel; the cutting edges can be tipped with carbide. Lead holes should be made with a drill having a point smaller than that of the spade drill. Table 7 lists speeds and feeds for spade drilling. Speeds and feeds for the spade and gun...
Abstract
Nickel-base alloys can be machined by techniques that are used for iron-base alloys. This article discusses the effects of distortion and microstructure on the machinability of nickel alloys. It tabulates the classification of nickel alloys based on machining characteristics. The article describes the machining operations performed on nickel alloys, such as turning, planing and shaping, broaching, reaming, drilling, tapping and threading, milling, sawing, and grinding. It provides information on the cutting fluids used in the machining of nickel alloys. The article also analyzes nontraditional machining methods that are suitable for shaping high-temperature, high-strength nickel alloys. These include electrochemical machining, electron beam machining, and laser beam machining.
Book Chapter
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002136
EISBN: 978-1-62708-188-7
... economically by other processes, such as drilling, boring, or core drilling. When more than 0.5 mm (0.020 in.) on diameter must be removed from a hole less than 50 mm (2 in.) in diameter, special reaming methods or boring is usually considered. Special reaming methods may include the use of gun reamers...
Abstract
Reaming is a machining operation in which a rotary tool takes a light cut to improve the accuracy of the round hole and reduce the roughness of the hole surface. This article describes its process capabilities and provides information on workpiece material and hardness, as well as the machines used. Reamer materials and design, speed and feed, bushings and fixtures, and cutting fluids used are also discussed. The article outlines the factors to be considered while selecting a reamer. It also discusses the applications of the principle types of reamers, namely, straight-flute chucking, spiral-flute chucking, adjustable, end-cutting, shell, floating-blade, gun, and special-purpose reamers, with examples.
Book Chapter
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002131
EISBN: 978-1-62708-188-7
... per piece to 1.8 min (less than half, compared with the original method) and doubled tool life to 50 pieces per sharpening. Deep Holes Trepanning is often the most practical method of machining deep holes or tubes from the solid. Deep-hole Trepanning is similar to gun drilling (see the article...
Abstract
Trepanning is used in at least four distinct production applications: round disks, large shallow through holes, circular grooves, and deep holes. This article provides an overview of the first three applications. It describes the machines, tools, techniques, and cutting fluids used for deep-hole trepanning. The article contains a table that lists speeds and feeds for the deep-hole trepanning of various steels with high-speed tool steels and carbide tools.
Book Chapter
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002184
EISBN: 978-1-62708-188-7
...). In addition, diamond-tip, coolant-fed gun drills have achieved even higher productivity gains with much better tool life in holes up to eight times diameter. Thread forming taps have the longest tool life and can be run at speeds to 20 m/min (70 sfm). They also produce stronger threads than thread cutting...
Abstract
This article begins with a discussion on the classification of aluminum alloys and the selection of alloy and temper based on machinability. It provides an overview of cutting force and power, tool design and material, and general machining conditions. In addition, the article discusses distortion and dimensional variation and machining problems during the machining of high-silicon aluminum alloy. It also provides information on tool design and material, speed and feed, and the cutting fluid used for various machining processes, namely, turning, boring, planing and shaping, broaching, reaming, tapping, milling, sawing, grinding, honing, and lapping. The article concludes with a discussion on drilling operations in automatic bar and chucking machines and drill presses.
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002167
EISBN: 978-1-62708-188-7
...-drilling applications. Equipment Description The high-velocity electron beam is generated in an electron beam gun ( Fig. 1 ) that accelerates free electrons to speeds in excess of 60% of the speed of light. The free electrons are created when the tungsten filament of the cathode is heated by passing...
Image
Published: 31 October 2011
Fig. 13 Portable stud arc welding gun equipped with accessories for welding studs through or into a drilled or formed hole
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Image
Published: 01 January 1993
Fig. 13 Portable stud arc welding gun equipped with accessories for welding studs through or into a drilled or formed hole
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Book Chapter
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002183
EISBN: 978-1-62708-188-7
... Abstract This article provides a discussion on cutting tools, their materials and design; cutting fluids; and various aspects of machining operations of heat-resistant alloys, with several examples. Operations such as turning, planing and shaping, broaching, drilling, reaming, counterboring...
Abstract
This article provides a discussion on cutting tools, their materials and design; cutting fluids; and various aspects of machining operations of heat-resistant alloys, with several examples. Operations such as turning, planing and shaping, broaching, drilling, reaming, counterboring and spotfacing, tapping and thread milling, milling, sawing, and grinding are discussed. Nominal compositions of wrought heat-resistant alloys and nickel-base heat-resistant casting alloys, as well as compositions of cobalt-base heat-resistant casting, iron-base heat-resistant casting, and mechanically alloyed (oxide dispersion strengthened) products are also listed.