75:(themselves made with painstaking-and-precise layout). The jig borer was invented to expedite the making of drill jigs, but it helped to eliminate the need for drill jigs entirely by making quick precision directly available for the parts that the jigs would have been created for. The revolutionary underlying principle was that advances in machine tool control that expedited the making of jigs were fundamentally a way to expedite the cutting process itself, for which the jig was just a means to an end. Thus, the jig borer's development helped advance machine tool technology toward later
55:
43:-style readouts and verniers) on particularly carefully made shafts with a strong degree of gearing; this allows positions to be set on the two axes to an accuracy of 0.0001 inches (2.5 Ξm). It is generally used to enlarge to a precise size smaller holes drilled with less accurate machinery in approximately the correct place (that is, with the small hole strictly within the area to be bored out for the large hole).
35:
with a higher degree of positioning precision (repeatability) and accuracy than those provided by general machines. Although capable of light milling, a jig borer is more suited to highly accurate drilling, boring, and reaming, where the quill or headstock does not see the significant side loading
46:
Jig borers are limited to working materials that are still soft enough to be bored. Often a jig is hardened; for a jig borer this requires the material to be bored first and then hardened, which may introduce distortion. Consequently, the
109:"In many cases, a jig borer is a 'jig eliminator.' In other words, such a machine may be used instead of a jig either when the quantity of work is not large enough to warrant making a jig or when there is insufficient time for jig making."
90:
working routinely in "tenths" (ten-thousandths of an inch, 0.0001 inch) as a fast, everyday machine capability (whereas it had been the exclusive domain of special, time-consuming, craftsman-dependent manual skills);
83:
development. The jig borer was a logical extension of manual machine tool technology that began to incorporate some then-novel concepts that would become routine with NC and CNC control, such as:
27:
invented at the end of World War I to enable the quick and precise location of hole centers. It was invented independently in
Switzerland and the United States. It resembles a specialized kind of
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A typical jig borer has a work table of around 400 by 200 millimetres (15.7 in à 7.9 in) which can be moved using large handwheels (with
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was developed as a machine with the precision of the jig borer, but capable of working materials in their hardened state.
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that it would with mill work. The result is a machine designed more for location accuracy than heavy material removal.
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The technological advances that led to the jig borer and NC were about to usher in the age of CNC and
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coordinate dimensioning (dimensioning of all locations on the part from a single reference point);
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Before the jig borer was developed, hole center location had been accomplished either with
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Several innovations in the development of the jig borer were the work of the
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121:, formed by grinding, rather than a soft leadscrew with a compensating nut.
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71:(either quickly-but-imprecisely or painstakingly-and-precisely) or with
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186:. Bridgeport, Connecticut, USA: Moore Tool Company. pp. 159â162.
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132:, radically changing the way people manufacture many of their goods.
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218:, 5th ed. New York: Industrial Press, 1964, Volume 1, p. 358.
151:, 2nd ed. New York: Industrial Press, 1981, Volume 1, p. 403.
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Machine to very precisely drill, bore and ream holes
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117:, such as the adoption of hardened and accurate
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184:Foundations of Mechanical Accuracy
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543:Electrical discharge machining
332:Numerical control (NC and CNC)
94:circumventing jigs altogether.
1:
216:Machine Shop Training Course
103:Machine Shop Training Course
390:List of drill and tap sizes
1134:
706:Magnetic switchable device
115:Moore Special Tool Company
58:A DeVlieg 43K-48 Jig Mill.
1025:
882:
784:
548:Electrochemical machining
261:
1066:Machine and metalworking
1076:Measuring and alignment
987:Rotary transfer machine
628:Rotary transfer machine
613:Photochemical machining
553:Electron-beam machining
515:Tool and cutter grinder
972:Oxy-fuel cutting torch
147:Moltrecht, Karl Hans:
59:
824:Tools and terminology
149:Machine Shop Practice
57:
1041:Cutting and abrasive
742:Machining vibrations
648:Ultrasonic machining
762:Tool and die making
450:Cylindrical grinder
214:Jones, Franklin D.
33:tool and die makers
430:Abrasive machining
101:, in his textbook
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1100:
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105:(5th ed), noted:
99:Franklin D. Jones
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927:Grinding machine
897:Ball-peen hammer
864:
857:
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841:
747:Speeds and feeds
500:Sharpening stone
475:Grinding machine
470:Grinding dresser
337:Stewart platform
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1002:Thread restorer
892:Automatic lathe
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510:Surface grinder
445:Coated abrasive
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380:Drill bit sizes
375:Drill bit shank
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180:Moore, Wayne R.
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29:milling machine
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1031:Types of tools
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962:Milling cutter
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603:Milling cutter
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480:Grinding wheel
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302:Computer-aided
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31:that provides
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982:Plasma cutter
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701:Machine taper
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686:Indexing head
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658:Machine tools
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505:Spark testing
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460:Flick grinder
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455:Diamond plate
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440:Bench grinder
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435:Angle grinder
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295:and computing
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26:
23:is a type of
22:
1012:Turret lathe
952:Machine tool
941:
875:metalworking
716:Rotary table
696:Lathe center
583:Machine tool
577:
415:Grinding and
255:Metalworking
215:
210:
183:
164:Moore (1970)
148:
143:
123:
112:
102:
97:
66:
45:
38:
25:machine tool
20:
18:
1113:Hole making
1091:Woodworking
997:Tap and die
957:Metal lathe
922:Gear shaper
907:Drill press
887:Arbor press
794:Fabrication
730:Terminology
666:Angle plate
593:Metal lathe
485:Jig grinder
395:Tap and die
304:engineering
49:jig grinder
1107:Categories
814:Metallurgy
608:Pantograph
400:Tap wrench
193:0262130807
136:References
119:leadscrews
73:drill jigs
41:micrometer
942:Jig borer
809:Machining
804:Jewellery
772:Workpiece
767:Tramp oil
757:Tolerance
588:Machining
578:Jig borer
563:Engraving
538:Broaching
525:Machining
405:Threading
370:Drill bit
352:threading
293:Machining
21:jig borer
1046:Forestry
1036:Cleaning
1007:Tool bit
912:End mill
819:Smithing
558:End mill
465:Grinding
425:Abrasive
385:Drilling
360:Die head
347:Drilling
202:73127307
182:(1970).
1071:Masonry
1061:Kitchen
932:Hacksaw
871:Machine
829:Welding
799:Forming
789:Casting
721:Wiggler
711:Mandrel
681:Fixture
643:Turning
638:Skiving
598:Milling
573:Hobbing
495:Sanding
490:Lapping
417:lapping
63:History
1081:Mining
1051:Garden
1017:Welder
992:Shaper
977:Planer
902:Broach
676:Collet
633:Shaper
623:Reamer
618:Planer
568:Facing
533:Boring
327:G-code
200:
190:
69:layout
1086:Power
947:Lathe
877:tools
752:Swarf
671:Chuck
365:Drill
1056:Hand
967:Mill
873:and
312:2.5D
198:LCCN
188:ISBN
79:and
19:The
937:Hob
691:Jig
349:and
322:CAM
317:CAD
130:CAM
126:CAD
91:and
81:CNC
1109::
196:.
171:^
156:^
77:NC
863:e
856:t
849:v
285:e
278:t
271:v
247:e
240:t
233:v
204:.
128:/
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