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high speed (such as at 175,000 rpm). The machines have a standard X-Y table with the notable exception of knee travel. All axes are indexed to an accuracy resembling 0.0001" via a vernier scale on the handwheels, with higher accuracy available with the use of measuring bars. The machine head has two vertical travels, one for rough head adjustment and the other for precise spindle adjustment. To change the diameter of the hole to be ground, the air spindle can be offset from the axis of the rotary head by a slide in a similar manner to a boring head for a milling machine, allowing a hole of any size to be ground with the same tooling (up to the machine's capacity). This offset can be adjusted while running and can typically outfeed about 0.100", again with an accuracy of 0.0001" on the handwheel or greater, for very precise hole, peg, and surface grinding. A well-kept jig grinder will reliably position work to a higher degree of accuracy than is possible with handwheels alone. These features are all critical in positioning a hole-and-peg system a precise distance from a reference surface or edge.
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161:). It is used almost exclusively by tool and die makers in the creation of jigs or mating holes and pegs on dies. There are usually many peripheral elements to a large jig grinder, including separate hydraulic motors, air compressors, and various cooling systems for both the hydraulic circuit and supplying coolant to the work and machine itself.
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The machine operates by a high-speed air spindle rotating a grinding bit. The air spindles are removable and interchangeable to achieve varying surface speeds. Some spindles are fixed speed (such as at 60,000 rpm), others are adjustable (such as from 30,000 to 50,000 rpm), and still others are very
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The most important factor on a jig grinder is the dual-spindle configuration. The main spindle is roughly positioned with between 1" or 2" of travel for setup, and then the 0.100" of outfeed is used during machine operation to outfeed into the work. A spacer bar may be used between the grinder and
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On
October 19, 2022, the United States Department of Justice charged four individuals and two companies with violating U.S. export laws by attempting to smuggle a jig grinder, which is a dual use, export-controlled item, to Russia.
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main spindle, allowing large (9" radius or larger) work to be completed. The main spindle has a wide range of speeds to ensure proper grinder feed rates are maintained.
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214:(Illustrated ed.). Tata McGraw-Hill Education
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153:are very accurate (far more so than a manual
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208:Venkatesh, Izman; Venkatesh, V.C. (2007).
106:Learn how and when to remove this message
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145:The jig grinder is very similar to a
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545:Electrical discharge machining
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615:Photochemical machining
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517:Tool and cutter grinder
126:jig grinder. Wrenches,
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826:Tools and terminology
211:Precision Engineering
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744:Machining vibrations
650:Ultrasonic machining
40:improve this article
764:Tool and die making
452:Cylindrical grinder
432:Abrasive machining
193:. 19 October 2022.
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96:February 2022
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57: –
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55:"Jig grinder"
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51:Find sources:
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35:
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29:This article
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18:
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718:Rotary table
698:Lathe center
585:Machine tool
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417:Grinding and
257:Metalworking
216:. Retrieved
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140:machine tool
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128:1-2-3 blocks
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38:Please help
33:verification
30:
796:Fabrication
732:Terminology
668:Angle plate
595:Metal lathe
487:Jig grinder
397:Tap and die
306:engineering
136:jig grinder
816:Metallurgy
610:Pantograph
402:Tap wrench
218:2013-04-02
177:References
66:newspapers
811:Machining
806:Jewellery
774:Workpiece
769:Tramp oil
759:Tolerance
590:Machining
580:Jig borer
565:Engraving
540:Broaching
527:Machining
407:Threading
372:Drill bit
354:threading
295:Machining
147:jig borer
846:Category
821:Smithing
560:End mill
467:Grinding
427:Abrasive
387:Drilling
362:Die head
349:Drilling
151:spindles
831:Welding
801:Forming
791:Casting
723:Wiggler
713:Mandrel
683:Fixture
645:Turning
640:Skiving
600:Milling
575:Hobbing
497:Sanding
492:Lapping
419:lapping
202:Sources
80:scholar
678:Collet
635:Shaper
625:Reamer
620:Planer
570:Facing
535:Boring
329:G-code
82:
75:
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61:
53:
754:Swarf
673:Chuck
367:Drill
159:lathe
138:is a
124:Moore
87:JSTOR
73:books
314:2.5D
59:news
693:Jig
351:and
324:CAM
319:CAD
157:or
42:by
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