Your IP: 3.238.174.50 United States Near: United States

Lookup IP Information

1 2 3 4 5 6 7 8 Next

Below is the list of all allocated IP address in 227.219.0.0 - 227.219.255.255 network range, sorted by latency.

The jig borer is a type of machine tool invented at the end of World War I to make possible the quick-yet-very-precise location of hole centers. It was invented independently in the United States and Switzerland.[1] It can be viewed as a specialized species of boring mill or milling machine that provided tool and die makers with a higher degree of positioning precision (repeatability) and accuracy than those general machines had previously provided. History Before the jig borer was developed, hole center location had been accomplished either with layout (either quickly-but-imprecisely or painstakingly-and-precisely) or with drill jigs (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 NC and CNC 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: coordinate dimensioning (dimensioning of all locations on the part from a single reference point); working routinely in "tenths" (ten-thousandths of an inch, 0.0001") as a fast, everyday machine capability (whereas it formerly was the exclusive domain of special, time-consuming, craftsman-dependent manual skills); and circumventing jigs altogether. Franklin D. Jones, in his textbook Machine Shop Training Course (5th ed),[2] recorded insightfully: "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." One wonders whether Jones could have suspected the revolutionary implications of the abstract principle behind that very practical observation (i.e., 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). The technological advances that led to the jig borer and NC were about to usher in the age of CNC and CAD/CAM, radically changing the way humans manufactured many of their goods. The awesome potential of control technology that would gradually eliminate many needs for jigs—and also often eliminate the need for the jobs of the operators who used them—was little appreciated outside of a few R&D laboratories when Jones recorded his insight. References ^ Moltrecht, Karl Hans: Machine Shop Practice, 2nd ed. New York: Industrial Press, 1981, Volume 1, p. 403. ^ Jones, Franklin D. Machine Shop Training Course, 5th ed. New York: Industrial Press, 1964, Volume 1, p. 358. v • d • e Metalworking   Machining and computing Computer-aided engineering 2.5D · CAD · CAM · G-code · Numerical control (NC and CNC) · Stewart platform Drilling and threading Die head · Drill · Drill bit · Drill bit shank · Drill bit sizes · Drill and tap size chart · Drilling · Jig borer · Tap and die · Tap wrench · Threading Grinding and lapping Abrasive · Angle grinder · Bench grinder · Coated abrasives · Cylindrical grinder · Diamond plate · Flick grinder · Dresser · Grinding · Grinding machine · Grinding wheel · Jig grinder · Lapping · Sanding · Sharpening stone · Spark testing · Surface grinder · Tool and cutter grinder Machining and milling Electrical discharge machining · Electrochemical machining · Endmill · Engraving · Hobbing · Lathe · Machine tool · Machining · Milling cutter · Milling machine · Planer · Pantograph · Shaper Machine tooling Angle plate · Chuck · Collet · Jig · Fixture · Indexing head · Lathe center · Machine taper · Magnetic base · Mandrel · Rotary table · Wiggler Terminology Chatter · Cutting fluid · Speeds and feeds · Swarf (chips) · Tolerance · Tramp oil Casting · Fabrication · Forming · Jewellery · Machining · Metallurgy · Smithing · Tools and terminology · Welding v • d • e Types of tools Cutting & Abrasive tools Blade · Bolt cutter · Broach · Ceramic tile cutter · Chisel · Coping saw · Countersink · Diamond blade · Diamond tool · Drill bit · Endmill · Emery cloth · File · Fretsaw · Froe · Glass cutter · Grater · Grinding wheel · Hacksaw · Hand saw · Knife · Milling cutter · Miter saw · Nail clipper · Pipecutter · Plane · Rasp · Razor · Reamer · Sandpaper · Saw · Scalpel · Scissors · Steel wool · Surform · Switchblade · Tap and die · Thread restorer · Tool bit · Tumi · Utility knife · Water jet cutter · Wire brush · Wire cutter · Wire stripper Garden tools Adze · Axe · Billhook · Bow saw · Chainsaw · Cultivator · Earth auger · Edger · Garden fork · Garden hose · Garden trowel · Hatchet · Hedge trimmer · Hoe · Hori hori · Irrigation sprinkler · Lawn aerator · Lawn mower · Lawn sweeper · Leaf blower · Loppers · Machete · Mattock · Pickaxe · Pitchfork · Plough (plow) · Post hole digger · Pruning shears (secateurs) · Rake · Roller · Rotary tiller · Scythe · Shovel · Sickle · Slasher · Spade · Splitting maul · String trimmer Hand tools Block plane · BNC inserter/remover · Brace · Bradawl · Breaker bar · Card scraper · Cat's paw · Caulking gun · Clamp · Crimping pliers · Crowbar · Grease gun · Fish tape · Hammer · Hand truck · Hawk · Hex key · Jack · Lug wrench · Locking pliers · Mallet · Mitre box · Monkey wrench · Nut driver · Paint roller · Pipe wrench · Pliers · Punch · Punch down tool · Putty knife · Sink wrench · Ratchet · Scratch awl · Screwdriver · Sledgehammer  · Spike maul  · Staple gun · Stitching awl · Strap wrench · Tire iron · Torque wrench · Trowel · Upholstery hammer · Wrench (spanner) Cleaning tools Broom · Brush · Floor buffer · Hataki · Mop · Pipe cleaner Sponge · Squeegee · Steam mop · Tawashi · Vacuum cleaner Machine tools Broaching machine · Drill press · Gear shaper · Grinding machine · Hobbing machine · Jig borer · Lathe · Metalworking lathe · Milling machine · Planer · Screw machine · Shaper · Turret lathe Measuring & Alignment tools Architect's scale · Beam compass · Caliper · Chalk box · Compass · Engineer's scale · Flexible curve · Jig · Laser level · Laser line level · Laser measuring tool · Micrometer · Pencil · Plumb-bob · Protractor · Ruler · Sliding T bevel · Spirit level · Square · Straightedge · Tape measure Power tools Angle grinder · Bandsaw · Belt sander · Blow torch · Chop saw · Circular saw · Concrete saw · Crusher · Cutting torch · Die grinder · Drill · Glue gun · Grinding machine · Heat gun · Impact wrench · Jigsaw · Jointer · Nail gun · Needlegun scaler · Radial arm saw · Random orbital sander · Reciprocating saw · Rotary tool · Router table · Sander · Scroll saw · Soldering gun · Soldering iron · Steam box · Table saw · Thickness planer · Welding · Wood router · Wood shaper Other Antique tools · Flashlight  · Halligan bar · Kelly tool · Ladder · Toolbox · Vise · Workbench ·