NationMaster - Encyclopedia: Jig borer

Reasons for development

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: A machine tool is a powered mechanical device, typically used to fabricate metal components of machines by the selective removal of metal. ... Numerical control or numerically controlled (NC) machine tools are machines that are automatically operated by commands that are received by their processing units. ... A CNC Turning Center A CNC Milling Machine The abbreviation CNC stands for Computer Numerical Control, and refers specifically to a computer controller that reads G-code instructions and drives the machine tool. ...

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. A CNC Turning Center A CNC Milling Machine The abbreviation CNC stands for Computer Numerical Control, and refers specifically to a computer controller that reads G-code instructions and drives the machine tool. ... CAD is a TLA that may stand for: Cadiz Railroad (AAR reporting mark CAD) Canadian dollar â€“ ISO 4217-code Capital Adequacy Directive Card Acceptance Device Children of the Anachronistic Dynasty Computer-aided design Computer-aided detection (medical) Computer-aided diagnosis (medical) Computer-assisted dispatch Computer-assisted drafting Coronary artery disease... A cam is a projecting part of a rotating wheel or shaft that strikes a lever at one or more points on its circular path. ...

See also

This article or section is in need of attention from an expert on the subject. ... A lathe is a common tool used in machining. ...

Metalworking:

Drilling and threading: Image File history File links Blacksmith-hammer-anvil-50x50. ... This article or section is in need of attention from an expert on the subject. ...

Die head | Drill | Drill bit | Drill bit shank | Drill bit sizes | Drill and tap size chart | Drilling | Jig borer | Pin chuck | Screw thread | Taps and dies | Tap wrench A die head is a threading die that is used in the high volume production of threaded components. ... A drill is a tool with a rotating drill bit used for drilling holes in various materials. ... Drill bits are cutting tools used to create cylindrical holes. ... The shank is the part of a drill bit grasped by the chuck of a drill. ... Drill bits are the cutting tools of drilling machines. ... Below is a comprehensive drill and tap size chart for all drills, imperial and metric, and taps up to 1 inch. ... An electric drill A drill is a tool with a rotary drill bit used to bore holes through material. ... Two pin chucks. ... Screw thread, used to convert torque into the linear force in the flood gate. ... Taps and dies are metalworking tools for the creation (cutting) of screw threads in metal parts. ... Two Bar tap wrenches and a T style tap wrench A tap wrench is a hand tool used to operate any small tool that has a square driving head as part of its body. ...

Metalworking topics:

Casting | CNC | Cutting tools | Drilling and threading | Fabrication | Finishing | Grinding | Jewellery | Lathe (tool) | Machining | Machine tooling | Measuring | Metalworking | Hand tools | Metallurgy | Milling | Occupations | Press tools | Smithing | Terminology | Welding This article or section is in need of attention from an expert on the subject. ... Casting is a process by which a fluid melt is introduced into a mold, allowed to cool in the shape of the form, and then ejected to make a fabricated part or casing. ... A CNC Turning Center A CNC Milling Machine The abbreviation CNC stands for Computer Numerical Control, and refers specifically to a computer controller that reads G-code instructions and drives the machine tool. ... a Cutting Tool, in the context of Metalworking is any tool that is used to remove metal from the workpiece by means of shear deformation. ... Drilling is the process of using a drill bit in a drill to produce holes. ... A typical steel fabrication shop Fabrication is an industrial term generally applied to the building of metal machines and structures. ... Metalworking finishing is the activity of making things out of metal in a skillful manner. ... Rotating abrasive wheel on a bench grinder. ... Jewellery (jewelry in American English) is literally any piece of fine material used to adorn oneself. ... Conventional metalworking lathe In woodturning, metalworking, metal spinning, and glassworking, a lathe is a machine tool which spins a block of material so that when abrasive, cutting, or deformation tools are applied to the block, it can be shaped to produce an object which has rotational symmetry about an axis... A lathe is a common tool used in machining. ... A machine tool is a powered mechanical device, typically used to fabricate metal components of machines by the selective removal of metal. ... The examples and perspective in this article or section may not represent a worldwide view. ... This article or section is in need of attention from an expert on the subject. ... Metalworking hand tools are hand tools that are used in the metalworking field. ... Metallurgy is a domain of materials science and of materials engineering that studies the physical and chemical behavior of metallic elements, their intermetallic compounds, and their mixtures, which are called alloys. ... Cutters for a milling machine. ... It has been suggested that this article or section be merged with Smith (metalwork). ... Power press with a fixed barrier guard A press, or a machine press is a tool used to work metal (typically steel) by changing its shape and internal structure. ... A smith or metalsmith is a person involved in the shaping of metal objects. ... This article needs to be wikified. ... Welding is a fabrication process that joins materials, usually metals or thermoplastics, by causing coalescence. ...

Categories: Drilling and threading | Machining | Tools

Contents

Reasons for development

References

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See also