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Aug. 13, 1968 B. HUTTON 3,396,613 JIG for USE with a MACHINE TOOL Filed Feb

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Aug. 13, 1968 B. HUTTON 3,396,613 JIG for USE with a MACHINE TOOL Filed Feb Aug. 13, 1968 B. HUTTON 3,396,613 JIG FOR USE WITH A MACHINE TOOL Filed Feb. 25, 1966 2. Sheets-Sheet 1 s 424INVENTOR ray2/772-y 2,744 477/2A/A113 Aug. 13, 1968 B. HUTON 3,396,613 JIG FOR USE WITH A MACHINE TOOL Filed Feb. 25, 1966 . 2 Sheets-Sheet 2 INVENTOR. 47/4 - A72/ 24,444 a77.26%A17 3,396,613 United States Patent Office Patented Aug. 13, 1968 2 used are undersized to properly guide the undersize drill. 3,396,613 After the drilling operation, a second and larger drill JG FOR USE WITH A MACHINE TOOL bushing is used to guide the reamer in the finishing of the Billy Hutton, 1594 Paloma, Pasadena, Calif. 91104 hole. Filed Feb. 25, 1966, Ser. No. 529,996 Briefly, this invention provides a new and novel jig for 1 Claim. (C. 77-55) use with a machine tool of a class utilizing a cutting tool which rotates about its longitudinal axis above a table or platform in position to bear on and fabricate a hole in a ABSTRACT OF THE DISCLOSURE workpiece. The jig is in the form of a rigid structure hav The jig has a first and a second end rigidly connected O ing one end adapted to be fixedly and demountably at through a tapered beam. The beam converges from the tached to a stationary portion of the machine tool. The first end to the second end. The first end has a mortise for other or second end of the jig is adapted to be disposed attaching the jig to the tenon of a machine tool such that |Substantially normal to the axis of rotation of the cut the second end depends downwardly and outwardly from ting tool, proximate to the table, and above the work the first end. The second end has a demountable flange in piece. This end has an aperture which, when the jig is which is mounted a drill bushing for guiding the cutting mounted on the machine tool, is aligned with the axis of tool of the machine tool. rotation of the cutting tool in position for the cutting tool to pass through, bear on, and fabricate a hole in the work piece. The aperture is adapted to securely receive a drill 20 bushing which guides the cutting tool. This invention relates to a precision jig for the fabri In preferred form, the present invention comprises a cation of holes in a workpiece by a machine tool utilizing jig with the vertical axis of each of its ends being paral a cutting tool which rotates about its longitudinal axis. lel but spaced apart. Integral with the ends is a midsection In the fabrication of holes in a workpiece severe dimen which depends downwardly and away from the first end sional tolerances are often required. These tolerances to the second end. The mid-section of the jig includes may be in the order of 0.0005 of an inch or better. When geometrically similar upper and lower trapezoidal plates such holes are produced through the use of a machine disposed in generally a parallel relation. These plates are tool, the prior art has generally resorted to either of two connected and spaced apart through the use of two webs. alternatives to support or guide the cutting tool. Guidance Each of the WebS is attached to a corresponding non is necessary to produce the required dimensional toler 30 parallel edge of each of the plates and each is generally ances and is occasioned by such factors as: the misalign normal to the plates. The second or converging end of ment of drills and reamers; surface irregularities in the the jig is a demountably attached flange or fiat plate Workpiece; and, the angle of the workpiece in relation through which there is an aperture. The aperture is de to the cutting tool. These and other conditions have a signed to accommodate a drill bushing which in turn tendency to produce a hole which is oversize and outside guides a cutting tool as it fabricates a hole in a workpiece acceptable dimensional limits. located below the flange. The first end of the jig has a One method heretofore employed to overcome these trapezoidal cavity in the form of a mortise. The mortise and associated problems utilizes as cutting tools a center is sized to fit a standard size ram which is found on many drill, an undersize drill, and a boring bar. The center drill machine tools in the form of a tenon. is secured in the spindle of a machine tool and a center 40 Among the advantages inherent with the jig of this in ing hole is drilled. Because of the rigidity of the center vention is the time required to perform a precision drill drill, its hole serves to properly locate the axis of the ing operation. When mounted on a machine tool, such as finished hole in the workpiece. After the center drill is a mill or a drill press, an operator need merely drill a used, an undersize drill is placed in the spindle of the hole in a workpiece with an undersized drill which is machine and a hole is drilled using the centering hole as guided by a drill bushing mounted in the aperture of the a guide. After the latter hole is drilled, it is brought to its fiange. The hole is finished by inserting a second drill final dimensions through the use of a boring bar carried bushing in the aperture and reaming the hole using the by a boring head which in turn is secured in the spindle. bushing to guide the reamer. Prior art methods, on the However, this finishing step occasions considerable diffi other hand, require as much as ten times as long to per culty because of the nature of the boring bar. These bars 50 form a given precision drilling operation. When using a have a single cutting bit disposed along a lower lateral drilling jig, considerable time was required to fabricate edge of the bar. Often the cutting bit digs into the surface the device and properly mount the workpiece. Similarly, of the hole and forces the bar of center to produce an when using a boring bar, time was wasted for the latter irregularly shaped or oversize hole which in many in method requires: (1) fixing the workpiece in a clamp; stances destroys the workpiece. 5 5 (2) securing a center drill in the machine tool and center A second alternative heretofore employed by the prior drilling the workpiece; (3) removing the center drill; (4) art, when a large volume of similar workpieces is re inserting an undersize drill in the machine tool and drill quired, utilizes a drill fixture or jig. The jig is fabricated ing a hole; (5) removing the drill; (6) inserting a boring to hold the workpiece and to allow for the ingress of a head in the machine tool as well as a boring bar in the cutting tool or tools for the fabrication of the desired 60 boring head; and (7) finishing the hole out to the required holes. After the workpiece is positioned within the jig, the size. In addition, the jig of this invention, by eliminating jig is positioned relative to the cutting tool and the hole the boring bar, eliminates the possibility of over-boring in the workpiece is drilled and reamed out to its final size. with its concomitant loss of time and expense in either To guide the drill and reamer, drill bushings are used. correcting such a fault or in refabricating a new work These bushings are commercially available in many sizes 65 piece. Moreover, in utilizing the jig of this invention, no and are characteristically two types: slip fit drill bushings loss in the accuracy of holes fabricated is encountered and press fit drill bushings. The slip fit drill bushing is because the aforementioned problems associated with the designed to be slipped into a hole in the jig and secured drill and reamer are overcome by guiding these tools with in place by a lock screw mounted on the jig. Because of a drill bushing placed in the aperture of the flange of the the requirement for reaming, the drill bushings originally O 3 3,396,613 4. These and other aspects, advantages and features of this and its corresponding drill bushing are secured in their invention will become more apparent from the following respective positions. The remaining step is then performed description, appended claim, and drawings in which: to finish the hole. FIGURE 1 is a side elevational view, partly in section, While the foregoing description was generally limited of the preferred embodiment of this invention; to the preferred embodiment of the inventive jig and its FIGURE 2 is a view, partly in section, taken along line use with a standard milling machine, the concepts em 2-2 of FIGURE 1; bodied in this invention are equally adaptable to many FIGURE 3 is a view, partly in section, taken along line machine tools which are capable of fabricating holes in a 3-3 of FIGURE 1; and workpiece through the use of a cutting tool which rotates FIGURE 4 depicts the preferred embodiment of this O about its longitudinal axis, for example, a drill press. invention, partly in section, illustrated in FIGURE 1 as it Accordingly, it should be understood that the appended would appear in relaiton to a workpiece and a standard claim is not necessarily limited to the embodiments de milling machine.
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