Abstract: The burr formed on the breakout side of a workpiece during a drilling operation is removed by a deburring bit positioned underneath the workpiece in axial alignment with the drill bit. The drill bit is of the twist type and has at least two longitudinal flutes joined by a web and separated by an equal number of longitudinal lands. The deburring bit has a number of radially extending cutting elements which project radially outwardly from adjacent the bottom of each flute to substantially beyond the diameter of the hole. At the bottom of the flutes, the radially extending cutting elements are spaced to pass the web of the drill bit axially therebetween and to engage the flutes when the drill bit is rotated.

Abstract: A miter box and frame doweling drill jig apparatus utilizes a miter box having the two side walls thereof chamfered at a 45 degree angle relative to the base portion thereof. A plate having a plurality of drill fit aligning holes is removeably affixed at various locations on the chamfered ends of the side walls. A mitered work piece clamped to either side wall may be drilled, utilizing a drill bit aligned in selected holes thereby permitting work pieces to be easily assembled into a picture frame employing dowels therefor.

Abstract: The present invention relates to a dowel hole boring guide for precision boring of dowel holes in ends and abutting surfaces of workpieces and is composed of a boring support incorporating a plurality of appropriately sized and spatially related tool guide openings and which support is hingedly connected to a workpiece clamping means with parallel clamping surfaces and wherein the rotational axis of the hinge is perpendicular to the clamping surfaces.

Abstract: An apparatus for cutting a hole through the sidewall of a longitudinally extending pipe is disclosed herein. This apparatus includes a cylinder saw, i.e., a hole saw and a portable jig for supporting and guiding the saw during the hole cutting operation.

Abstract: A doweling jig requiring minimal adjustment for drilling multiple like-size mating dowel pin holes in workpieces of varying thicknesses, dependent on the configuration of fixed position drill guides or bushings. The jig is generally of channel construction, with reversible clamping for use on double jigs of one or two channels. Each side of a double jig may differ in configuration and size of its fixed position drill guides. Of the many construction methods, two use interchangeable heads containing one or more drill guide configurations. The use of pivotal stop disks at each end of the channel lessens visual alignment.

Abstract: A drill jig for producing a rectangular mortise in the flat surface of a workpiece requiring only a portable drill and drill bit. The rectangular slot is intended to snugly house a standard square or hex nut so as to keep it from turning in either direction. The jig also permits production of a pilot hole perpendicular to the mortised slot for receiving the threaded end of a bolt for mating with the embedded nut. The drill jig in a preferred embodiment includes a pair of substantially identical drill guide members, an anvil plate, and a stationary support, all of which are movably disposed on a vertical support member. The workpiece is clamped between the lower drill guide plate and the anvil plate. Each of the drill guide plates includes a channel-shaped member having the desired slot templates formed therein, and a movable template disposed therewithin.

Abstract: A universal mounting portable electric drill angle drilling attachment comprising a base, angularly adjustable spring return upright, angle indicia, and drill clamping means.

Abstract: A mechanized contour-following drill machine for drilling and reaming holes in a contoured surface. The machine orienting a drill spindle of a drill assembly perpendicular to a plane tangent to the contoured surface of a work piece so that the center line of the holes drilled therein are perpendicular to the contoured surface.

Abstract: A boring jig is provided having at least one drill bit guidance hole and having two clamps for holding the work. Provision is made for passing the drill bit through the guidance hole in one direction to drill a first work piece held under one clamp, then consecutively to pass the drill through the same guidance hole in the opposite direction to drill a mirror-image hole in a second work piece held under the other clamp.

Abstract: A device for supporting piano hammers for drilling a stem supporting opening therethrough which includes adjusting elements that serve to selectively locate the hammer supporting portion of the device in a preselected position to effect drilling an opening which will extend through the longitudinal axis of a piano hammer and at any desired angle relative to a plane normal with this axis.

Abstract: A template holder for clamping a template to a workpiece including a pair of parallel rods mounted one above the other on a spacer block, the upper rod is connected to a template. The lower rod is pivotably connected to the spacer block and is connected to a backing block spaced from the template. The template is positioned on a workpiece and the backing block pivoted to a position beneath the template and work pieces to clamp the workpiece between the template and backing block. With the template locked in place, it is used to mark, cut, or in the drilling of the workpiece.

Abstract: A disposable drill bit guide for optically guiding a drill bit in a manner normal to a workpiece, and having, a sheet of relatively thin disposable material said sheet having a reflective surface for providing a reflective image of a drill bit, adhesive means on said sheet for adhesively fastening same on a workpiece with said reflective surface exposed to view, and visible guide lines on said sheet, said guide lines intersecting one another at right angles, whereby a drill bit may be centered on such intersection and its image viewed in said reflective surface, and checked with reference to said guide lines.

Abstract: An apparatus for supporting a power driven drill for drilling holes in a workpiece, such as a beam and the like, is disclosed which includes a support frame having clamping members for fixedly securing the frame to the workpiece, and having drill support and guide means operative to stabilize and guide the drill as it is fed into the workpiece by means of a manual power screw.

Abstract: This disclosure relates to a device for centering a V-block relative to a tool which is to perform a machining operation on a workpiece to be mounted in the V-block. The center finder is in the form of a block contoured to seat in the V-block and having formed in the upper surface thereof grooves of a width corresponding to various machine tool widths so as to effect the centering of the center finder block relative to the tool which, in turn, automatically centers the V-block relative to the tool.

Abstract: A clamp, useful in mounting a drill jig having a base plate with drill guides on a ski for boring holes for bindings, comprising a pair of jaws having face portions and mountable on the base plate, the jaws being moveable with respect to the base plate and the face portions opposing each other, means for biasing the jaws toward a first closed position, and manually operable means for overcoming the biasing means to move the jaws to a second open position. In a preferred embodiment the jaws have rack portions engageable with a pinion rotatable with the manually operable means, at least one of the faces has an adjustable stop for centering the jig on the ski, and a torsion spring contained within the manually operable means provides the biasing means.