Abstract: A micro-drill includes a first rake face, a first rear face, a second rake face, a second rear face, a first spiral groove extending from a drill point to a tail of the drill, a second spiral groove symmetrically arranged about the first spiral groove, and a biasing groove arranged in front of the drill point. Where the first rake face, the first rear face, the second rake face, and the second rear face are arranged on the drill point. The first spiral groove and the first rake face intersect to form a first cutting edge, and the second spiral groove and the second rake face intersect to form a second cutting edge. The biasing groove and the second rake face intersect to make a length of the second cutting edge be less than a length of the first cutting edge, and the biasing groove and the second spiral groove intersect each other.

Abstract: A locking means for a bit holder fixture for use with grinding apparatus for grinding the hard metal inserts of rock drill bits is provided. The locking means has a macro adjustment for quick positioning of a pressure plate against the body of the bit(s) and a micro adjustment to lock the bit(s) in place by applying pressure against the skirt or shank of the drill bit(s).

Abstract: A hand held, portable drill bit sharpener is provided which may be powered by a standard commercially available electrical power tool. The power tool may be used to actuate the drill bit sharpener by arranging the drive shaft of the sharpener into the power tool chuck. This drive shaft is connected through a gear set to a biased rotating sharpening stone which is pressed against a drill bit tip. The drill bit may be held in the sharpener using a standard keyless drill bit chuck.

Abstract: A drill bit sharpening system using a typical bench grinder with a removable table for refurbishing a dull or broken drill bit has a bench grinder with a motor, a sharpening wheel, and a generally planar positioning table. The system has a generally planar rigid sharpening table with a securing means for rigidly attaching to the positioning table in a removable manner. The system has a pivotally mounted positioning component on the table top surface. The positioning component has a generally “L” shaped cross-section in a transverse plane. The positioning component has a centrally located pivoting means for mounting to a sharpening table top surface.

Abstract: A device for sharpening a twist drill point by means of a rotating grindstone (12) in a grinding machine comprises a base plate (14) lockably articulated around an axis parallel with the axis of the grindstone (12), a drill holder (16) for releasably holding a twist drill (1) to be sharpened, and a guide member (15). The guide member has a back plate (21) and a front plate (22), lockably rotatable in relation to each other. The back plate (21) is connected to the base plate (14) for movements in the direction of the grindstone axis, and the front plate (22) has guide means (28, 29) for slidably guiding the drill holder (16) in the general direction towards and away from the grindstone (12).

Abstract: A device for sharpening a twist drill pointby means of a rotating grindstone (12) in a grinding machine comprises a base plate (14) lockably articulated around an axis parallel with the axis of the grindstone (12), a drill holder (16) for releasably holding a twist drill (1) to be sharpened, and a guide member (15). The guide member has a back plate (21) and a front plate (22), lockably rotatable in relation to each other. The back plate (21) is connected to the base plate (14) for movements in the direction of the grindstone axis, and the front plate (22) has guide means (28, 29) for slidably guiding the drill holder (16) in the general direction towards and away from the grindstone (12).

Abstract: A double-grinding-wheel type drill bit grinding device with a single driving shaft comprising a power source disposed on a base, two grinding wheels being disposed at opposite ends of the single driving shaft extending out of the power source. The grinding device further comprises two pair of first grinding and second grinding seats, each pair of first and second grinding seats being disposed close to the respective grinding wheels at both ends of the driving shaft, a clamping assembly for clamping a drill bit to support the drill bit upon sequential insertion into one pair of the first and second grinding seats, and a positioning device being disposed on a front surface of the base for providing alignment of the drill bit within the clamping assembly prior to the insertion of the drill bit into one pair of the first and second grinding seats. The power source is a pneumatic motor and is provided with a vacuum passage for facilitating dust discharge.

Abstract: A cutter grinding device has a housing, a motor, a grinding wheel, a holding cap, multiple cutter holding brackets and a cutter clamping assembly. The holding cap is mounted on the housing, encloses the grinding wheel and has multiple holes formed on corresponding axis coinciding with different portions of the grinding wheel. The brackets are mounted respectively in the inserting holes in the holding cap and each has a working hole aligning with the corresponding hole in the holding cap and at least one pair of holding blocks. The holding blocks on the holding brackets have different heights to hold fins of a milling cutter at different positions and angles when inserted into the brackets. Accordingly, the milling cutter can be ground at different angles with the cutter grinding device conveniently and easily.

Abstract: A drilling-head-grinding positioning device comprises a clamper for clamping a drilling head having a rectangular sliding rod and a sleeve clamping seat installed at a front end of the sliding rod, a cylindrical clamping device received in the sleeve clamping seat and a nut screwed at a front end of the sleeve clamping seat; and an adjustable seat; and a top of the adjustable seat having a V shape sliding recess corresponding to the periphery of the sliding rod; a bottom of the sliding recess being formed with a receiving trench for receiving a threaded rod; one side of the sliding recess being formed with a communicating groove communicated to the receiving trench; a hook rod being slidably installed in the receiving trench; and a front end of the hook rod being extended upwards with a plate corresponding to a front end of the sliding rod.

Abstract: A drill sharpener is provided which has a point-splitting port which simplifies the procedure for producing a split point on a drill bit undergoing sharpening. The point-splitting port is positioned relative to a grinding wheel assembly such that, when the drill held by a chuck is advanced toward the grinding wheel, a flute of the drill at the drill tip is brought into contact with the grinding wheel. The port has alignment stops therein which mate with flats provided on the barrel of the chuck to ensure proper alignment of the chuck and drill relative to the grinding wheel. The stops also limit the extent of inward travel of the chuck and drill to a predetermined distance. A debris or grit collection tube is also provided to be inserted into an unused port of the drill sharpener, to contain and confine any debris or grit attempting to exit the sharpener through the unused port.

Abstract: Method and apparatus for facilitating sharpening of a tool. A tool holder is provided to present the tool for sharpening against an abrasive member, such as a grinding wheel. A moveable jaw member preferably engages a side of the tool to align the tool with a reference axis. The jaw member preferably supports an alignment finger which moves with the jaw member and which contactingly engages the tool to establish a desired angular orientation of the tool with respect to said axis. The tool preferably includes a flute surface and a cutting edge, and the alignment finger contacts the flute surface adjacent said cutting edge. The alignment finger is further preferably configured so that a distal end thereof is initially adjusted against the abrasive member, such as by a grinding operation, while the alignment member contactingly supports the tool.

Abstract: The present invention provides a multiple station tooling machine for the production of spirally grooved products and includes a base plate, a plurality of work stations distributed around the base plate and operable to effect selected tooling operations on work pieces, a support stand coupled to the base plate and supporting a support plate, and a turntable disposed above the support plate, the turntable being iteratively angularly movable. The multiple station tooling machine also includes a plurality of workpiece retaining elements and an actuating assembly including drive motors mounted on the support plate for moving the workpiece retaining elements to and between selected orientations. A plurality of generally vertical shafts each has a respective workpiece retaining element secured to one end thereof.

Abstract: A portable drill sharpener includes a casing, a sand-wheel, a positioning device, a first grinding unit and a second grinding unit, a holding member for positioning a drill to be ground, a first adjustment unit and a second adjustment unit respectively connected to the first and second grinding units. Each of the first and second adjustment unit includes a guide rail and a sliding frame is movably mounted on the guide rail. The fist and second grinding units have at least one axle along which the first and second grinding units are adjusted.

Abstract: A combined tool for both drilling a hole through a vehicle wheel and deburring the edge of the hole and a method for using the combined tool.

Abstract: An apparatus for clamping a workpiece in a machine. The apparatus comprises an inner nose portion being rotatable about an axis of rotation and comprising a plurality of mounting surfaces, and, an outer ring portion rotatable about the axis of rotation and comprising at least one clamp operable between an unclamped position and a clamped position. In the unclamped position, the inner nose portion is rotationally positionable about the axis relative to the clamp such that a workpiece positioned against the mounting surfaces may be oriented relative to the clamp to a position at which with the clamp being operated to the clamped position, the workpiece is clamped against the mounting surfaces. The clamping results in a coupling of the inner nose portion and the outer ring portion whereby with a clamped workpiece, the inner nose portion and the outer ring portion are rotatable together and are positionable about the axis.

Abstract: A drill bit grinder structure includes: a seat body having a housing, an arched sideboard with a predetermined curvature being disposed on one side of the housing, a slide slot with a predetermined length being formed on the arched sideboard; a fitting member inserted through the slide slot and slidable along the length of the slide slot; and a clamp head fitted through the fitting member. The drill bit grinder structure is characterized by at least a first engaging section disposed on a sidewall of the slide slot and at least a second engaging section disposed in a predetermined position on the circumference of the fitting member corresponding to the first engaging section. The second engaging section can be engaged with the first engaging section to locate the fitting member in a position within the slide slot.

Abstract: A grinding device includes a rotary grinding wheel having an annular grinding surface, a first grinding seat located in front of the grinding wheel, a sleeve disposed rotatably within a through hole in the first grinding seat, an abrasion measuring device for measuring amount of flank portions of a drill bit to be ground, and a tubular holding unit for holding releaseably the drill bit therein. The holding unit is sleeved on the drill bit, is disposed initially in the abrasion measuring device so as to fix position of the drill bit within the holding unit, and is then transferred into the first grinding seat for grinding the flank portions of the drill bit.

Abstract: A precision drill sharpener and grinding wheel assembly is provided, as is a corresponding drill chuck for use with the drill sharpener, in which the drill sharpener includes a lever and spring clip alignment subassembly for properly positioning a drill in the drill chuck, and sharpening ports for sharpening the drill and splitting the drill tip, the sharpening ports being positioned such that a single grinding wheel assembly is used to both sharpen the drill and split the tip. The drill sharpener uses a small diameter grinding wheel operated at high speed to provide cutting rates comparable to large industrial sharpeners. The drill chuck is of short length, relative to most of the drills to be sharpened, and is open at the back end, enabling the manipulation of the drill by its shank relative to the drill chuck when disposed in the alignment subassembly.

Abstract: A grinding control unit installed in a tool bit grinder and adapted to control the feeding of a bit relative to a grinding wheel of a grinding unit of the tool bit grinder, the grinding control unit including a U-shaped support, a chuck adapted to hold the bit to be ground, a feeder adapted to control feeding stroke of the bit a swinging control mechanism adapted to control swinging stroke of the bit when feeding the bit, enabling two lips of the tip of the bit to be ground, a horizontal displacement control mechanism adapted to control the depth of bit feeding stroke, enabling the spur of the bit to be well ground.

Abstract: A drill grinder includes a grinding wheel mounted on a platform for fixed rotation about an axis. A first fixture is provided for properly orienting a drill bit in a chuck or collet. A second fixture is provided for guiding movement of a chuck or collet properly with respect to the grinding surface of the grinding wheel in order to sharpen the end of the drill bit in the chuck. A third fixture is provided for receipt of the chuck or collet with the drill bit properly oriented therein for positioning the bit against a second grinding wheel to effect a point splitting or web thinning operation.

Abstract: The invention is a grinding apparatus for grinding tips of welding electrodes.

Abstract: An adapter for use with a powered grinding tool having a driven grinding wheel has a pivotally mounting part on a body thereof, and a drill bit holder engageable with the mounting part in either of two orientations for sharpening a tip of a drill bit clamped in a set position in the drill bit holder at the grinding wheel, the engagement being completed when the drill bit engages on a stop bar at the front of the mounting part. Also disclosed is a setting arrangement for setting the drill bit in its holder including stop means for engagement by the drill tip upon longitudinal setting of the drill bit, and drill rotation setting means slidable relative to the stop means for rotational setting of the drill bit. A powered grinding tool having the features of the adapter formed as part thereof is also disclosed.

Abstract: A hand-held drill bit sharpening tool includes a hand grip portion adapted to be held in a user's hand and a clamp on the grip portion adapted to hold a drill bit for sharpening the tip on a grinding wheel. The bit is held in the clamp by thumb pressure of the user. A sight on the grip portion allows visual alignment of the tip of the bit for proper sharpening of the cutting edges. The sight is adjustable to accommodate different drill bits. A guard is provided on the tool for protecting the user's hand from the grinding wheel.

Abstract: A process and apparatus for sharpening twist drill bits, for use with a rotary abrasive wheel. The apparatus has a vertical support plate connectable to a standard adjustable base. A cylindrical ring rotatably mounted in the support plate has a radial dovetailed groove on its front face. A sliding plate, with a mounting flange and hole for a chuck on its angled front face, slides in the dovetailed groove of the ring. An angled bar is mounted on the rear face of the ring, to act as an alignment pointer. Both the ring and the sliding plate each have an angled notch cut out of its front face. The two notches are adjacent to each other, and their two opposite edges are aligned when the sliding plate is centered in the ring. In use, the end of a drill bit is placed into the notches, so that the web of the drill bit can be used as a measurement to offset the position of the sliding plate from center.

Abstract: A precision drill sharpener and grinding wheel assembly is provided, as is a corresponding drill chuck for use with the drill sharpener, in which the drill sharpener includes a lever and spring clip alignment subassembly for properly positioning a drill in the drill chuck, and sharpening ports for sharpening the drill and splitting the drill tip, the sharpening ports being positioned such that a single grinding wheel assembly is used to both sharpen the drill and split the tip. The drill sharpener uses a small diameter grinding wheel operated at high speed to provide cutting rates comparable to large industrial sharpeners. The drill chuck is of short length, relative to most of the drills to be sharpened, and is open at a back end, enabling the manipulation of the drill by its shank relative to the drill chuck when disposed in the alignment subassembly.

Abstract: A bit sharpener includes a casing with a front plate having a first tube extending therefrom and a rear plate with a plurality of first holes defined therein, the rear plate having a first tubular member and a first rod centrally extending from an inner side thereof such that a guide plate is mounted to the first tubular member and a grinding member is mounted to the guide plate, a rotating member connected to the grinding member and receiving the first rod therein with two springs disposed between the grinding member, the first rod and an inner side of a front end of the rotating member, the front end of the rotating member having a cone-shaped recess defined in a front side thereof for jaws of a hand drill inserted therein to rotate the rotating member and the grinding member such that when a bit is inserted through the first hole and the vent, the bit is ground by the grinding member.

Abstract: A drill bit grinding machine including a grinding control device controlled to move the drill bit, permitting it to be ground by the grinding wheel, the grinding control device including a mounting base, a coupling block pivoted to the mounting base to hold a bit holder, a side board coupled to the coupling block, a driven gear controlled to turn the bit holder, an axial movement control block controlled to move the bit holder axially, a tilt angle control device controlled to adjust the tilt angle of the bit holder, and a drive gear controlled to turn the driven gear and the tilt angle control device.

Abstract: An adapter (11) is of channel shape, having longitudinal projections (25) at its respective sides for engagement with undercut grooves (24) in a face of a casing of a powered grinding tool (10) with which the adapter is intended to be fitted to sharpened chisels or other planar blades, in use, by means of a grinding wheel (20) of the tool. The adapter has an angularly adjustable guide plate (63) which carrier a slidable plate (70) having magnetic means (71a) for holding an attracted blade of an implement to be sharpened, the angle of the guide plate (63) causing the blade to be correctly sharpened by the wheel (20), in use, as the plate (70) is reciprocated across the wheel with the blade held correctly thereon.

Abstract: An adapter (12) is of channel shape having longitudinal projections (25) at its respective sides for engagement with undercut grooves (24) in a face of a casing of a powered grinding tool (10) with which the adapter is intended to be fitter to sharpen high speed drill fits, in use, by means of a grinding wheel (20) of the tool. The adapter has a rearwardly directed head (76) at its top, the head having a rotatable dial (85) mounted therein which is provided with a multiplicity of differently sized drill bit receiving openings (87), so that, in use, by angularly moving the dial, the opening for a particular size of drill bit can be brought to a location where the drill bit can be inserted in the hole and correctly worked by the grinding wheel, when the adapted is fitted to the tool.

Abstract: An automatic drill loader is used with a drill grinding machine to automatically present drills to the drill grinding machine workhead for being ground thereat and to carry ground drills to a storage receptacle. The automatic drill loader comprises a magazine, a timing station, and two sets of grippers. The magazine stores a quantity of drills, which may have stepped shanks. The magazine is adjustable to suit drills of different lengths and diameters. The magazine presents one drill at a time to a staging station. A load gripper grips the drill at the staging station and conveys it to the timing station, whereat the drill is linearly and angularly oriented. The load gripper then transports the drill to the drill grinding machine workhead. Simultaneously, an unload gripper carries a ground drill from the drill grinding machine workhead to the storage receptacle.

Abstract: An improved drill bit having a shank of larger diameter than the body of the drill has an intermediate section rearward of the point section of the drill of smaller diameter than the point, and a longitudinally elongated, enlarged diameter root section joining the rear end of the intermediate section to the shank. The reduced diameter of the intermediate section provides a clearance space, preventing rubbing of the wall of a hole drilled by the bit, while the enlarged diameter root section increases the resistance of the bit to breaking. An improved method of making the enlarged-root drill bit includes inclining a relieving wheel at a substantially smaller angle to the longitudinal axis of a blank than the angle at which the blank was fluted. In one embodiment having a front tapered tip made by the novel method, rearwardly directed teeth are formed at the rear plane of the drill point, by fluting and relieving steps alone, without requiring an additional machining step.