Abstract: A sanding tool includes a machine body, a power supply, a base plate assembly, a drive mechanism, and a control mechanism. The machine body includes a casing. The base plate assembly includes a base plate. The drive mechanism is disposed in the casing and includes a motor and an output shaft, the motor has a motor shaft rotating around a first axis, the output shaft rotates around a second axis, and the output shaft transmits power to the base plate assembly. The control mechanism is electrically connected to the motor and configured to control the sanding tool to operate. The first axis and the second axis form an included angle and are not in the same plane. A battery pack and the motor are disposed on two sides of the output shaft.

Abstract: An actuator for motor vehicle applications, in particular for motor vehicle closing devices, comprising an electric motor, an actuating element which can be directly or indirectly acted upon via a drive train, and, arranged on a drive shaft of the electric motor, a drive wheel with an evoloid toothing, the drive train having at least one crown gear stage.

Abstract: In a bevel gear pair, a first gear and a second gear are applied with tooth top modification, and a ratio of a distance from a pitch circle to a starting position of the tooth top modification to a distance from the pitch circle to a tooth top in the first gear is larger than a ratio of a distance from a pitch circle to a starting position of the tooth top modification to a distance from a pitch circle to a tooth top in the second gear. Thus, the bevel gear pair that can achieve smooth meshing is provided.

Abstract: A gearwheel includes a gearwheel body with teeth arranged around its rotational axis. Two adjacent teeth are connected to one another at their tooth roots via a tooth base. The gearwheel includes a supporting structure which has a supporting region at least one or both axial ends of the respective tooth base, which supporting region extends away from the tooth base between the respective adjacent teeth. The supporting regions are connected directly to the adjacent teeth and the tooth base in each case by way of a transition region. The respective transition region surrounds the supporting region in a manner which extends at least partially and contiguously and has a transition geometry in cross section as viewed in the direction of its extent. A geometric variable of the said transition geometry changes steadily, depending on the supporting region, along an axial and/or radial direction with regard to the rotational axis.

Abstract: A piece type ball screw in a screw shaft with a spiral external thread groove on an outer peripheral surface, a nut which is fitted onto the screw shaft and has a spiral internal thread groove on an inner peripheral surface, a plurality of balls rotatably arranged in a track path formed between the external thread groove and the internal thread groove, and a piece member which is attached to the nut and connects the internal thread grooves to each other. The piece member includes a piece body in which a return groove connecting the internal thread grooves is formed and a pair of engaging portions which are provided on the piece body, extend in opposite directions in a circumferential direction of the nut, and engage with the internal thread groove of the nut. A joint portion between the piece body and the engaging portion has a fillet shape.

Abstract: A tooth contact position adjustment amount estimation device that performs processing with respect to estimating a tooth contact position adjustment amount for dimensional data of parts constituting a power transmission mechanism according to the present invention, comprising: a machine learning device that performs processing with respect to estimating the tooth contact position adjustment amount for the dimensional data of parts constituting the power transmission mechanism, wherein the machine learning device observes part dimensional data, which is the dimensional data of parts constituting the power transmission mechanism, as a state variable indicating a current state of an environment, and performs processing with respect to estimating the tooth contact position adjustment amount for the dimensional data of parts constituting the power transmission mechanism in assembling the power transmission mechanism by performing processing with respect to machine learning based on the observed state variable.

Abstract: A drive gear and a driven gear meshing therewith are provided. The driven gear has a plurality of areas that provide driving loads variable with a rotational angle. Tooth widths of tooth portions included in the plurality of areas are set different from each other.

Abstract: A degree of freedom of a hypoid gear is improved. An instantaneous axis in a relative rotation of a gear axis and a pinion axis, a line of centers, an intersection between the instantaneous axis and the line of centers, and an inclination angle of the instantaneous axis with respect to the rotation axis of the gear are calculated based on a shaft angle, an offset, and a gear ratio of a hypoid gear. Based on these variables, base coordinate systems are determined, and the specifications are calculated using these coordinate systems. For the spiral angles, pitch cone angles, and reference circle radii of the gear and pinion, one of the values for the gear and the pinion is set and a design reference point is calculated. Based on the design reference point and a contact normal of the gear, specifications are calculated. The pitch cone angle of the gear or the pinion can be freely selected.

Abstract: A gearing is described as having a pinion and a wheel, the wheel having two toothing regions which are set apart from each other, in particular on one of its end faces, the toothing of the pinion meshing with the toothing regions, the toothing in particular being continuous, i.e., uninterrupted throughout, the pinion axis being perpendicular to and set apart from the wheel axis.

Abstract: One or more specific versions disclosed herein includes a power tong for rotating tubulars in wellbore operations, including: an upper tong plate, a lower tong plate, a gear train disposed between the upper tong plate and the lower tong plate; and a strut removably coupled to the lower tong plate, the upper tong plate, or both.

Abstract: Bevel gear having a main body comprises a heel-side skin surface. The bevel gear has at least one tooth gap, which exits from the main body in the region of the skin surface. The tooth gap has a tooth base, the profile of which is defined by a base cone angle in relation to the workpiece axis of rotation. A concentric circumferential ring structure is provided on the skin surface, which is raised in relation to the skin surface, and which results in a heel-side exit angle between the tooth base and the ring structure, which is in the range between 125° and 160°.

Abstract: The invention relates to a bevel gear wheel (1) of a bevel gear unit, each tooth (2) of which comprises a load flank (3) and a non-working flank (4), wherein the teeth (2) have a helical or spiral tooth trace, in particular a curved tooth longitudinal line, and the teeth (2), in particular the upper meshing region of the teeth, have an octoid tooth shape or a spherical involute tooth shape, and the teeth have an excess material quantity (11) on the load flanks (4) in order to reinforce the load flanks (4), in particular such that the axis (9) that runs through the tooth tip-bisecting point A1 of the tooth tip transverse line (23) and through the midpoint of the gear wheel exhibits asymmetry of the teeth (2). The invention further relates to a method for producing a bevel gear wheel (1) according to one of the preceding claims, in which the tooth geometry is produced by a four-axis or multi-axis method, in particular a five-axis method.

Abstract: A parking brake for a railway vehicle includes a pneumatic cylinder having a cylinder wall, a first wall opposite a second wall, and a piston movable within the pneumatic cylinder. At least one spring extends between the piston and the second wall for biasing the piston against the first wall. A gear box is fixed relative to the second wall and includes a hand wheel. A spindle is operatively connected to the gear box to affect movement of a manual reset mechanism having a threaded shaft and a ball screw nut rotatably engaged with the threaded shaft. A pushrod is connected to the manual reset mechanism and extends through the cylinder and the first wall. When the hand wheel is rotated, the manual reset mechanism is rotated to cause the pushrod to move relative to the piston corresponding to the direction of the rotation of the hand wheel.

Abstract: A bevel gear drive with two bevel gears rotates about respective rotation axes intersecting at an intersection point, forming an angle of intersection. A computer determines the tooth shape of these tooth flanks based on data other than a tooth shape. The data are characteristic for a particular contact path represented by a sequence of contact points. The tooth shape of the tooth flanks is determined for several contact paths, with the interacting tooth flanks at all contact points having a common normal, which passes through a pitch point located between the two rotation axes and spaced from the intersection point equal to the radius r. Geometry data for the bevel gear are determined from the shape of the tooth flanks and stored in a format suitable for automatically generating a parts program for a processing machine with at least five axes.

Abstract: A method of determining an optimized face cone element for spiral bevel and hypoid gears. The form of the root fillet of one member of a gear pair is determined and that from is transferred to the tip of the other member of the gear pair. With the inventive method, tooth root-tip clearance is optimized and the contact ratio is maximized while avoiding root-tip interference between mating gear members.

Abstract: A double involute pinion-face gear drive provides transmission of torque and speed, or direction of movement modification between non-intersecting shafts at right angles to one another. A double involute cylindrical pinion on one axis, engages a rotatable disk-shaped gear on the second axis. The teeth of the pinion are curved in an abridged, normal or extended involute shape. Likewise, the teeth of the face gear are curved in abridged, normal or extended involute shape in the lengthwise direction of the teeth. These gear drives can be simultaneously bi-rotational and bi-directional and allow a relatively wide range of speed ratios, as low as 1:1 and as high as 7.5:1.

Abstract: A gear set is provided for use in a gearbox. The gear set includes a first bevel gear having a first rotational axis and a second bevel gear having a second rotational axis. The second gear is driven by the first gear. The first gear has an outside diameter of about 3.1956 inches, an outer cone distance of about 2.1044 inches, a face width of about 0.62 inches, and a ratio of the outside diameter to a length parallel to the axis of rotation between the crown and the pitch apex of about 1.83. The second gear has an outside diameter of about 2.8337 inches, an outer cone distance of about 2.1044 inches, a face width of about 0.62 inches, and a ratio of the outside diameter to a length parallel to the axis of rotation between the crown and the pitch apex of about 2.33.

Abstract: A gear pair set comprising low shaft angle and offset bevel gears and a method for their manufacture including determination of the appropriate gear and pinion blanks and the basic machine settings for their manufacture. The pair of bevel gears comprises a first member and a second member wherein the members of the pair have a shaft angle in the range of greater than 0° to 30°, preferably greater than 0° to 20°, and have an offset in the range of greater than zero to the sum of half the mean pitch diameters of the two members of the bevel gear pair.

Abstract: A gear set is provided for use in a gearbox. The gear set includes a first bevel gear having a first rotational axis and a second bevel gear having a second rotational axis. The second gear is driven by the first gear. The first gear has an outside diameter of about 3.1956 inches, an outer cone distance of about 2.1044 inches, a face width of about 0.62 inches, and a ratio of the outside diameter to a length parallel to the axis of rotation between the crown and the pitch apex of about 1.83. The second gear has an outside diameter of about 2.8337 inches, an outer cone distance of about 2.1044 inches, a face width of about 0.62 inches, and a ratio of the outside diameter to a length parallel to the axis of rotation between the crown and the pitch apex of about 2.33.

Abstract: A gear pair includes a small-diameter conical involute gear having a conical angle, and a large-diameter conical involute gear having a conical angle. The small-diameter conical involute gear and the large-diameter conical involute gear are constituted by an aggregate of imaginary cylindrical gears.

Abstract: A method of deriving a path of contact of a face gear with a pinion gear includes positioning the pinion gear, shifting the pinion gear from either towards or away from the face gear along a rotational axis, deriving a first relationship between a rotational angle of the pinion gear and a fluctuation error angle, deriving second and third relationship by shifting the first relationship in either way for 360 degree divided by the number of the gear teeth, deriving a first point which the first and second relationships share and a second point which the first and third relationships share, deriving a third point, at which the fluctuation error is the same as the first and second points, between the first and second points, and determining a curve line on tooth flanks of the gear teeth on the basis of the first, second, and third points.

Abstract: Mating bevel gears generally include a pinion gear having a body that rotates about an axis and a side gear having a body that rotates about an axis that intersects the axis of the pinion gear. Pinion gear teeth of the pinion gear have a side that defines a curvature with an involute section through which a pitch line extends and a parabolic shape between the pinion gear teeth. Side gear teeth of the side gear have a side that defines a curvature with an involute section through which a pitch line extends and a parabolic shape between the side gear teeth. The curvatures on the pinion and the side gear teeth cooperatively define a controlled relative radius of curvature section except where the involute sections are located. The controlled relative radius of curvature section defines a sum of values of radius of curvature at a point of contact between the curvatures of the pinion gear teeth and the side gear teeth. The sum has a constant or decreasing value.

Abstract: A fluctuating gear ratio limited slip differential assembly is provided that includes a differential case and a pair of side gears disposed within the differential case. Each of the side gears may have a tooth with a first tooth flank. The differential assembly may further include a pinion shaft disposed within the differential case and a plurality of pinions supported by the pinion shaft. The pinions may be configured for engagement with the pair of side gears and each of the pinions may have a tooth with a second tooth flank. The first and second tooth flanks are configured to cause movement of the plane of action defining all contact points between the first tooth flank of the side gears and the second tooth flank of the pinions in a predetermined and/or controlled manner.

Abstract: In a spiral bevel gear, a contact area between tooth flanks that mesh with each other is increased, thereby reducing teeth knocking noise and strengthening tooth sections. A shape of a tooth form on a normal plane T of a tooth section 15 of a spiral bevel gear becomes gradually larger as the normal plane moves from a small-diameter end section side towards a large-diameter end section side along a tooth trace H, as indicated by (a), (b), and (c). In correspondence, a tooth crest arc section S is provided in a connecting section 21 between a tooth flank 17 on a meshing side and a tooth crest 16. The tooth crest arc section S is formed such that a curvature radius r gradually increases within a range that does not exceed a radius R of an inscribed circle inscribed within two tooth flanks 17 and 18 and the tooth crest 16 on the normal plane T. The tooth crest arc section S can increase contact area when contact is made with a tooth flank of a partner gear and elastic deformation occurs.

Abstract: In a resin double-helical gear formed by injection-molding, smooth meshing of teeth can be performed for rotation of the resin double-helical gear in both directions, and occurrences of thrust-direction load and noise can be prevented. Peak-side tooth flanks 7c and 7d and valley-side tooth flanks 7e and 7f of a tooth 7 in a resin double-helical gear 1 are formed such as to become farther away from peak-side tooth flanks 9c and 9d and valley-side tooth flanks 9e and 9f of a standard tooth 9 in an inward direction, the closer the peak-side tooth flanks 7c and 7d and the valley-side tooth flanks 7e and 7f are to a tooth width direction center section 3 from one tooth width direction end section 4a and another tooth width direction end section 4b. As a result, meshing escape sections g (g1 and g2) and h (h1 and h2) having dimensions in a tooth thickness direction that increase towards the tooth width direction center section 3 are formed on the peak-side tooth flank side and the valley-side tooth flank side.

Abstract: The present invention is directed to a modular spinning apparatus adapted for the centrifugal separation of components in a biological sample. In one embodiment, the modular spinning apparatus comprises several non-lubricated elements which are designed and adapted for manual assembly within a sterile operating room. The elements comprise a lubrication free gearbox with a non-lubricated gear system therein, a rotatable riser shaft engaged with the gear system and a riser head fixedly engaged with the rotatable riser shaft.

Abstract: Bevel and hypoid gears are used in power transmissions including automotive applications. Provided is a net shaped bevel or hypoid gear having a generally annular gear body including a plurality of radially outwardly extending gear teeth formed from a generally annular blank made of powdered metal. Also provided is a method for manufacturing a net shaped bevel or hypoid gear including the steps of providing and optionally heat treating a generally ring-shaped or annular blank made of metal powder, then incrementally deforming the blank by orbitally forming or roll forming to produce a net shaped gear member with a plurality of outwardly extending gear teeth, which may be of a bevel or hypoid type.

Abstract: A gear and a method of making a forged powder metal gear having a plurality of teeth and a variable case depth profile forged in the plurality of teeth. Each tooth of the plurality of teeth has a first surface and a tooth root. A variable case depth profile is formed in each tooth of the plurality of teeth, whereby the variable case depth profile exhibits greater tooth wear resistance on the first surface and greater impact resistance in the tooth root.

Abstract: A webbed spiral bevel gear formed by cold forging includes: gear teeth formed at a peripheral surface of the gear basis to be integral therewith. Each gear tooth includes a tooth top land and a tooth bottom land both in a slanting and curved manner relative to a center axis of the gear basis. The webbed spiral bevel gear includes a web portion formed at radially outer end portions of the gear teeth to be integral therewith and closing the tooth bottom lands at the radially outer end portions of the gear teeth. The web portion is continuous with the radially outer end portions of the tooth top lands. A profile of the radially outer end portion of the tooth top land of each gear tooth has two edges extending at a slant from each other and expanding in a direction of the web portion.

Abstract: Provided is a power transmission device with a bevel gear for supporting a bevel gear or a shaft with the bevel gear through a bearing. The bearing solely has a structure in which its rolling elements support without play a thrust load in both directions of the bevel gear or the shaft with the bevel gear. A pitch circle of each of the rolling elements may be located on the outside of an inner end of a tooth of the bevel gear in the radial direction.

Abstract: In a spiral bevel gear, a contact area between tooth flanks that mesh with each other is increased, thereby reducing teeth knocking noise and strengthening tooth sections. A shape of a tooth form on a normal plane T of a tooth section 15 of a spiral bevel gear becomes gradually larger as the normal plane moves from a small-diameter end section side towards a large-diameter end section side along a tooth trace H, as indicated by (a), (b), and (c). In correspondence, a tooth crest arc section S is provided in a connecting section 21 between a tooth flank 17 on a meshing side and a tooth crest 16. The tooth crest arc section S is formed such that a curvature radius r gradually increases within a range that does not exceed a radius R of an inscribed circle inscribed within two tooth flanks 17 and 18 and the tooth crest 16 on the normal plane T. The tooth crest arc section S can increase contact area when contact is made with a tooth flank of a partner gear and elastic deformation occurs.

Abstract: A resin-made gearing apparatus that includes a configuration in which only one tooth flank side of each tooth in one of a pair of gears is provided with an overhang section that is disposed on at least one end portion in a tooth width direction, and overhangs diagonally from the one tooth flank side toward the adjacent tooth side; an end portion in a tooth width direction of each tooth in the other gear is provided with a lightening section that is disposed in a tooth flank of each tooth on an end face on the side of the end portion corresponding to the overhang section of the one gear, so that when the opposite teeth of the pair of gears are meshed with each other, the overhang section of the one gear is elastically deformed and also the lightening section of the other gear is elastically deformed, to absorb a backlash.

Abstract: The invention relates to a toothed wheel of a gear drive, particularly for electric hand machine tools, comprising a toothing and a damping element made of an elastic material, the element being disposed in a recess of the toothed wheel. The object of the invention is to improve the effectiveness and the operational safety of the damping element on a toothed wheel with little effort in order to increase the service life of the gear drive. The task is solved by the toothed wheel (1) having a recess (5) penetrating the toothing (2).

Abstract: An injection-molded resin bevel gear having high accuracy and high rigidity that can meet demands of the precision-instrument industry and the like through design of a gear structure can be provided. A rim-shaped section 13 of a teeth section 5 has almost the same thickness among a bottomland 14 and has almost the same thickness as that of a web 4. An outward-radial-direction end of the web 4 is connected to an inner end 6a side of the rim-shaped section 13. In the rim-shaped section 13, a section from a teeth section connecting section 12 of the web 4 to the vicinity of an outer end 6b side is connected to an outer circumferential surface of the boss 3 by a plurality of first radial direction ribs 16. In the rim-shaped section 13, a section from the teeth section connecting section 12 of the web 4 to the vicinity of a tooth-width-direction center section 10 is connected to an outward-radial-direction end of second radial direction ribs 20.

Abstract: A webbed spiral bevel gear formed by cold forging includes: gear teeth formed at a peripheral surface of the gear basis to be integral therewith. Each gear tooth includes a tooth top land and a tooth bottom land both in a slanting and curved manner relative to a center axis of the gear basis. The webbed spiral bevel gear includes a web portion formed at radially outer end portions of the gear teeth to be integral therewith and closing the tooth bottom lands at the radially outer end portions of the gear teeth. The web portion is continuous with the radially outer end portions of the tooth top lands. A profile of the radially outer end portion of the tooth top land of each gear tooth has two edges extending at a slant from each other and expanding in a direction of the web portion.

Abstract: An electric power steering apparatus comprises a steering assisting electric motor having an output shaft and a speed reduction mechanism. The speed reduction mechanism includes conical first and second gears to be engaged with each other. The first and second gears include a plurality of teeth each having a tooth surface. The mutually corresponding tooth surfaces of the first and second gears each include engaging regions to be engaged with each other. A center position in a tooth width direction of the engaging region of each tooth surface of the first gear in an unloaded state is offset by a first offset amount from center position in the tooth width direction of the tooth surface of the first gear to a relatively small end portion of the tooth of the first gear.

Abstract: An idler gear having a part worked by cutting is formed such that a chamfer part is formed at least on a portion between a tooth shape and chamfers are formed on the tooth shape by a forging process on an outer peripheral surface and an end part thereof in an axial direction by cutting.

Abstract: A ring gear includes teeth (10) and tooth gaps (12), in which the teeth (10) can be brought vie tooth flanks (14) into engagement with a corresponding pinion. The tooth flanks (14), after a final engagement point (16) of the pinion, from the tooth head (18) toward the tooth base (20), compared to standard tooth flanks (22), are made to approximate a trochoid (24, 26), described by the pinion and projected into a normal section.

Abstract: A crown gear assembly including a crown gear which is rotatably supported around a first axis (A1) and which forms teeth (13) which are provided with flanks (14, 15) whose mantle lines extend substantially radially relative to the axis (A1), as well as a pinion (21) which is rotatably supported around a second axis (A2) extending perpendicularly relative to the first axis (A1), and which forms teeth (23) which are provided with flanks whose mantle lines extend substantially parallel relative to the axis (A2), wherein, on the radial outside of the teeth (13) of the crown gear, the pinion (21) is provided with a collar (25) which is adapted to contact a circumferential face of the crown gear (11).

Abstract: A gear system which includes a pinion and mating-gear forming a gear pair with a predetermined gear ratio (mG), center distance (C), face-width (Fw), and limiting stresses. The pinion has a pinion tooth number (N1) and a first plurality of teeth, each tooth having a first-tooth profile. The mating gear has a mating-gear tooth number (N2) satisfying the expression N2=mG·N1 and a second plurality of teeth, each tooth having a second-tooth profile. The relative curvature of the first-tooth profile and the second-tooth profile is given by the expression kc·Fc, where Fc is a relative reference curvature function given by the expression Fc=(N1+N2)2/(N1·N2·C), and kc is a relative curvature multiplier which is a function of the gear ratio (mG), the center distance (C), the face-width (Fw), and the limiting stresses.

Abstract: A bevel gear 1 has a radius of curvature R of a fillet curve provided between a tooth flank A and a bottom land B gradually increasing from a small-diameter end D1 to a large-diameter end D2.

Abstract: An inspection apparatus (40) for remote inspection of the trepan radius area (34) of the inlet sleeve (24) of a steam turbine (10). The apparatus (40) provides a sealed volume (50) between a pair of inflatable bladders (46,48) for the introduction of a liquid couplant for the immersion of ultrasonic transducers (42,44). A laser line generator (62) generates a beam of light visible through camera (60) which impinges upon the inlet bell seal (30) when the apparatus (40) is in a proper inspection position within the inlet sleeve (24). Guide vanes (56) provide centering and generate an insertion force during air assisted insertion of apparatus (40). Transducers (42,44) are indexed axially and circumfretially by the independent rotation of axial drive gear (72) and longitudinal drive gear (70) engaged with a pattern of gear teeth (69) formed as a combination of circumferential spur gear teeth and axial rack gear teeth cut into a single surface of a spline shaft (68).

Abstract: In a bevel gear pair including a first gear having a plurality of first gear teeth, each defined at least in part by a tooth route and concave and convex flank surfaces, the concave and convex flank surfaces each define a first surface structure formed by grinding. This first surface structure is in turn defined by a plurality of microstriations extending diagonally across the convex and concave flank surfaces. A second gear also includes a plurality of gear teeth adapted to mesh with the gear teeth of the first gear. Each of the second gear teeth is also defined in part by a tooth route and concave and convex flank surfaces. The concave and convex flank surfaces of the second gear define a second surface structure formed by grinding followed by honing. This second surface structure includes a plurality of microstriations; however, unlike the microstriations of the first surface structure, these are parallel to the route of each of the second gear teeth.

Abstract: A bevel gear 1 has a radius of curvature R of a fillet curve provided between a tooth flank A and a bottom land B gradually increasing from a small-diameter end D1 to a large-diameter end D2.

Abstract: Several embodiments of various non-involute gear tooth profiles incorporate relief areas formed across the area of the tooth face generally symmetrically to each side of the pitch circle of the gear. The relief area serves to preclude contact across the areas of meshing or mating gear teeth where convex-to-convex contact would otherwise occur, thus precluding high pressure contact between the two gear teeth at the area of the relief. The remainder of the contact of such non-involute gear tooth profiles provides conformal contact, i. e., convex-to-concave mating faces with correspondingly low pressures developed between the tooth portions. The present invention enables a given gear set to absorb considerably greater torque and force than would otherwise be they case, or alternatively allows gear sets to be made considerably smaller and lighter for a given torque transmission, than would otherwise be the case.

Abstract: A power tong gear train which includes a ring gear having a series of teeth and a roller surface. The gear train further includes an idler gear assembly having a series of teeth and a roller element fixed thereto. The idler gear assembly is positioned such that the roller element engages the roller surface and maintains the tangential orientation of the two gears' respective pitch diameters.

Abstract: A method for designing root area geometry of a straight bevel gear providing reduced stress concentration and increased tooth strength. Also, a method for making a forging die for manufacturing gears having improved tooth root geometry. The method includes the steps of designing the straight bevel gear having improved root area geometry, designing an electrode for an electric discharge machining using CAD/CAM device, manufacturing the electrode, and manufacturing the forging die employing the electric discharge machining process.

Abstract: In order to prevent balls 3 from, when the balls 3 are discharged from a nut 102 in accordance with relative axial movement of the nut 102 and a screw shaft 1, contacting with thread grooves 102a and 1a of the nut 102 and the screw shaft 1 at three points, a counterbore 102c is formed around the thread groove 102a of the nut 102 in the vicinity of a discharge port for the balls 3 in the nut 102. When the balls 3 are contacted with the thread grooves 102a and 1a, therefore, a four-point contact is always maintained. Consequently, reaction forces which are applied from the thread grooves 102a and 1a to the balls 3 balance with each other, whereby stable holding of the balls 3 is ensured.