Abstract: An apparatus in the form of an adapter for forming a connection comprising a first part adapted for coupling with a second part by a quick-release coupling formed by a first projection of the first part having an at least partial dovetail shape and a recess of the second part having an at least partial dovetail shape. An opening in the recess is adapted for receiving the projection in an axial direction. In other embodiments, the adapter is: (1) frictionally enhanced for engaging an internal portion of the drilling element; (2) includes a radial projection elongated in an axial direction for engaging the internal portion of the one drilling element; and/or (3) has a cutter for scoring an internal portion of the one drilling element upon being inserted therein and rotated. An adapter is also disclosed for use with a drill chuck, including for creating a “twist lock” connection.

Abstract: A system for securing different first and second drill tools to a drill head including a socket is provided. The system includes a chuck adapted for positioning at least partially within the socket of the drill head, the chuck including a first opening for receiving the first drill tool. An adapter is configured for forming a selective locking engagement within the first opening of the chuck, the adapter including a second opening for receiving the second drill tool. The selective locking engagement may comprise a “twist lock” engagement, and the adapter may be arranged for receiving a roof bolt. Related methods are also disclosed.

Abstract: A coupling device for the force-related connection of a device for machining pipes or pipe ends to a drive device is provided. With the aim of a high degree of variability, the coupling device has at least one force transmission device with at least one force transmission element for transmitting rotary forces to at least one force absorption element of at least one force absorption device with respect to a drive axis, wherein the at least one force transmission device is configured to be brought into connection optionally and alternately with force absorption devices which each differ in design with respect to the force absorption elements thereof and preferably differ in design with respect to a center distance between the force absorption elements.

Abstract: A tool head having a shrink-fit chuck (10) that has an axial receiving hole (22), and having a tool (12) that is insertable by way of its cylindrical tool shank (24) into the receiving hole (22), which is open at the front end of the shrink-fit chuck (10), and is fixable therein by thermal shrinking of the shrink-fit chuck (10). The shrink-fit chuck (10) has, in its front end portion, an annular recess (30) that radially widens the receiving hole (22) and is open at the end side, and a function ring (14) is positioned on the tool shank (24), wherein, in the shrink-fitted state, the tool shank (24) is frictionally fixed in the receiving hole (22) and the function ring (14) sits at least partially in the annular recess (30).

Abstract: A compact oldham-type floating reamer holder with holder and reamer portions which transfer torque therebetween via a floating member. The floating reamer holder includes an elastic element which axially biases the holder and reamer portions. In an operative position, the floating reamer holder is configured to automatically enable angular misalignment, parallel misalignment and axial translation between the holder and reamer portion axes. In a non-operative position, the reamer portion axis is co-aligned with the holder portion axis. And the elastic element at least partially overlaps the reamer portion.

Abstract: A tool receptacle for a screw-in tool having a main body, which has a receiving region including at least one conical contact surface for supporting a corresponding conical support surface of the screw-in tool. For thread-protection and for tightening with high concentricity and low production outlay, an insert is disposed in the main body, the insert is movable transversely with respect to the longitudinal axis of the main body and is rotationally-fixed with respect to the main body and has a mating thread for a thread on the screw-in tool.

Abstract: A tool holder, particularly a hand-held power tool holder, is provided for an oscillating and/or rotational drive of at least one insertion tool. The tool holder includes at least one holder-side fastening element that is provided at least substantially for a coupling with the at least one insertion tool. The tool holder also includes at least one bearing unit provided for movably mounting the at least one holder-side fastening element in a movement at least partially deviating from an axial direction. The movement at least partially deviating from the axial direction of the at least one fastening element is provided at least substantially for creating a fastening force in the axial direction.

Abstract: A quick connect/disconnect mechanism for a rotary bit having a central mounting hole at a proximal end includes a shaft extending axially and having a proximal end adapted to be releasably secured in a rotary tool and a distal end having a spud extending distally and axially therefrom. A collet has a plurality of retainer arms arrayed circularly about the axis and extending distally, each retainer arm including a catch extending radially outwardly from a distal end thereof. A support ring extends about the shaft adjacent to said distal end thereof, the support ring being translatable from a first position in which the retainer arms extend freely distally and are deflectable sufficiently to be inserted through the central mounting hole of a rotary bit; to a second position in which the support ring and collet translate proximally and the spud extends distally to engage the retainer arms so they cannot deflect and release the rotary bit.

Abstract: Disclosed is a clamping device of a balancing machine for coaxially clamping a toolholder on a spindle rotary about an axis of rotation (3), in which the coupling shank (8) is supported in the receiving socket only on discrete supports (11-15) which are spaced from each other circumferentially and lie in three relatively spaced engagement planes (E1, E2, E3) intersecting the axis of rotation (3). Four rigid discrete supports (11-14) are arranged in pairs in the first (E1) and the second (E2) engagement plane and combine to form a rigid support in a first radial direction. Formed in the third engagement plane (E3) lying between the first and the second engagement plane is a fifth discrete support (15) which effects a supporting function in a second radial direction opposite the first radial direction.

Abstract: The present disclosure provides exemplary collapsible drills and associated methods of use. Thus, in one aspect, the disclosure provides a collapsible drill including or comprising a chuck, a piston and a motor section. The chuck can be configured and dimensioned to receive a drill bit. The piston can include a pair of interlocking splines. The motor section drives rotation of the piston and the chuck. Depression of the piston can stop rotation of the chuck relative to the piston. In another aspect, the disclosure provides methods of drilling into a material that include providing a collapsible drill, driving rotation of the piston and the chuck with the motor section, and depressing the piston to stop rotation of the chuck relative to the piston.

Abstract: A coolant supply device attached to an electric drilling tool is configured to supply a coolant to a drilling portion at a distal end of a drill. The coolant supply device includes: a first flange member and a second flange member provided axially on a rotating shaft, the rotating shaft sharing a same axis with the drill, the first flange member being positioned at the drill side, the second flange member being positioned such that the second flange member is more distant from the drill than the first flange member; space formed between the flange members, into which a coolant is injected; a coolant supply passage formed between the first flange member and the drill and guiding the coolant in the space to the drill; and a coolant push-out mechanism configured to push the coolant out of the space toward the coolant supply passage.

Abstract: A part ejector is shown and described wherein a machined part in a CNC lathe is ejected from a spindle of the lathe by means of an air pressure differential. The part ejector includes inner and outer tubes that are coupled to, and aligned with a spindle collet. Machined parts are received within the inner tube and a pin tool moves a pin into the inner tube to pneumatically seal the inner tube and push a machined part past one or more air ports that pneumatically connect the inner tube with an air channel located between the inner and outer tubes. Pressurized air is applied to the air channel and the pin is partially retracted to uncover the air ports thus allowing the pressurized air to enter the inner tube and eject the machined part out.

Abstract: An integrated clamping system for a machine tool includes a male locating taper and a tool holder integrally formed therewith and extending therefrom. The male locating taper is configured to be received by a female tapered holding fixture of the machine tool. The tool holder has an axial bore for slidably receiving a machining tool. The male locating taper is also provided with a circumferential groove for receiving cam lobes of a locking cam nut to secure the machining tool to the machine.

Abstract: A right angle attachment for use with a power tool that includes a housing having a handle portion and a gear case attached to the handle portion and supporting first and second right angle gears wherein the first right angle gear is driven by an input shaft that is connected to the drill and the second right angle gear has an opening therein for receiving a hex bit directly therein. A floating magnet head can surround the hex bit to aid in fastener retention and can be movable out of proximity of the hex bit to facilitate easy removal of the hex bit for replacement. An additional magnet can be disposed within the gear case at the base of the hex bit in order to magnetize the hex bit and further enhance the retention of the fastener therein.

Abstract: A rotary device for a cutting tool assembling and disassembling apparatus includes an engaging seat with an engaging block. On the engaging block is defined an engaging hole and a threaded hole. A support seat is formed with a receiving cavity and a plurality of positioning grooves around a peripheral edge of the receiving cavity for engaging with the engaging block. The connecting member is inserted through a positioning hole of the support seat and into the engaging hole of the engaging seat. Then, a fastener is screwed in the threaded hole of the engaging seat to fix the connecting member. Thus, the engaging seat can be elastically abutted against the support seat, and the engaging block is selectively engaged in and disengaged from the positioning grooves. Therefore, the angle of the engaging scat can be easily adjusted to facilitate assembling and disassembling of cutting tools.

Abstract: A fastening tool is provided that incorporates, in an outer annular body into which a first nut is inserted to be driven to rotate, an inner annular body into which a first nut and a second nut having a pitch different from the pitch of the first nut are inserted to be driven to rotate, and that simultaneously rotates the two nuts and fastens the nuts to a bolt. A flange shaft body is driven to rotate relatively to the outer annular body and the inner annular body via a plurality of balls. The balls are held by the flange shaft body and pressed towards notches of the outer annular body and the inner annular body with urging forces of first and second urging members via holding members respectively.

Abstract: A machining system that includes an ultrasonic machining assembly, wherein the ultrasonic machining assembly further includes a machining tool; a collet adapted to receive the machining tool; and an ultrasonic transducer, wherein the ultrasonic transducer is operative to transmit acoustical vibrations to the machining tool; and a machining apparatus, wherein the machining apparatus is adapted to receive and secure the ultrasonic machining assembly, and wherein the machining apparatus is operative to transmit torque to the machining tool by applying rotary motion to the ultrasonic machining assembly.

Abstract: A chuck device for holding an unmodified, circumferentially round tool shaft or collet includes an annular head portion having a distal end surface, a laterally spaced coupling end section, an outer circumferential surface, and a central longitudinally extending bore with an inner circumferential bore surface to slidingly receive the tool shaft or collet with the tool axis aligned collinearly with the bore axis. The head portion includes a first slot extending inwardly on one side of the annular head and normal to the distal end surface, and a second slot extending from the outer circumferential surface normal to and intersecting the first slot to form stationary and pivotable segments having a bore-facing, tool grasping surface that radially directs a compressive grasping force in an amount sufficient to hold the tool with a slip-torque of up to about 430 inch-lbs. at a rotational speed of up to at least about 20,000 rpm.

Abstract: A chuck for clamping an article has a receiving portion including a receiving bore having a longitudinal axis L, and a radially inwardly facing contoured clamping and receiving inner surface. A clamping sleeve is accommodated in the receiving bore and is rotatable between a releasing position and a securing position. The contoured clamping and receiving surface has one or more clamping segments, each clamping segment having a ramp between a trough and a crest, a second ramp between the crest and a depression, and a third ramp between the depression and the succeeding stop ridge. Rotating the clamping sleeve within the receiving bore causes one or more rollers associated with each clamping segment to cooperate with the contoured clamping surface to effect the releasing and the securing of the article.

Abstract: A dressing roll mounting device for mounting a dressing roll to a dresser shaft of a grinding wheel dressing unit is provided. The dressing roll mounting device includes a mounting sleeve to be positioned at a free end of the dresser shaft, the outer face of the mounting sleeve being provided with a conical mounting region serving as a centering and pushing-on aid during mounting of the dressing roll to the dresser shaft. The maximum outside diameter of the conical mounting region is smaller than or corresponding to a dressing roll reception diameter of the dresser shaft.

Abstract: A shrink-fit chuck tool holder which comprises: clamping means which are provided centrally with respect to an axis of rotation of the tool holder for holding a shank of a rotary tool, and which define a receiving opening for the shank. The clamping means can be displaced in the radial direction between a release position for insertion or removal of the shank and a clamping position. The clamping means are assigned a clamping surface with a cylindrical contour which, in the clamping position, bears against the outer circumferential surface of the shank. The clamping surface has a helical groove surrounding the axis of rotation or a multiplicity of annular grooves surrounding the axis of rotation, which as seen in the direction of the axis of rotation project towards the axis of rotation and the roof surfaces of which form the clamping surface.

Abstract: A drill wrench for driving drill steels, drill bits, and bolts during drilling and bolting operations is disclosed. The drill wrench may include an internal driver for driving a drill steel. The internal driver may be inserted in an internal-drive recess defined within an end of the drill steel. When the drill wrench is rotated, the internal driver may drive the drill steel by engaging at least one surface within the end of the drill steel. The drill wrench may also include an external support member that supports the drill steel during drilling. The external support member may also drive the drill steel by engaging an outer peripheral portion of the drill steel when the drill wrench is rotated.

Abstract: The invention relates to a clamping device with a base body (2) which comprises a central receptacle (5) for a component or tool to be clamped, in the base body (2) at least one groove (6) being formed which is open to a face side of the base body (2), and with at least one clamping wedge (9b) which can be pressed axially into the groove (6) from the open face side of the latter to radially deform an inner wall section (7) lying between the groove (6) and the receptacle, which is characterized in that the wall (10) which defines the groove (6) on the outside is designed to be elastic over at least an axial partial section such that it is elastically deformed to the outside when the at least one clamping wedge (9b) is pressed into the groove (6).

Abstract: The invention relates to a tool holder comprising a tool receptacle for frictionally clamping a tool shaft. A sleeve is arranged between the tool shaft and the clamping surface of the tool holder, said tool holder applying pressure to the tool shaft via the sleeve, producing the friction fit. At least one of the bearing surfaces of the sleeve is interrupted by open surfaces that are designed and arranged such that they form the damping cavities.

Abstract: The invention proposes a tool holder (1), in particular of the shrink-fit chuck type, the receiving section (5) of which comprises clamping means (9) which are provided centrally with respect to an axis of rotation (7) of the tool holder (1) for holding a shank (15) of a rotary tool, and which define a receiving opening (13) for the shank (15). The clamping means (9) can be displaced in the radial direction between a radially widened release position for insertion or removal of the shank (15) and a clamping position, in which the clamping means (9) exert radial press-fit forces, which hold the shank (15) in a frictional lock on its cylindrical outer circumferential surface (19), on the shank (15). The clamping means (9) are assigned a clamping surface (17) with a cylindrical contour which, in the clamping position, bears against the outer circumferential surface (19) of the shank (15) with surface-to-surface contact.

Abstract: A tool holder includes a shank including a tool holder portion and a central bore for accommodating a cutting tool, and a first shrink fit sleeve disposed about the tool holder portion of the shank. An application of heat to the tool holder causes the tool holder portion and the first shrink fit sleeve to expand outwardly, and the removal of heat will cause the tool holder portion and the first shrink fit sleeve to contract inwardly to rigidly maintain the cutting tool within the tool holder by shrink fit. The tool holder may also include a second shrink fit sleeve disposed about the first shrink fit sleeve to provide increased torque capability.

Abstract: The invention proposes a tool holder (1), in particular of the shrink-fit chuck type, the receiving section (5) of which comprises clamping means (9) which are provided centrally with respect to an axis of rotation (7) of the tool holder (1) for holding a shank (15) of a rotary tool, and which define a receiving opening (13) for the shank (15). The clamping means (9) can be displaced in the radial direction between a radially widened release position for insertion or removal of the shank (15) and a clamping position, in which the clamping means (9) exert radial press-fit forces, which hold the shank (15) in a frictional lock on its cylindrical outer circumferential surface (19), on the shank (15). The clamping means (9) are assigned a clamping surface (17) with a cylindrical contour which, in the clamping position, bears against the outer circumferential surface (19) of the shank (15) with surface-to-surface contact.

Abstract: A chuck for clamping an article has a receiving portion including a receiving bore having a longitudinal axis L, and a receiving bore inner surface. A clamping sleeve is accommodated in the receiving bore and is rotatable between a releasing position and a securing position. The clamping sleeve has a radially outwardly facing contoured clamping surface provided with one on more clamping segments, each clamping segment having a ramp between a trough and a crest, and a depression on the other side of the crest. Rotating the clamping sleeve within the receiving bore causes one or more rollers associated with each clamping segment to cooperate with the contoured clamping surface to effect the releasing and the securing of the article.

Abstract: A tool clamping insert has a tool holder for receiving a tool shank. The tool holder hole is nominally smaller than the tool shank to be therein but upon heating of the insert expands to a size permitting insertion of the tool shank and, upon cooling, shrink fitting therein. The insert has an external clamping surface and is positioned in a clamping unit. The clamping surface and the tool holder hole are each configured with diameters, external and internal respectively, that change along the progression of their axial lengths.

Abstract: An attachment for a power tool has a tool receptacle for receiving a tool bit, a locking unit which is detachably mountable on a housing of a power tool, an output shaft, which is connectable to a drive shaft of the power tool in a manner fixed against relative rotation, and a device for adjusting the torque.

Abstract: A chuck includes a body, a connector, a bit-retaining device and a pusher. The body includes a first section, a second section, a hexagonal hole defined in the first section and a circular hole defined in the second section. The connector includes a substantially circular and toothed section fit in the circular hole of the body. The bit-retaining device is movably mounted on the first section of the body between a releasing position where a bit can be inserted into and removed from the hexagonal hole of the body and a retaining position where the bit can be retained in the hexagonal hole of the body. The pusher is movably disposed in the body and used to push the bit from the hexagonal hole of the body in the releasing position of the bit-retaining device.

Abstract: An attachment for a power tool has a tool receptacle for receiving a tool bit, a locking unit which is detachably mountable on a housing of a power tool, an output shaft, which is connectable to a drive shaft of the power tool in a manner fixed against relative rotation, and a device for adjusting the torque.

Abstract: A shrink fit tool holder includes a shank or body that includes a tool holder portion, a flange member, a tapered outer surface that generally corresponds to a tapered bore of a spindle, and a central bore or aperture for accommodating a cutting tool. The central bore includes a plurality of grooves formed in a predetermined pattern that decrease a surface contact area between the tool holder portion and the cutting tool, thereby reducing an amount of conductive heat transfer between the tool holder portion and the cutting tool. As a result, there is less expansion in the tool shank relative to the tool holder.

Abstract: A tool holder structure includes a holder installed on a connecting portion of a machine for holding a tool, the holder has a connecting cone for connecting the connecting portion, and a latching portion with an external diameter larger than the connecting cone disposed at the bottom of the connecting cone. The invention installs a ring between the latching portion and a surface of the connecting portion for pressing and connecting the connecting portion to define a tight engagement, so that the holder can be connected to a machine by the connecting cone as well as the ring. The invention can greatly enhance the stability for operations and the precision of manufacturing dimensions, and the invention can be used extensively for various different machines and holders of existing specifications while providing stable operations of the machines and extending the life of the machines.

Abstract: A weight 4 which is held by a weight holder 3 in a balancer has a pressing face 4b? which is pressed against a guide face 12a provided along the circumferential direction of rotation of the weight holder 3 by centrifugal force generated by rotation of a rotary body. When the rotary body rotates, the weight 4 which is pressed against the guide face 12a via the pressing face 4b? changes its position relative to the rotary body in the circumferential direction of rotation, whereby the weight 4 is disposed in a position in which it suppresses whirling motion of the rotary body. The guide face 12a and pressing face 4b? are inclined relative to the axial direction of rotation so as to tend to outward side in the diametrical direction of rotation as tending to one side in the axial direction of rotation. The weight 4 is pressed against a receiving portion 7a? by component of the centrifugal force, in which the component acts along the guide face 12a and pressing face 4b?.

Abstract: A rotary tapered tool holder includes a body or shank including a front contact portion and a rear contact portion. An adapter sleeve is disposed about a portion of the shank. The adapter sleeve includes slits that allow radial expansion and contraction of the adapter sleeve. The adapter sleeve includes an inner surface formed at a first non-zero taper angle with respect to a longitudinal axis of the shank, and an outer surface formed at a second non-zero taper angle with respect to the longitudinal axis of the shank. The second taper angle is different than the first taper angle such that an interference fit between the shank and the inner surface of the adapter sleeve forces the outer surface of the adapter sleeve into positive contact with a tapered bore of a spindle of the rotary tapered tool holder.

Abstract: A modular tool connection assembly includes a housing which defines the main axis of assembly with a linear bore for containing the components of the assembly. The housing contains a connector component presenting a first taper portion. The connector is retained in the linear bore of the housing with a spring interposed between the connector and the housing. A tool containing a second taper portion is placed in axial engagement with the first taper causing the components to be securely connected. The spring limits the force applied between the taper portions allowing them to be disconnected easily.

Abstract: A chuck includes a holder body, a clamp sleeve, and a large number of needle rollers. The holder body has a shank portion, a flange, and a chuck sleeve. The clamp sleeve is fitted onto the outer circumference of the chuck sleeve such that the clamp sleeve is rotatable and axially movable relative to the chuck sleeve. The needle rollers are disposed between the chuck sleeve and the clamp sleeve over the entire circumference. The clamp sleeve is rotated to cause the needle rollers to revolve spirally along the outer circumferential surface of the chuck sleeve while rotating about their own axes in order to decrease and restore the diameter of the chuck sleeve. A thrust member is disposed between the end surface of the flange opposite the shank portion and a corresponding end surface of the clamp sleeve.

Abstract: A toolholder and insert arrangement includes an insert having a cutting portion and a shank portion disposed at a base of the cutting portion. The toolholder has a first end attachable to a spindle and a second end having a shank-receiving opening. When the toolholder is at ordinary room temperature, the shank-receiving opening is smaller than the shank portion. Upon heating of the toolholder to a predetermined temperature above the ordinary room temperature and above an ordinary operating temperature, the shank-receiving opening expands to become at least as large as the shank portion. Upon cooling of the toolholder to a temperature below the predetermined temperature and after insertion of the shank portion in the shank-receiving opening, the shank-receiving opening shrinks to generally conform to a shape of the shank portion.

Abstract: The adjustable-length tool holder for a rotating tool comprises a base element (7) which is provided with a coupling shank (9) for connecting to a machine tool and which, axially remote from the coupling shank (9), ends in a sleeve part (11) forming a central locating opening (13). The tool holder also comprises a plurality of tubular-cylindrical extension sleeves (15, 19) which in turn each form a central locating opening (17, 21) and of which a first extension sleeve (15) is arranged in an interference fit in the locating opening (13) of the sleeve part (11) in such a way that it can be positioned in an axially variable manner, and each of the further extension sleeves (19) is arranged in an interference fit in the locating opening (17) of the adjacent extension sleeve (15) toward the base element (7) in such a way that it can be positioned in an axially variable manner.

Abstract: A chuck for retaining the shank of a tool bit or accessory, having a fixed diameter, inserted in a central channel at a distal end of said chuck, comprising at least one torsion spring mounted axially within a housing and having an inner dimension and shape comparable to said shank's outer dimension and shape, and mechanical means for winding and unwinding said torsion spring to respectively grip or release said shank, said winding being in a rotational direction consistent with a normal operating rotational direction of said chuck such that said shank tends to further wind said torsion spring for further self-tightening in normal operation.

Abstract: A modular tool connection assembly includes a housing which defines the main axis of assembly with a linear bore for containing the components of the assembly. The housing contains a connector component presenting a first taper portion. The connector is retained in the linear bore of the housing with a spring interposed between the connector and the housing. A tool containing a second taper portion is placed in axial engagement with the first taper causing the components to be securely connected. The spring limits the force applied between the taper portions allowing them to be disconnected easily.

Abstract: A tool holder includes a plurality of elastic engagement pieces arrayed along an outer perimeter of a shank. During and after assembly, the elastic engagement pieces elastically abut at least an inner surface of a tapered hole in a main shaft joined to the tool holder and deform slightly in a radial direction. The elastic engagement pieces provide uniform engagement force with the main shaft over a broad surface area. An elastic flange provides additional elastic engagement and easy separation from the main shaft. Together, the elastic engagement pieces and elastic flange reliably engage and securely attach the main shaft to the tool holder while aiding disengagement.

Abstract: A surface connection between mechanical components having intermediate deformable elements between the connected contact surfaces, shaped as segments of solid or hollow cylinders with straight or curvilinear axes and their cross sections are compressed in the radial direction during assembly of the connection, thus allowing for adjustments of relative positioning of the connected components, for compensating dimensional imperfections, and for enhancement of stiffness and/or damping of the connection.

Abstract: A holder for a machine tool includes a cone-shaped base body. One end of the base body has a larger diameter than the other end and includes an annular flange extending therearound. The flange includes first and second recesses formed therein. Each recess includes a bottom surface. The first and second recesses respectively form identical first distances from the bottom surface to an outer periphery of the flange. One of the recesses includes a hole. A depth-reducing element is securable in the hole such that an outer surface of the element is disposed between the bottom surface and the outer periphery, wherein an effective depth of the recess having the depth-reducing element is shorter than an effective depth of the other recess.

Abstract: A junction is proposed between two tool parts, where a first tool part has a recess in hollow cone shape, and a second tool part has a cone-shaped projection that can be inserted into the recess. The junction is characterized by the fact that the recess (7) and the projection (33) have practically the identical angle of taper, that the projection (33) is structured to be practically non-resilient, and the wall (9) that surrounds the recess (7) of the first tool part (holder (1)), is structured to be resilient, and that the two tool parts (1, 31) are provided with flat surfaces (23, 37) that rest against one another when the two tool parts (1, 31) are connected. It is essential that the two tool parts are secured together in the assembled state of the junction (1), in an axial direction by means of a clamping device in such a way that the wall (9) of the first tool part (1) is expanded.

Abstract: An end mill chucking structure for chucking an end mill having a relatively small diameter and used, for example, for deep milling of a die. The end mill chucking structure includes an end mill holder and an end mill. A holder body has a taper hole formed therein. The end mill includes an end mill body and a cutting tip provided at an end portion of the end mill body. A portion of the end mill body located opposite the cutting tip serves as a tapered shank portion. The shank portion and the rest of the end mill body are bounded by a shoulder extending outward from the surface of the shank portion. The shank portion is press-fitted or shrink-fitted into the taper hole such that the end face of the holder body abuts the shoulder of the end mill body, through application to the holder body of heat at a temperature lower than a conventional shrink-fitting temperature.

Abstract: A vibration dampened spindle and tool holder assembly for a rotary cutting machine. The assembly includes a spindle and a tool holder retained therewith. The tool holder has an interfacing ledge with a top surface for abutment with a distal spindle surface, and a continuous channel disposed in a proximal portion of the top surface. A resilient dampening member, having a rectangular or a circular cross sectional configuration, resides in the channel for compressed abutment with the spindle surface. Because the dampening member is situated within the channel, the interfacing placement of the spindle surface and tool holder top surface meet as the dampening member is enshrouded in the channel by these abutting surfaces and thereby protected from contaminant entry during dampening action.

Abstract: A tool holder includes a holder body which in turn includes a shank portion, a flange portion, and a tool attachment portion; a taper cone fitted to the shank portion; an elastic member interposed between a rear-end face of the flange portion and a front-end face of the taper cone; and a stopper member disposed on the shank portion so as to support a rear-end face of the taper cone. The outer surface of the taper cone is tapered at an angle equal to that at which the wall surface of a taper hole formed in a spindle of a machine tool is tapered. The inner surface of the taper cone and the outer surface of the shank portion are equally tapered at an angle smaller than the angle at which the outer surface of the taper cone is tapered. Through drawing of the holder body, the taper cone expands radially to thereby be tightly held within the taper hole. A spacer is bonded to the end face of the spindle so as to eliminate a gap which is formed between the flange portion and a spindle.

Abstract: A vibration dampened spindle and tool holder assembly for a rotary cutting machine. The assembly includes a spindle and a tool holder retained therewith. The tool holder has an interfacing ledge with a top surface for abutment with a distal spindle surface, and a continuous channel disposed in a proximal portion of the top surface. A resilient dampening member, having a rectangular or a circular cross sectional configuration, resides in the channel for compressed abutment with the spindle surface. Because the dampening member is situated within the channel, the interfacing placement of the spindle surface and tool holder top surface meet as the dampening member is enshrouded in the channel by these abutting surfaces and thereby protected from contaminant entry during dampening action.