Abstract: When a rotary table rotates, a main control section of a multi-tasking machine detects vibration of the rotary table on which a workpiece is mounted based on fluctuation of a position droop computed by a servo system. The main control section computes the arrangement position (the eccentricity amount and the eccentricity angle) of the workpiece with respect to the rotary table based on, for example, the detected vibration, the weight of the workpiece, and the rotation speed of the rotary table. The main control section computes the attachment position of a balancer with respect to the rotary table based on the computed arrangement position of the workpiece. Therefore, a suitable attachment position of a vibration suppressing balancer with respect to the rotary table is easily obtained.

Abstract: A mounting arrangement 1 is provided in which clamping pairs comprising a clamping pad 2 and seating pads 3 are arranged about a mounting end of a component 4. Thus, the component 4 is appropriately presented to a machining device but the component 4 can slip relative to the pads 2, 3 in order to relieve residual stresses in the component due to initial forging processes. A damper 8 is provided in order to augment vibration control in association with the contact abutments between the pads 2, 3. In such circumstances accurate machining of a component 4 to a final profile 6 from an initial rough profile 5 can be achieved more efficiently without periodic release of the component 4 so that distortions are avoided in the final component as a result of retained residual stresses by previous clamping.

Abstract: The invention relates to the field of toolings for high-accuracy finishing through-holes and non-through-holes, such as for example for calibration, lapping operations. More precisely the invention refers to a tool-holding system for high-accuracy calibration of the type comprising a driving shaft (2) and a driven shaft (3) mutually connected by two cardan joints (5) and that provides an external cylindrical body (6) supported through bearings (8) by said driving shaft (2). The cylindrical body or liner (6) is closed on its bottom side by a driving bush oscillating in a plane perpendicular to the driven shaft rotation axis; said oscillations being compensated by elastic means. Axial compensation means for driven shaft movements are also provided. The liner (6) forms a chamber (7) that is kept full of oil.

Abstract: A tool holder has a cutter arbor. The cutter arbor has a shank portion detachably mounted on a spindle, and a mechanism for holding a cutting tool. In the cutter arbor portion, a cavity portion is formed. In the cavity portion, a vibration damping material is filled at a filling rate so as to be capable of obtaining predetermined vibration damping characteristics. Thus, it is possible to provide high vibration damping characteristics, effectively damp vibrations during cutting and improve working precision, without using any special materials, such as damping materials, although the tool holder has a usual shape.

Abstract: A machine tool for performing a machine tool function including components adapted to cooperate with each other to execute the machine tool function. The machine tool has a number of constituent parts and a number of sheets of damping material. Each component includes constituent parts with sheets of damping material interposed between the constituent parts. The sheets dampen vibration of the machine tool during performance of the machine tool function.

Abstract: A milling disk for a floor machining appliance has a plurality of mounts for holding interchangeable plate-like milling tips, the milling disk being driven for rotation by the floor machining appliance and being held substantially parallel to the substructure to be machined so that the milling tips may bite into the substructure and remove matter from the surface thereof. The milling tips are constituted by ceramic cutting tips.

Abstract: There is provided a linear guide apparatus which, owing to the use of a gap-free braking device in a rolling guide, has a sufficiently high damping capacity. The linear guide apparatus for guiding a linear motion of a movable body along a guide rail on a fixed structure in a machine tool, includes: a rolling guide section including a rolling element for rolling on a rolling element-rolling surface of the guide rail; and a brake section for enhancing the damping capacity of the rolling guide section, the brake section including a pair of brake shoes, having a flexible structure, for sliding on the rolling element-rolling surface of the guide rail.

Abstract: A vibration damping tool having the following structure is provided. In the vibration damping tool, a hollow portion is formed in the interior of the distal end portion of a tool body and one end of a weight member is connected to the inner wall surface of the distal end side of this hollow portion. A gap created between the outer peripheral surface of the weight member and the inner wall surface of the hollow portion is filled with a visco-elastic body. The one end of the weight member is formed as a narrow diameter shaft portion. The tool body can be divided into two and freely removed from and reattached at a dividing surface located on the base end side of the hollow portion. A hole portion is formed inside the other end of the weight member by hollowing out the interior thereof. Chatter vibration is thus absorbed using a simple structure without there being any effects from heat generated during cutting processing.

Abstract: An engraving element of an electronic engraving machine for engraving printing forms is formed of a shaft oscillating around a longitudinal axis with small rotational angles. A drive system is provided for the shaft with a lever attached to one end of the shaft. An engraving stylus is provided for engraving the printing form, along with a restoring element for the shaft, a bearing for the shaft, and a damping mechanism for the shaft having a damping element secured to the shaft and a stationary damping chamber. The damping element comprises at least one damping disk that is designed circularly at least in regions and extends perpendicular to the shaft. The damping chamber is designed at least as a hollow-cylindrical segment around the shaft into which the damping disk projects and extends at least over the circular region of the damping disk. The damping chamber is filled with a ferro-fluidic fluid as a damping agent.

Abstract: A drill for working in metallic materials includes a tool body having located in its front end at least one cutting insert, wherein the tool body is provided with one or several damping elements mounted such that during machining, a relative movement (i.e., sliding and/or deformation) of the tool body and the damping element is allowed to occur.

Abstract: A drilling tool includes a drill body having chip channel formed therein and carrying cutting inserts at front ends of respective chip channels. Disposed in the chip channels at a location spaced from the cutting insert are respective damping elements. Each damping element comprises first and second portions formed of respective materials of different rigidity.

Abstract: An improved attenuator for damping vibrations and noise when disc brake rotors are being machined in a machining lathe. The improved attenuator has a handle comprised of a squared end with legs extending at angle of 100° to the squared end toward each other. Damping pads are mounted on the ends of the legs to press against the surfaces of the rotor being machined. The 100° angle of the legs toward each other improves the biasing force against the rotor surfaces. Additionally, the damping pads are provided with a notch that fits around and over the tips of cutting bits of the machining lathe to securely hold the pressure pads in place. Another improvement includes a fastening strap attached to the squared end of the handle that wraps around a biasing spring and the carriage on the machining lathe to securely hold and maintain the position of the attenuator.

Abstract: A machine tool capable of performing an accurate machining by preventing a second saddle 6 from displacing aslant to suppress the vibrations of a spindle head 8, wherein a column 2 is fixedly installed on bed 1, a first saddle 4 is movably guided by the column 2 in vertical direction f1, a second saddle 6 is movably guided by the first saddle 4 in lateral direction f2, a spindle head 8 is movably guided by the second saddle 6 in longitudinal direction 18, and interfitted guide route devices 5A, 5B, 5C for guiding the second saddle 6 in lateral direction f2 are formed at the rear lower position of the first saddle 4 as well as at the front upper and lower positions of the first saddle 4.

Abstract: A portion (14a, 14b) of a chip remover (14) is defined to be vibratory to give an NC machine tool (MT 1) a vibration transferable onto a surface (FS) of a work (13) under a finishing by the NC machine tool (MT1), a decision is made whether the NC machine tool (MT1) enters the finishing, and vibration of the vibratory portion (14a, 14b) is controlled, as the decision is true. A chip removal method and an NC machine tool equipped with a spiral chip remover (113) as a chip remover have various chip removal rules for determining permission/prohibition of the operation of the spiral chip remover (113). This spiral chip remover (113) operates based on commands described in a machining program. When a command in the machining program is executed, the permission/prohibition of the operation of the spiral chip remover (113) is controlled according to the chip removal rules.

Abstract: The invention relates to the field of toolings for high-accuracy finishing through-holes and non-through-holes, such as for example for calibration, lapping operations. More precisely the invention refers to a tool-holding system for high-accuracy calibration of the type comprising a driving shaft (2) and a driven shaft (3) mutually connected by two cardan joints (5) and that provides an external cylindrical body (6) supported through bearings (8) by said driving shaft (2). The cylindrical body or liner (6) is closed on its bottom side by a driving bush oscillating in a plane perpendicular to the driven shaft rotation axis; said oscillations being compensated by elastic means. Axial compensation means for driven shaft movements are also provided. The liner (6) forms a chamber (7) that is kept full of oil.

Abstract: A dynamical instrument for machining comprising a sensor responsive to a non-rotating part of a machine proximate the tool of the machine for outputting a vibration signal, and a processor responsive to the sensor output configured to calculate a plurality of signature quantities which characterize the dynamics of the vibration signal and correlate the signature quantities to detect parameters associated with the operation of the machine.

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 motorized device including a first element, a second element, a third element, a fourth element, and a fifth element, wherein in this device the fifth element is constructed around an elongated piece perforated by an axial channel, which elongated piece is referred to as a sixth element, an axial channel of the sixth element is of an inner diameter greater than an outer diameter of the first element such that an entire longitudinal axis of the sixth element is able to be engaged along the first element, at least one of the first element and the sixth element is equipped with a seventh element, the function of the seventh element is to ensure a coupling in rotation of the first and the sixth elements.

Abstract: The apparatus (1) comprises at least two balancing rings (10) disposed in axial side by side relationship and coaxial with each other on the rotating body (13) to be balanced. The rings (10) are each unbalanced and rotatable with the rotating body (13), but can each be angularly rotated relative to the latter through positioning members. These members may comprise either a gear (29) that can be selectively engaged in rotation with peripheral toothings (28) of the rings (10) when the rotating body (13) is stopped, to bring the rings (10) to a relative angular position to which the situation of balance of the rotating body (13) corresponds, or locking elements to be selectively engaged with peripheral notches in the rings (10) to retain the rings (10) one by one while the rotating body (13) is rotated relative to the rings (10) through such an angle that the angular balance position is achieved.

Abstract: A machine tool driven by linear motors along a plurality of axes, and unusually robust and rigid, comprises a bed which defines at least a first axis, at least one column operably connected and supported only at one of its ends by said bed, for its guided movement along the first axis, said at least one column extending away from the bed to define a second axis, at least one saddle mount operably connected and supported by the at least one column, for its guided movement along the second axis, at least one main saddle supported by the saddle mount, for its guided movement along a third axis and supporting a spindle for the movement of a tool, wherein said at least one column comprises a portal structure having a first shoulder opposed to a second shoulder such as to define a window within which the saddle mount is arranged, and wherein, between said opposed shoulders and the saddle mount, linear motors are interposed such as to move the saddle mount along said second axis, producing an effect of attraction of

Abstract: With high speed machine tools, there is a desire to dampen vibrations and to retain the damper mass in proper position. The present invention relates to a tuned damped absorber support providing simultaneous energy dissipation in both horizontal and vertical directions which also provides for proper mass position retention. The tuned damped absorber assembly is attached directly or indirectly to a machine component requiring damping. Both single damper mass and double damper mass configurations are shown. With a double damper mass, the system can be tuned to two different frequencies. Therefore, the double damper mass provides for optimization in both a vertical and a horizontal direction.

Abstract: A tool holder includes a holder body which in turn includes a flange portion. A plurality of threaded holes are formed in the flange portion. A weight balance adjustment member(s) is removably screwed into an appropriate threaded hole(s). The adjustment member includes a coming-out prevention mechanism for preventing the same from coming out of the threaded hole. In another tool holder, weight balance adjustment members are removably screwed into all the threaded holes, each of the adjustment members includes a coming-out prevention mechanism for preventing the same from coming out of the threaded hole, and a detachment prevention member is provided on the outer circumferential surface of the flange portion in order to prevent detachment of the adjustment members.

Abstract: A line transfer system with a contour machining head. The system includes a transmission arbor, a housing, a contour machining head, a driving system, and a system controller. The transmission arbor mounts within the housing, with the transmission arbor and housing sharing a common central axis. At least one contour machining head mounts to the housing. The contour machining head includes a bit tool, a slidable carriage, a linkage, a counterweight, and a pilot. The bit tool is configured for machining the workpiece, and mounts to the slidable carriage. The linkage connects to the carriage and transfers a force from the transmission arbor to the slidable carriage resulting in an independent radial movement of the bit tool with respect to the central axis. The counterweight links to the transmission arbor to dynamically counterbalance the radial movement of the slidable carriage and bit tool. Finally, the pilot connects to the contour machining head and aligns the contour machining head with the workpiece.

Abstract: A tunable toolholder with a dynamic vibration absorber wherein an absorber mass is compressed between two resilient supports utilizing at least one longitudinally movable pressure plate to dynamically tune the toolholder. The pressure plate is displaced by an adjustment screw extending through the front face of a toolholder head removably mounted at one end of the toolholder.

Abstract: A tool holder has a cutter arbor. The cutter arbor has a shank portion detachably mounted on a spindle, and a mechanism for holding a cutting tool. In the cutter arbor portion, a cavity portion is formed. In the cavity portion, a vibration damping material is filled at a filling rate so as to be capable of obtaining predetermined vibration damping characteristics. Thus, it is possible to provide high vibration damping characteristics, effectively damp vibrations during cutting and improve working precision, without using any special materials, such as damping materials, although the tool holder has a usual shape.

Abstract: A machine tool has a spindle head and ball screws on a saddle. The spindle head is provided via sliding or rolling guide members so as to be linearly movable. The ball screws move the spindle head along the guide members. Concave sliding or rolling guide portions parallel to the guide members are provided on both sides of the guide members. Counterweights linearly movable on the concave guide portions in a direction opposite to the spindle head are provided. Racks are provided on opposed surfaces of the counterweights and the spindle head along the directions of movement of the spindle head and the counterweights. Pinions meshing with the racks are rotatably supported in the saddle. The machine tool can effectively suppress vibrations of a structure (such as the saddle) generated during movement of a moving object (such as the spindle head) relative to the structure by a drive line (such as the ball screws), and always keep the center of gravity of an entire relatively moving portion constant.

Abstract: A housing and hub for an apparatus for securing a workpiece to a rotatable machine member are provided. The machine may include a lathe. The workpiece includes a rotor such a brake rotor. The apparatus includes a hub slidably engageable with a rotatable driven shaft of the lathe. The hub is formed with a first banded channel. Also included is a centering device axially positionable on the shaft. A spring having a distal end demountably insertable in the hub, and a proximal end connectable to the centering device, is included. The apparatus also includes a retaining ring attachable to the hub for retaining the centering device in the hub. A housing is provided that is freely movable axially on the shaft for securing the rotor substantially vertically on the shaft. The housing is formed with a second banded channel. A locking nut is included to secure the components of the apparatus on a machine member.

Abstract: A tool fixing device for clamping a tool in a tool holder, wherein the tool holder has a receptacle configured to clamp a shaft of the tool, has at least one static flexible element inserted into a force flow between the tool and the tool holder. The static flexible element is designed to damp tilting and bending vibrations of the tool in cooperation with a damping element provided in the receptacle at the free end of the shaft of the tool. This prevents chattering of the tool.

Abstract: The machining head for machining valve seats comprises a driving system, a housing, a carriage feed assembly, a cutting tip mounted on the carriage, and a counterweight assembly. The driving system rotates a machining head on a spindle axis, and further provides independent vertical translation of each of a driving arbor and a spindle, both of which are independent of the rotation of the spindle. The carriage has both forward and backward feed capability for moving the cutting tip radially inward or outward as it cuts. Vertical movement of the arbor is converted into force for moving the carriage by a cantilever pivoting around a fixed point. The counterweight assembly, linked to the arbor by a second cantilever, counterbalances the shift in weight caused by the movement of the carriage in order to maintain dynamic balancing as the machining head rotates.

Abstract: A holding chuck has a clamping device for firmly holding the tire-wheel in the position aligned with a center axis of a holding chuck. Chatter-suppressing dampers are disposed on an intermediate plate fitted around the chuck. The dampers are disposed on circles concentric with the center axis of the holding chuck. Each of the dampers has a damping rod extending in the direction parallel to the center axis and abutting a rim of the wheel. A damper cover is disposed between the rim of the wheel and the dampers and fastened to the holding chuck. The damper cover has slot holes disposed on a circle concentric with the center axis of the chuck which allow the damping rods of the dampers disposed on only one of the concentric circles to extend therethrough and abut the rim of the wheel.

Abstract: Briefly, according to this invention, there is provided a balancing assembly for balancing a rotating member and the combination of a rotating member and balancing assembly. The balancing assembly includes an annular ring, a locking member and a cover. The annular ring has an opening for receiving the rotating member and at least one removable primary balancing weight and at least one removable secondary balancing weight. The locking member secures the annular ring with respect to the rotating member. The cover operatively contains the secondary balancing weight with respect to the annular ring and includes a connecting section for removably coupling the cover to the annular ring.

Abstract: In milling operations, periodically sensed vibration signals synchronous with tool revolution enables a determination of whether the tool returns to approximately the same position each revolution. If so, stability is indicated by tightly grouped values of the periodically sensed vibration signal. If the tool does not return to the same position, spread in the value of the periodically sampled vibration signals is produced thereby indicating chatter conditions. Variance values may be calculated and displayed; histograms may be produced and displayed; corrective action, if needed, may be taken in response to the variance values and/or histogram. Nominal (or commanded) spindle speed, while not necessarily exactly synchronous with actual tool rotation, is entirely adequate to trigger samples and achieve clear indication of the presence or absence of chatter.

Abstract: A tunable toolholder with a dynamic vibration absorber is disclosed wherein an absorber mass is compressed between two elastomer supports utilizing at least one longitudinally movable pressure plate to dynamically tune the toolholder.

Abstract: A hand tool apparatus uses a cutting tool with a first width and a tool axis to machine a hole in an object. The hole has a second width at least as large as the first width of the cutting tool. The apparatus includes a housing, a spindle unit in the housing for rotating the cutting tool and an orbital drive for rotating the spindle unit. An axial feed mechanism moves the orbital drive and the spindle unit jointly either toward or away from the object being machined.

Abstract: The invention of this patent is an adjustable rotary tool counter balanced system. The invention provides for balancing weights that are mounted to a cutting tool body to provide a means to compensate for a rotational balance error induced by the variable positioning of a cutting tool. The invention allows a user to adjust the cutting tool within the cutting tool body, so as to maximize tool efficiency. The user can also balance the rotational mass about the axial center line of the cutter tool body, by means of the balancing weights, thus eliminating vibration caused by an unbalanced rotating cutting tool.

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: In a machine tool having a base member, a member moveable relative to the base member, an elongated drive screw supported on the base member and an operative connection between the moveable member and the drive screw whereby upon driving the drive screw the moveable member will be caused to be displaced relative to the base member, an anti-whip device generally consisting of a drive screw support member pivotally supported on the base member, having angularly spaced arm sections alternatively disposable in a line of travel of the operative connection and engageable with the elongated drive screw in supporting relation at points intermediate the ends thereof, each of the arm sections being engageable by a component of the moveable member as it traverses in a selected direction to cause the arm section to pivot out of its drive screw support engagement, ahead of the operative connection, and simultaneously cause the other of the arm sections to pivot into its drive screw support engagement, behind the passage o

Abstract: A tool holder assembly 10 including a tool holder 12 having a balancer assembly 21 adapted to selectively provide improved unbalance compensation.

Abstract: A method and apparatus mitigates vibration associated with the rotary cutting machines by providing a first dampening member which is disposed around a tool holder and positioned so as to be compressed intermediate the tool holder and spindle of the rotary cutting machine. A cutting tool is shrink fit to the tool holder. A neck is formed in an elongate shank of cutting tool and has dampening material disposed thereabout. The dampening material disposed around the tool holder, the dampening material disposed around the neck, and the shrink fitting of the cutting tool to the tool holder cooperate so as to minimize undesirable vibration of the cutting tool.

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 assembly 10 including a tool holder 12 having a balancer assembly 21 adapted to selectively provide improved unbalance compensation.

Abstract: A rotary machine tool holder has therein intermediate its ends a plurality of balancing screws that are mounted in internally threaded blind bores that extend part way into the holder from equi-angularly spaced points about an outer peripheral surface formed on the holder intermediate its ends, and coaxially of an axial bore in the holder. The screws are adjustable along axes disposed substantially tangentially of the axial bore of the holder, and are prevented from projecting radially beyond the outer peripheral surface of the holder by a plurality of cap screws removably mounted in the holder to have the heads thereof restrict the extent to which the balancing screws can be adjusted toward the outer surface of the holder.

Abstract: A damped tool holder system having, in combination, a longitudinally extending cylindrical tool provided with a forward outer cutting or operating end and a rearward inner end which is to be held within a tool holder; a coaxial tool holder receiving the inner end of the tool; a rigid mechanical support connection between the tool and the tool holder at a first region thereof; and a second annular support connection between the tool and the tool holder at a second region thereof spaced from but adjacent the first region and effected by a vibration damping annular film structure disposed therebetween at said second region.

Abstract: A balance weight has first and second margins at right angles to one another with the second margin larger than the first margin. A balance weight groove in a rotor has outer and inner wall portions, with the outer wall portions spaced a distance less than the spacing between the inner wall portions. The balance weight has a central threaded opening receiving a screw and a driving slot in the upper face of the weight. An insertion tool is threaded to the balance weight to insert the balance weight through a turbomachinery access opening into the groove. The tool is rotated to locate the second margins below the outer wall portions of the groove. By inserting a driving tool through the insertion tool, the screw is rotated to lock the balance weight to the rotor and in the groove. Upon removal of the insertion and driving tools, a staking tool is inserted through turbine access opening to stake the balance weight and rotor and the screw and balance weight.

Abstract: A method for automatically minimizing an undesirable motion of a workpiece during a machining operation, and a universal adaptive machining chatter control fixture that operates in accordance with the method. The method comprises the steps of mounting the workpiece to an active, supporting structure, and then machining the workpiece. During the step of machining, an undesirable motion of the workpiece is sensed in the supporting structure. Thereafter, a compensating motion is applied to the supporting structure for minimizing the undesirable motion of the workpiece. The chatter control fixture can be attached to various types of machine tool devices, without requiring that the machine tool devices be retrofitted, and operates to minimize undesirable motions of the workpiece independently of the machine tool devices.

Abstract: A vibration-absorbing end effector of an automated drill and countersink machine having a shock to mitigate communications of vibrations to the drill tool, while simultaneously dampening the vibrations at their source, in order to increase control of a drill tool during drilling and countersinking operations. The end effector comprises a measurement scale to ensure that the depths of holes to be drilled and countersunk can be checked and corrected in accordance with corresponding ideal depths stored in a memory of the computer already interfaced to the end effector. Furthermore, the pressure foot of the end effector is upwardly rotatable to access the drill tool to the chuck.

Abstract: Methods of and apparatuses for mitigating chatter vibrations in machine tools or components thereof. Chatter therein is suppressed by periodically or continuously varying the stiffness of the cutting tool (or some component of the cutting tool), and hence the resonant frequency of the cutting tool (or some component thereof). The varying of resonant frequency of the cutting tool can be accomplished by modulating the stiffness of the cutting tool, the cutting tool holder, or any other component of the support for the cutting tool. By periodically altering the impedance of the cutting tool assembly, chatter is mitigated. In one embodiment, a cyclic electric (or magnetic) field is applied to the spindle quill which contains an electro-rheological (or magneto-rheological) fluid. The variable yield stress in the fluid affects the coupling of the spindle to the machine tool structure, changing the natural frequency of oscillation.

Abstract: A numerical control system for a machine tool comprises a feed speed setting unit, which outputs a signal of a set feed speed of the machine tool, and a feed speed overriding unit, which outputs a signal of a feed speed overriding according to an input of the feed speed overriding. An interpolation unit connects to the feed speed setting unit and the feed speed overriding unit. The interpolation unit determines a command signal of the feed speed of the machine tool by performing interpolation calculations according to he signal of the set feed speed unit and the signal of the feed speed overriding unit. Based upon its calculations, the interpolation unit outputs a target position of each spindle at each sampling time.

Abstract: A multiple-spindle machine includes a support and a number of spindles rotatably mounted to the support. Each of the spindles is operably connected and in driving relationship to a respective one of a like number of cutters, each of the cutters having two or more cutting edges. Each spindle is operably connected to an individually controllable electric motor. A controlling device controls the speed of each electric motor and the angular position of its associated spindle. A phase control device adjusts the speed and the angular position of each of the spindles such that the cutting edges of each of the cutters are out of phase with each of the cutting edges of others of the cutters during operation of the multiple-spindle machine. Angular position and speed detecting devices are used for detecting angular positions and speeds of each of the spindles. The angular position and speed detecting devices are in signal transmitting relationship with the phase control device.

Abstract: A tool holder that uses a dampening drive member to reduce slippage between the tool holder and the spindle and while further eliminating harmonic resonance. The tool holder is used in a rotating spindle that has at least one cam recess formed on a lower face thereof. The tool holder includes a conically tapered shank portion which is insertable into the spindle. Disposed adjacent to the shank portion is a flange portion. Extending about the flange portion is a compressible dampening drive member that has at least one cam portion sized and configured to engage a respective one of the cam recesses of the spindle. When the tool holder is secured to the spindle, the dampening drive member is compressed therebetween. The dampening drive member is adapted to eliminate harmonic resonance attributable to the use of the tool holder and prevent slippage between the tool holder and the spindle.