Abstract: Systems, instruments, and methods are described in which a scalpet device comprises a housing configured to include a scalpet assembly. The scalpet assembly includes a scalpet array and one or more guide plates. The scalpet array includes a set of scalpets, and in embodiments the set of scalpets include multiple scalpets. The guide plate maintains a configuration of the set of scalpets. The set of scalpets is configured to be deployed from and retracted into the housing, and is configured to generate incised skin pixels at a target site when deployed. The incised skin pixels are harvested.

Abstract: Systems, instruments, and methods are described in which a scalpet device comprises a housing configured to include a scalpet assembly. The scalpet assembly includes a scalpet array and one or more guide plates. The scalpet array includes a set of scalpets, and in embodiments the set of scalpets include multiple scalpets. The guide plate maintains a configuration of the set of scalpets. The set of scalpets is configured to be deployed from and retracted into the housing, and is configured to generate incised skin pixels at a target site when deployed. The incised skin pixels are harvested.

Abstract: Embodiments include a system comprising a cannula assembly configured for rotational fractional resection (RFR). The cannula assembly includes at least one cannula configured for rotational operation and enclosed in a depth guide configured to control an insertion depth of the at least one cannula. The depth guide includes a vacuum chamber configured to maintain vacuum to evacuate resected tissue generated by the RFR.

Abstract: Embodiments include a system comprising a carrier and a cannula assembly. The carrier includes a proximal end and a distal end, and the proximal end is configured to removeably couple to a remote console. The cannula assembly, which is configured to removeably couple to the distal end of the carrier, is configured for rotational fractional resection (RFR) and includes at least one cannula rotatably coupled to the carrier and enclosed in a depth guide configured to control an insertion depth of the at least one cannula. The depth guide includes a vacuum chamber configured to form vacuum to evacuate resected tissue generated by the RFR.

Abstract: Embodiments include a method comprising determining histological factors at a target site of a subject, and determining parameters of a fractional resection based on the histological factors. The parameters include dimensionality of a fractional field, orientation of the fractional field, resection depth, and a vector of directed closure. The method includes configuring a cannula assembly for the fractional resection that includes a procedure to generate a fractional field at the target site by fractionally resecting tissue according to the parameters. The fractional resection includes applying a cannula array of the cannula assembly to the target site, and rotating at least one cannula of the cannula array to circumferentially incise and remove a plurality of skin plugs in the fractional field.

Abstract: Device and method for reaming bone. In exemplary embodiments, the device may comprise a shaft configured to be rotated about a long axis thereof. The device also may comprise a plurality of cutting members connected to a distal end region of the shaft, rotationally offset from one another about the long axis, and forming a portion of an expandable cutting head. The device further may comprise an inner member configured to be moved with respect to the shaft to change a diameter of the cutting head. In exemplary methods, the device may be utilized to ream a medullary cavity while being pushed or pulled along the medullary cavity.

Abstract: Raw data in distributed servers is divided into groups of data called buckets containing raw data that have timestamps that fall within a specific time range. When a bucket becomes inactive a server can archive the bucket to an external storage system. The external storage system containing archived data may be specified in a search query. Archived data from the external storage system is obtained, processed, and a search performed on the processed archived data using the search query.

Abstract: A method, system and apparatus for a kitting and automation assembly. The system includes an inspection apparatus that captures information of a component. A controller is coupled to the inspection apparatus for receiving and evaluating the information to determine a conforming component. The assembly apparatus includes a datum tool that is operatively configured to contact a datum reference of a part to determine a proper position of the part. The method includes capturing a data set indicative of a characteristic of a component and comparing the data set to a stored data set having a desired characteristic to determine a conforming component. The method also includes picking and positioning the conforming component at an installation position, contacting a datum reference of a part with a datum tool to confirm a proper position, and placing the conforming component on to the part at the proper position.

Abstract: A jackable building foundation system includes a steel beam support frame platform to which one or more platform jacks are attached. Vertical movement of the platform in response to jacking is constrained by cuboidal column guides at the four corners. Each of the column guides comprises two tiers of square roller frames, within each of which is an I-beam engaged between the flanges on either side by two rollers supported on horizontal axes. The orientations of the I-beams and rollers alternate orthogonally at each corner of the platform, so that torques generated by uneven jacking are suppressed and do not result in jamming of the platform as it rises. The system is remotely controlled and monitored by a digital device, such as a smartphone, using application software.

Abstract: A jackable building foundation includes a steel beam support frame platform to which one or more hydraulic jacks are attached. Vertical movement of the platform in response to jacking is constrained by cuboidal column guides at the four corners. Each of the column guides comprises two tiers of square roller frames, within each of which is an I-beam engaged between the flanges on either side by two rollers supported on horizontal axes. The orientations of the I-beams and rollers alternate orthogonally at each corner of the platform, so that torques generated by uneven jacking are suppressed and do not result in jamming of the platform as it rises.

Abstract: A moving body guide mechanism of a machine tool includes at least two bar-shaped guide members, and sliders engaged with the two guide members, respectively, movably with respect to the guide members so that a moving body is guided along an axis parallel to a moving axis extending in a longitudinal direction of the guide members. Attaching surfaces of the two guide members or the sliders to the moving body are provided symmetrically across a plane including the axis parallel to the moving axis in such a manner that an angle formed by the attaching surfaces becomes smaller than 180°.

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 printed circuit board (PCB) drilling apparatus that greatly increases the speed, accuracy and depth of the drilling process as well as increasing the life of the drill bits by decoupling the reactionary forces encountered in the positioning and drilling functions of the apparatus in the x, y and z axes from the components that accomplish the positioning, measuring and drilling of the stacked printed circuit boards. The part of the apparatus that moves and drills as well as the feedback position sensors are mounted to a set of vibration isolation pads that absorb the vibrations that would disturb the feedback sensors. Additionally, the force frame of the apparatus that experiences the reactionary force movements are decoupled from the metrology frame of the apparatus that house the feedback sensors, also increasing the throughput and accuracy.

Abstract: The present invention relates to methods and systems for automatically feeding a feeding housing (206) of a drilling device (200). The drilling device (200) includes a drill stand (202), a drilling machine (204) and a feeding housing (206). Further, the drilling machine (204), which is suspended by the feeding housing (206), includes a drill with a drilling motor for performing a drilling operation through a drilling object. The feeding unit (208) includes an electric feeding motor for feeding the feeding housing (206) along the stand (202). Further, the feeding unit (208) also includes a controller for manually influencing the feeding motor's direction of rotation, speed and feeding force.

Abstract: A handheld power drill apparatus includes a drill motor, a carriage motor, a drilling implement with an interchangeable locking chuck, an electronic controller, and guide plates. The guide plate is slidably mounted to accommodate different work piece thicknesses. The drilling implement is coaxially mounted on a lead screw mounting plate. The drilling implement is positioned substantially orthogonal to the workpiece. The drilling implement is automatically driven into a workpiece by the carriage motor.

Abstract: A printed circuit board (PCB) drilling apparatus that greatly increases the speed, accuracy and depth of the drilling process as well as increasing the life of the drill bits by decoupling the reactionary forces encountered in the positioning and drilling functions of the apparatus in the x,y and z axes from the components that accomplish the positioning, measuring and drilling of the stacked printed circuit boards. The part of the apparatus that moves and drills as well as the feedback position sensors are mounted to a set of vibration isolation pads that absorb the vibrations that would disturb the feedback sensors. Additionally, the force frame of the apparatus that experiences the reactionary force movements are decoupled from the metrology frame of the apparatus that house the feedback sensors, also increasing the throughput and accuracy.

Abstract: A portable power drill includes a housing, a drilling implement carrying drive spindle, and a drive motor for rotating and axially feeding the drive spindle. The drive spindle is rotatively and axially displaceable relative to the housing and connected to the drive motor via angle gears, a feed mechanism and two bevel gears supported on the drive spindle. The drive motor is drivingly connected to the drive spindle via a belt drive transmission, a feed shaft, and an angle gear including an axially locked but rotative nut piece. The feed shaft is located in parallel with and coupled to the drive motor via a transmission and drivingly connected to said nut piece. The drive motor is an electric motor controlled and monitored by a programmable control unit.

Abstract: A core drilling system is disclosed herein in which a torque tube has a groove or keyway which receives a rotating wheel or key to prevent a transmission box and motor from rotating during drilling operation. As such, the operator does not need to hold a stabilizing arm to resist counter rotational forces during the drilling process. The operator may focus on the hole to be cut in a substrate. Additionally, a torque tube stabilizing leg assembly may be secured to the free distal end portion of the torque tube.

Abstract: A handheld machining device (1), particularly for boring, having a mechanism includes: a first mounting (20), on which a tool holder (2), and a motor (3, 4) arranged to rotate the tool holder (2), are mounted; a second mounting (30); and an element (40) for translatably guiding, between the first mounting (20) and the second mounting (30), a linear actuator (5) enabling the first mounting (20) to be spaced apart from the second mounting (30), and the first mounting (20) to be brought toward the second mounting (30). The motor (3, 4) is electric, and the rotor (4) of the first motor (3, 4) is directly mounted onto the tool holder (2) and is rigidly connected thereto.

Abstract: An apparatus may include a housing, a spindle system located in the housing, a tool guide associated with the housing, and a magnetic unit associated with the housing. The spindle system may be capable of rotating a tool about an axis of rotation. The tool guide may be capable of engaging a receptacle at a location on a workpiece. The magnetic unit may be capable of securing the tool guide in the receptacle when the tool guide is engaged with the receptacle.

Abstract: The present invention relates to methods and systems for automatically feeding a feeding housing (206) of a drilling device (200). The drilling device (200) includes a drill stand (202), a drilling machine (204) and a feeding housing (206). Further, the drilling machine (204), which is suspended by the feeding housing (206), includes a drill with a drilling motor for performing a drilling operation through a drilling object. The feeding unit (208) includes an electric feeding motor for feeding the feeding housing (206) along the stand (202). Further, the feeding unit (208) also includes a controller for manually influencing the feeding motor's direction of rotation, speed and feeding force.

Abstract: A cutting device includes a support base, a first slide module, a second slide module slidably connected to the first slide module, and a cutting module. The support base includes a support surface and a slide portion on the support surface. The first slide module is slidably positioned on the slide portion. The sliding direction of the second slide module is perpendicular to the sliding direction of the first slide module. The cutting module includes a fixed frame fixed on the second slide module, a driving device fixed on the fixed frame, and a cutter connected to the driving device. The driving device drives the cutter to rotate around a central axis of the cutter and move up and down along the central axis. The central axis is perpendicular to the support surface. The cutter includes a hollow cylindrical blade. An end surface of the blade faces the support surface.

Abstract: An object is to provide a drill for a composite material which can realize high-quality boring hardly causing burrs or delamination in boring of a member to be machined containing a fiber reinforced composite material at least partially.

Abstract: A machining tool comprises a frame mounting an extendable yoke slidable with respect to the frame in a first direction through one or more mounting pillars. A tool motor is mounted on the yoke. A drive mechanism for the yoke is also mounted in the frame, with a drive motor to drive the yoke drive mechanism. A belt is between pulleys on the drive motor and mechanism to transmit drive between them. A rotatable sleeve is around the tool motor and on which sleeve the belt engages on opposite sides of the tool motor, whereby the tool motor can extend between the drive motor and mechanism, thereby resulting in a compact arrangement of the tool.

Abstract: The invention relates to a modular spindle unit for forming a multi-spindle machining head (36, 47, 49) for a machine tool, wherein the spindle unit (01, 30, 54) includes at least one drive spindle (02), to which a tool (37) or tool carrier (51, 52) is attachable, and wherein the spindle unit (01, 30, 54) includes a module housing (08, 31) in which the drive spindle (02) is mounted so as to be freely rotatable and axially displaceable. The module housing (08, 31) is attachable to the machining head (36, 47, 49) together with other module housings (08, 31), wherein the spindle unit (01, 30, 54) includes at least one drive motor (03), with which a drive spindle (02) allocated thereto is drivable in rotary manner, and wherein the center axis of the drive motor (03) and the center axis of the drive spindle (02) extend coaxially and define a unit center axis (07).

Abstract: A boring tool for boring cylinder bores (6), with a tool holder (8) and a tool head (4) with a cutting edge carrier for at least one cutting edge (3) and with a rotary drive for driving the at least one cutting edge (3). The cutting edge carrier is provided with a first, preferably hydraulic, adjusting device for the adjustment of a variable cutting radius of the cutting edge (3), a ring module for first support rails (1), which concentrically surrounds the tool head (4), a second adjusting device for the variable radial adjustment of the supporting radius of the first support rails (1), and a third adjusting device for variable radial adjustment of a supporting radius of second support rails (2). The tool head (4) is axially moveable within the ring module. A method for boring cylinder bores (6) involving the use of the boring tool is disclosed as well.

Abstract: A radial tapping attachment for a motor-driven tool includes an enclosed, box-shaped housing, a main shaft assembly adapted to retain a tap, a drive mechanism rotatably driven by the tool and a guide member assembly for supporting an object to be tapped. The main shaft assembly includes a main shaft rotatably coupled to the housing by a pair of bearings, a pair of spaced apart discs fixedly mounted on the main shaft, and a pair of axially mounted compression springs that allow for slight, bi-directional, axial displacement of the main shaft relative to the housing. The drive mechanism includes a drive shaft rotatably coupled to the housing at an approximate right angle relative to the main shaft and a drive wheel mounted on the drive shaft that selectively engages the pair of discs to rotate the main shaft in either direction when an axial force is applied to the tap.

Abstract: A hand-held power tool guiding device and method is disclosed. The device includes a receptacle element for receiving the power tool, a remote control device for operating the power tool, and a transmission device for transmitting the movement of the remote control device to the power tool. The transmission device has a switch actuator and a connecting element, where the switch actuator is adjustable into a standby position during insertion of the power tool into the receptacle element.

Abstract: The invention relates to a machining device for machining a workpiece (W), wherein a rotatably mounted machining tool (2a) is held in a machining unit (2), and the machining unit (2) can be moved axially along the axis of rotation (X) of the machining tool (2a) by means of a feed device (10). The machining device comprises a pressure plate (6), mounted in a freely movable manner by means of a bearing device (4), and a measuring device (8) for position detection. According to the invention, the pressure plate (6) and the bearing device (4) constitute part of a pressure-exerting unit (12), and the pressure-exerting unit (12) can be moved axially with respect to the machining unit (2) in the direction of the axis of rotation (X) and independently of the machining unit (2) by means of a drive device (14) assigned to said pressure-exerting unit.

Abstract: A drilling machine includes a stand unit, a drilling spindle unit, and a drive motor unit. A power control member controls a drive motor of the drive motor unit so as to control the rotational speed of the drive motor. A driving shaft of the drive motor drives a driving shaft sleeve of the drilling spindle unit to bring a working spindle in the driving shaft sleeve. The rotational speed of the drive motor is controlled by the power control member only. The present invention has a simple and endurable configuration, and is convenient for use and has stable configuration.

Abstract: A core drilling system is disclosed herein in which a torque tube has a groove or keyway which receives a rotating wheel or key to prevent a transmission box and motor from rotating during drilling operation. As such, the operator does not need to hold a stabilizing arm to resist counter rotational forces during the drilling process. The operator may focus on the hole to be cut in a substrate. Additionally, a torque tube stabilizing leg assembly may be secured to the free distal end portion of the torque tube.

Abstract: A portable power drill includes a housing, a drilling implement carrying drive spindle, and a drive motor for rotating and axially feeding the drive spindle. The drive spindle is rotatively and axially displaceable relative to the housing and connected to the drive motor via angle gears, a feed mechanism and two bevel gears supported on the drive spindle. The drive motor is drivingly connected to the drive spindle via a belt drive transmission, a feed shaft, and an angle gear including an axially locked but rotative nut piece. The feed shaft is located in parallel with and coupled to the drive motor via a transmission and drivingly connected to said nut piece. The drive motor is an electric motor controlled and monitored by a programmable control unit.

Abstract: A pushing structure of a metal work drilling tool includes a drill housing, a drill assembly, a push part and a feed trigger. The drill assembly is constituted by a drill bit, an extension rod and a power device. When drilling needs to be conducted, the feed trigger is pressed to drive the drill assembly forward that the drill bit gently contacts with the object for drilling; next, the drilling tool is activated and the feed trigger is pushed, then drilling force can be controlled effectively to improve a drilling efficiency and reduce a chance that the drill bit is broken due to percussion.

Abstract: Drill stand including a drill column (4) having front and rear tracks (47, 47?; 48, 48?), at least one of which has a flat track surface and the other a V-shaped track surface. The column 4 includes slot receivers (49, 49?) for protective bumpers (50, 50?) and is mounted on a base plate (2). A carriage (3) reciprocates a drill motor on the drill column (4) and the carriage (3) has internal rollers (51, 51?, 52, 52?) corresponding to the front and rear tracks (47, 47?; 48, 48?).

Abstract: A boring bar feed mechanism comprising a boring bar and a rotation mechanism for rotating the boring bar, a feed shaft, a feed coupling the feed shaft with the boring bar for axially translating the boring bar, and the boring bar is rotationally mounted with respect to but axially fixed to a second end of the feed coupler. A cam is rotationally fixed to the boring bar for rotating with the boring bar and a cam follower interacts with the cam. A plunger housing is supported by an extension of the cam follower and the plunger housing accommodates at least one feed plunger. A converter gear is supported by the feed shaft and the feed plunger interacts with the converter gear to facilitate indexing of the converter gear. The plunger housing is pivotally supported by the extension of the cam follower to permit the plunger housing and the feed plunger to have a limited pivoted motion, relative to the cam follower, as the cam follower oscillates back and forth and indexes the feed shaft.

Abstract: A cushion mechanism in a positive feed drill slows the advancement of a cutter prior to reconnecting with a machining surface during a clearing operation. The cushion mechanism may be inserted in a piston, in front of a shaft, or attached to the outside of the positive feed drill. The cushion mechanism may include a spring washer, a compression spring, or a hydraulic or pneumatic damper. The cushion mechanism provides a safer and more efficient operation for positive peck drilling.

Abstract: A cutting tool having a small diameter is prevented from being heavily loaded to prevent a reduction in service life thereof. An electric drill that rotationally drives an annular cutting tool by using a drill motor (46) as a drive source is brought close to a workpiece by a drill feed unit having a feed motor (20a) to drill the workpiece with the annular cutting tool. In the course of drilling, the motor current of the drill motor (46) is detected by a motor current detector (50). A main controller (64) compares the result of detection by the motor current detector (50) with a preset reference value to identify the tool diameter of the annular cutting tool being used for drilling and sets a control mode for each tool diameter according to the identification result.

Abstract: A boring device is inserted into a lateral pipe to bore a pipe lining material inserted into a main pipe across the lateral pipe intersecting therewith and a portion of which blocks an opening of the lateral pipe that communicates with the main pipe. The boring device has a rotatable shaft, a bearing member for rotatably bearing the rotatable shaft, and a boring blade mounted on the rotatable shaft for rotation therewith to bore through the portion of the pipe lining material that is blocking the opening of the lateral pipe. A supporting member is mounted on one side of the bearing member. An inflatable bag is mounted on the other side of the external periphery of the bearing member. The inflatable bag is inflatable in the lateral pipe so that the inflatable bag and the supporting member are pressed against an internal peripheral surface of the lateral pipe.

Abstract: A rotary-linear system is configured to operate an associated tool. The system includes a rotary-linear actuator having first and second portions that can move linearly and/or rotationally relative to each other, such as about a central axis extending through the actuator. An elongated drive rod extends axially through at least a portion of the actuator, which is operative to rotate about a longitudinal axis thereof generally independently of the actuator. While the rotation of the drive rod can be independent of movement of the actuator, such rotation can be controlled based on the position and/or movement of the actuator. An end of the drive rod near a distal end of the actuator is operative to actuate an associated tool, such as can be mounted at a distal end of the actuator.

Abstract: A machine tool includes a machine body, a first sliding member movable on the machine body along a direction, and a second sliding member movable on the first sliding member along the direction. The first and second sliding members can be driven simultaneously to move on the machine body and the first sliding member, respectively, in the direction.

Abstract: A machine tool includes a machine body, a first driving unit, a first sliding member driven by the first driving unit to move on the machine body along a direction, a second driving unit disposed on the first sliding member, and a second sliding member driven by the second driving unit to move on the first sliding member along the direction.

Abstract: An up modifier is provided which includes a bed, a modifier, a clamp, a modifier linkage system, a clamp linkage system, and a lever. The modifier is disposed below the bed and is vertically traversable thereunder. The clamp is disposed above the bed and is vertically traversable thereabove. The lever defines a modifier pivot, clamp pivot and a pedal portion. The clamp pivot is interposed between the modifier pivot and the pedal portion. The clamp pivot is vertically traversable, and the modifier pivot and the pedal portion are pivotable about the clamp pivot. The modifier linkage system is attached to the modifier and the lever at the modifier pivot, and the clamp linkage system is attached to the clamp and the lever at the clamp pivot.

Abstract: A T-bracket having a pair of spaced apart arms support a housing containing a sprocket wheel and a shaft to turn the sprocket. A handle attached to one end of the shaft turns the sprocket to tighten a chain turning on the sprocket teeth. A flexible wire rod is welded to the T-bracket and is juxtaposed around a rear end of a power drill. The chain is looped around a work piece and attached to a side of the drill opposite from the T-bracket. The handle is turned to tighten the chain and exert force on a drill bit being driven by the power drill.

Abstract: There is provided a guide device for a machining head capable of machining a workpiece such as a cylinder head of an engine accurately, a machine having the guide device, and a guide method. At least one of guide posts formed in a guide post member has an air pressure controlling function capable of fitting and holding a guide bar in the guide post in a non-contact state, and other guide bars have a very small clearance with the guide post facing to the guide bar. Thereby, the position at which the machining head is held is accurately held.

Abstract: A portable boring and welding machine includes a tool shaft adapted to mount tools for boring and welding workpieces. The shaft extends along an axis and is driven by an electric motor. The motor and the shaft are connected by a helical gearwheel and worm pair, the helical gearwheel being connectable to the tool shaft, and the worm being connected to a drive shaft of the motor itself.

Abstract: A cutting tool for forming holes in plastic piping primarily intended for use in holing irrigation pipes for drips and sprinklers ranging from holes with diameter of 2-4 mm. The tool comprises of a blade element made of steel, preferably hardened and provided with a sharpened around cutting edge, and a body and handle made of high strength plastic material, with a lower jaw allowing the holing of pipes ranging from 12-32 mm in diameter.

Abstract: A cutting tool feeding and rotating device for a machine tool includes a first mounting frame with a slide way extending in an axial direction. A tubular housing is mounted on and is slidable relative to the slide way in the axial direction. A spindle is received rotatably in the tubular housing and is driven by a drive member which is mounted on a second mounting frame. A servomotor has an output shaft which drives a drive transmission member which can convert a rotational force of the output shaft to a translation force that is exerted on the second mounting frame so as to force the tubular housing together with the second mounting frame to perform a linear displacement in the axial direction.

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 tool axis passes through a predetermined point on a surface of the object. The apparatus includes an actuating assembly including a housing. The housing contains an axial feed mechanism configured for moving the cutting tool in an axial direction, a spindle motor configured for rotating the cutting tool about the tool axis, and a radial offset mechanism. The radial offset mechanism is configured for moving the axial feed mechanism in a radial direction such that the tool axis is offset from a principal axis. A motor is configured for rotating said axial feed mechanism and the cutting tool about the principal axis.

Abstract: A rigid and fragile material drilling machine is provided, its driving means for driving the upper and lower drilling bit approximating the rigid and fragile material includes a control handle; upper and lower rear gears and associated upper and lower first synchronizing wheels, said upper and lower rear gears being engaged with each other; upper and lower first timing chains being wound around said upper and lower first synchronizing wheels and upper and lower second synchronizing wheels, respectively; upper and lower second timing chains being wound around said upper and lower third synchronizing wheels and upper and lower fourth synchronizing wheels, respectively; and drilling rod guiding sleeves, the gear racks thereof being engaged with said the upper and lower front gears, respectively. The rigid and fragile material drilling machine of the present invention, which is simplified in structure with a compact design and low cost, can be conveniently used wherever a power supply is available.

Abstract: A device in a tool holding assembly for axially moving a rotatable shaft on which is arranged at a first end of the shaft a device for performing work during rotation of the shaft includes an electric motor for rotating the shaft, and at least one bearing radially supporting the shaft and permitting movement of the shaft in the axial direction. The shaft has a second end forming a free end and an electromagnetic mechanism is arranged to affect or operate on the second end of the shaft to draw the shaft in the axial direction from the first end to the second end against the affect of pressure acting against the second end of the shaft in the opposite axial direction. A mechanism controls the electromagnetic mechanism to achieve axial movement of the shaft during rotation of the shaft.