Abstract: A spindle (1) in which the moving part (2) fixed to the tool-holding collet (3) is supported by one or more aerostatic bushes (4) on cushions of air generated by a jet of compressed air that circulates continuously along the air gaps (5) between the aerostatic bushes (4) and the moving part (2) and passes out of the spindle (1) through the co-axial aperture (6) formed in a flange (7) through which the tool-holding collet (3) projects from the spindle (1). Directing elements (8) are attached to the outside of the flange (7) to collect the air passing out of the abovementioned aperture (6) and cause it to adopt an outward direction of motion (E) that is tangential to or incident on the terminal part (3t) of the tool-holding collet (3) and roughly parallel to the axis of the spindle (1).

Abstract: A spindle for machining at high rotational speeds, includes a tool-holding taper collet with radial slits that is kept closed to clamp a tool by pressing it axially against a seat of complementary shape by the reaction force of precompressed elastic elements interposed between the tool-holding collet and the body of the spindle, and is opened by moving it axially away from the seat by applying an axial force to it to further compress the precompressed elastic elements. In the spindle the elastic means are a sleeve of elastic material housed coaxially between the inside wall of a cavity formed in the body of the spindle and a shaped collar of epoxy resin applied coaxially around the outer surface of the free end of the tool-holding collet.

Abstract: A description is given of a spindle (1) in which the moving part (2) fixed to the tool-holding collet (3) is supported by one or more aerostatic bushes (4) on cushions of air generated by a jet of compressed air that circulates continuously along the air gaps (5) between the aerostatic bushes (4) and the said moving part (2) and passes out of the spindle (1) through the co-axial aperture (6) formed in a flange (7) through which the abovementioned toll-holding collet (3) projects from the said spindle (1).

Abstract: Electric motor for driving members that rotate at speeds of greater than 40,000 revolutions per minute, includes a stator housing induction coils, a rotor supporting multiple permanent magnets and located coaxially inside the stator, and multiple Hall sensors integral with the stator and capable of detecting the position of one or more points on the rotor as it rotates in order appropriately to time the injection of the induction currents into the coils as a function of the position of the permanent magnets. The motor includes elements for deactivating all but one of the Hall sensors when the rotor speed of oration exceeds 40,000 revolutions/mm, elements for measuring the rotor speed of rotation as it describes each n-th revolution; and elements for bringing about in the next or (n+1) th revolution of the rotor the injection of the currents into the coils.

Abstract: A multi-phase linear motor includes a number of magnets side by side with multiple phase coils in which alternating currents that are offset by a predetermined value are made to flow. The interaction between the magnets and the phase coils causes a relative linear displacement of magnets with respect to the phase coils. In the linear motor in question, the phase coils lie on an axis that is perpendicular to the direction of motion.

Abstract: An array (10) contains a rotary electromagnetic motor (11) and/or a linear electromagnetic motor (12) that is (are) attached to a tool-carrying sleeve (19) of a machine tool that carries out high-speed working in order to draw off shavings, in which magnets (13, 14i) of the motor(s) are integral with the tool-carrying sleeve (19) itself. In the array (10) magnets (13, 14i) are made integral with the tool-carrying sleeve (19) by a hollow tube (15) that is attached coaxially to the tube on an inside wall (15g) where the magnets are attached coaxially. The array (10) also contains a hollow shaft (16) that is fixed in place while the array (10) is in operation and is inserted coaxially into the hollow tube (15). A number of stator induction coils (17) that interact with the magnets (13, 14i) are arranged on an outer surface of the hollow shaft, and coaxially with respect to the hollow tube.

Abstract: A multi-phase linear motor (1) that comprises a number of magnets (2i) side by side with multiple phase coils (3i) in which alternating currents that are offset by a predetermined value are made to flow, whereby the interaction between said magnets (2i) and said phase coils (3i) causes a relative linear displacement of magnets (2i) with respect to phase coils (3i). In the linear motor in question, said phase coils (3i) lie on an axis (L) that is perpendicular to the direction of motion.

Abstract: An array (10) contains a rotary electromagnetic motor (11) and/or a linear electromagnetic motor (12) that is (are) attached to a tool-carrying sleeve (19) of a machine tool that carries out high-speed working in order to draw off shavings, in which magnets (13, 14i) of the motor(s) are integral with the tool-carrying sleeve (19) itself. In the array (10) magnets (13, 14i) are made integral with the tool-carrying sleeve (19) by a hollow tube (15) that is attached coaxially to the tube on an inside wall (15g) where the magnets are attached coaxially. The array (10) also contains a hollow shaft (16) that is fixed in place while the array (10) is in operation and is inserted coaxially into the hollow tube (15). A number of stator induction coils (17) that interact with the magnets (13, 14i) are arranged on an outer surface of the hollow shaft, and coaxially with respect to the hollow tube.

Abstract: A process for correctly positioning layers of a multilayer printed circuit. A flat closed circuit is attached peripherally on each layer. Each layer is arranged parallel to multiple circuits that are fixed on a reference board. An alternating current flows in one of the fixed circuits. The alternating current electromagnetically induces a current in the flat closed circuit, which in turn electromagnetically induces electromotive forces in other fixed circuits. The characteristic values of the electromotive forces are a function of the relative positions of the fixed circuits with respect to the flat, closed circuit. These values are used to correct the position of each layer on which the circuit is attached until each layer or parts of each layer are stacked in a predetermined position relative to at least parts of the fixed circuits. The corrected position is the position which each layer must maintain in the multilayer circuit. The layers are secured by hot soldering of interposed sheets of synthetic resin.

Abstract: The headpiece is equipped with an aspiration system for continuously sucking up and removing shavings that are formed during machining of a flat board. To the headpiece are attached one or more shaft-like elements, which push on the board that is to be drilled via one of their elastically yielding edges, thus leaving exposed and encompassed between them an area of the board where the holes are to be made. A box, which is open toward the area where the holes are to be made and to which the aspiration system is to be fitted, is attached, over its entire length, to at least one of the shaft-like elements.

Abstract: A tool-holding spindle (1) for machining with the removal of swarf in which rotary movement of the spindle (1) and a tool (2) coaxially fixed to it and axial forward and backward movement of the tool (2) are required, in which the tool (2) is fixed in a hollow member (7) which can move axially and rotate with respect to the body (1d) of the spindle (1) within which it is housed, magnets (4n) forming part of a linear motor (4) whose stator windings (4s) are housed in the body (1d) of the said spindle (1) around the hollow member (7) being fixed to the said hollow member (7), is described.

Abstract: A description is given of a set (10) consisting of a spindle (1) and tool (2) for machining operations to remove shavings by means of rotation, wherein the clamping of tool (2) is accomplished by the action of centrifugal force acting on one or more of the parts that comprise the set, whereby said spindle (1) ends in a cylindrical cavity (3), inside of which is coaxially secured a cylindrical member (5), whose part that faces tool (2) has one or more diametral cuts (6) that divide it into two or more symmetrical portions (5s, 5t) that are able to bend outward in the radial direction under the action of centrifugal force, and wherein tang (7) of said tool (2) ends in a hollow cylindrical tube (7e) that is able to accommodate at least part of said portions (5s, 5t) of said cylindrical member (5), the walls of which have a thickness (S) that is equal to distance (D) between interior wall (3k) of said cylindrical cavity (3) of spindle (1) and the exterior wall of said cylindrical member (5), whereby during the ab