Abstract:
A machining apparatus (1) arranged to work an internal machining surface (21) of a workpiece (2) is described, the machining apparatus (1) including one or more tools (12) rotatably supported in a housing (11) and projecting, at least partially, from the periphery (123) of the housing (11), wherein at least one driving roller (14) is arranged, radially displaceable, in a cut-out (111) in the housing (11) diametrically opposite the tool (12), and the driving roller (14) is connected to an adjusting mechanism (15) which includes a turnable adjusting sleeve which surrounds substantially the whole of a driving motor (131) and is arranged substantially concentrically to the driving motor (131).
Abstract:
A machine tool apparatus includes a transfer arm assembly and a carriage assembly. The transfer arm assembly includes a housing with a tooling end adapted to carry a tooling bit extending therefrom, a spindle extending from the housing for engagement by a chuck, and at least a first drive shaft for transferring rotational motion from the spindle to the tooling end. The tooling end is adapted to carry the tooling bit for rotation about a tooling axis that is angularly offset from a rotational axis of the first drive shaft. The carriage assembly carries the transfer arm assembly and is adapted to allow translation of the transfer arm assembly in at least two directions.
Abstract:
The aim of the invention is to provide a connection means for connecting a first component to a second component, especially for connecting pieces of furniture or parts of machines, said means comprising a first connection element arranged on the first component when the components are connected, and a second connection element arranged on the second component when the components are connected, and enabling a secure connection of the two components consisting of a plurality of materials, without causing any risk of damage to the two components during the assembly thereof. To this end, at least one of the connection elements comprises at least one holding projection that is not self-cutting and has a curved supporting surface in the form of the arc of a circle in a longitudinal section. Said holding projection can be inserted into a groove created on one of the components and having a curved undercut surface in the form of the arc of a circle in a longitudinal section.
Abstract:
An apparatus can deliver a static cutting tool to a position located inside a workpiece to be machined. The cutting tool can be used for machining at least one surface inside of the workpiece. The cutting tool is operable in combination with an electronic controlled machine tool having at least one axially movable drive/support spindle. A cutting tool body can have at least one cutter and an aperture adapted for receiving the axially movable drive/support spindle of the electronic controlled machine tool. A movable carriage can be used for releasibly supporting the tool body and for transporting the tool body between a home position, where the tool body is spaced from coaxial alignment with the axially movable drive/support spindle of the electronic controlled machine tool, and a ready position, where the aperture of the tool body is in a coaxially aligned position with respect to the axially movable drive/support spindle of the electronic controlled machine tool. The carriage can be used for transferring support of the cutting tool body with respect to the movable drive/support spindle of the electronic controlled machine tool when the carriage is in the ready position.
Abstract:
A method of making a component (2) of an orthopaedic joint prosthesis, which has a bearing surface whose shape corresponds approximately to a part of a sphere and is symmetrical about its polar axis, involves use of a cutting tool (6) which has a circular cutting edge (12) and which can be rotated about an axis (8) which is perpendicular to the plane containing the said cutting edge (12). The method involves (a) rotating the component about its polar axis (4) and rotating the cutting tool (6) about its axis (8), with the cutting edge (12) of the cutting tool (6) in contact with the surface of the component (2); (b) moving the cutting tool (i) in a direction parallel to the polar axis (4) of the component (2) while leaving the angle between the axis of the cutting tool (6) and the polar axis of the component (2) unchanged, and (ii) along its axis (8); and (c) repeating step (a). The movements (i) and (ii) of the cutting tool (6) cause the radius of curvature of the bearing surface to change continuously and monotonically as the angle between the radius and the polar axis of the component changes, so that the shape of the bearing surface deviates from that of a true sphere in such a way that discontinuities in the shape of the bearing surface as a result of individual movements are minimised.
Abstract:
A fixation device for positioning a rotating machine tool onto a template, the template having at least one hole and at least one locating pin. The fixation device includes a housing with a housing tool end and a housing template end, a seat located on the housing tool end for coupling with the rotating machine tool, and a clamping mechanism disposed at least partially at the housing template end for coupling with at least one locating pin.
Abstract:
Apparatus for cutting a hole through a plastic liner in a gas or other main comprises a body (10) forming module of a train of modules adapted to travel through the main. The body (10) has a radially movable platform (12) carrying a cutter. The platform (12) has four cams (70) engaging four cams (68) pivotally mounted on tie-bars (22, 24). Advancing movement of the platform (12) pushes the cams (68) outwardly causing support legs (60, 62, 64, 66) to move outwardly and to cause four slave legs carried by the support legs to engage the plastic liner. Further advancing movement of the platform (12) causes the cutter to engage the liner and also holds the support legs in their advanced position as noses on the cams (70) traverse the faces of the cams (68).
Abstract:
The invention concerns a method of producing concave, self-contained bearing surfaces, which are at least part of universal ball joints extending over the ball equator, by machining depressions pre-formed in workpieces by means of a tool having a cutting edge rotating about a rotational axis of said tool, the trajectory having a diameter which is equal to the length of a chord extending to the lowest point of the bearing surface. The cutting movement is composed of the rotary movement of the tool cutting edge and a rotating relative movement between the workpiece and tool about a vertical axis through the centre point of the ball. The feed movement is a relative movement of the tool to the workpiece along the axis of rotation of the tool inclined at the same angle of inclination relative to the vertical axis as the chord to the ball equator. In order to decrease production times and increase the dimensional accuracy of the bearing surface, the invention proposes that the chord (S) originates from the ball equator (A) and the depressed areas on both sides of the ball equator (A) be machined with two separate feed movements. The invention further concerns a bearing surface as a product of this method.
Abstract:
A machine tool apparatus includes a transfer arm assembly and a carriage assembly. The transfer arm assembly includes a housing with a tooling end adapted to carry a tooling bit extending therefrom, a spindle extending from the housing for engagement by a chuck, and at least a first drive shaft for transferring rotational motion from the spindle to the tooling end. The tooling end is adapted to carry the tooling bit for rotation about a tooling axis that is angularly offset from a rotational axis of the first drive shaft. The carriage assembly carries the transfer arm assembly and is adapted to allow translation of the transfer arm assembly in at least two directions.