A guide bush control device includes a guide bush motor that rotates and drives a guide bush; and a controller that controls driving of the guide bush motor, the guide bush control device controlling rotation of the guide bush by controlling the driving of the guide bush motor with the controller, wherein the controller includes a fixing unit that fixes the guide bush non-rotatably by exciting the guide bush motor in a rotation stop state.

A work piece support rest is provided for turning a work piece on a rotating lathe having a lathe bed, headstock, and a headstock spindle, where the work piece is attached to the headstock spindle. The support rest includes an adjustable base releasably attached to the slotted way of the bed via a locking plate and a pair of laterally adjustable way spacers moveable within a laterally extending slot that engage each side of the slotted way. A multi-piece outer ring is releasably attached to the adjustable base. A plurality of roller slides are releasably and adjustably attached to the outer ring, such that each of the roller slides extends radially inwardly and has a roller disposed at an inward distal end thereof for supporting the work piece.

A work piece support rest is provided for turning a work piece on a rotating lathe having a lathe bed, headstock, and a headstock spindle, where the work piece is attached to the headstock spindle. The support rest includes an adjustable base releasably attached to the slotted way of the bed via a locking plate and a pair of laterally adjustable way spacers moveable within a laterally extending slot that engage each side of the slotted way. A multi-piece outer ring is releasably attached to the adjustable base. A plurality of roller slides are releasably and adjustably attached to the outer ring, such that each of the roller slides extends radially inwardly and has a roller disposed at an inward distal end thereof for supporting the work piece.

A guide bush adjusting device includes a drawbar (a mobile body) displaceable relative to a guide bush sleeve (cylindrical body). The drawbar is formed from a screw connection member (a connection member) which is connected to a guide bush housed in the guide bush sleeve (a cylindrical body), and an operation member configured to displace the screw connection member. The guide bush adjusting device adjusts an inner diameter of the guide bush by releasing the operation member from its fixation, displacing the drawbar, moving the guide bush with respect to the guide bush sleeve via the drawbar to thereby position the guide bush, and fixing the operation member of the drawbar (mobile body) at a predetermined position.

A curtain assembly comprises a rotatable drive element wherein at least one helical guide structure is formed on, or into, the outer surface of the drive element. A drive attachment element having a structure that communicates with the helical guide structure to move the drive attachment element axially along the drive element when the drive element is rotated. Specific embodiments incorporate either a manual or motor-driven rotation assembly for rotating the drive element. Further specific embodiments involve a helical guide structure that comprises a helical groove and a structure that comprises a tooth that engages with the helical groove.

An apparatus is provided for lightening of thin, flexible and shaped workpieces by removal machining of material from surfaces thereof, on a machining unit having a worktable and a counterthrust member which rests against a part of the surface of the workpiece opposed to the one on which said tool must work from time to time. The worktable includes a support member of the workpiece to be machined, and gripping mechanism which supports the workpiece during its machining independently of the support mechanism. The counterthrust mechanism includes a board movable according to several axes and carrying a plurality of supporting elements. The supporting elements can be individually translated or in groups between a draw-in position and an extended position to define a supporting plane depending on the shape of the surface of the workpiece against which the counterthrust mechanism rests. A method is also provided for mapping the workpiece surface.

An apparatus is provided for lightening of thin, flexible and shaped workpieces by removal machining of material from surfaces thereof, on a machining unit having a worktable and a counterthrust member which rests against a part of the surface of the workpiece opposed to the one on which said tool must work from time to time. The worktable includes a support member of the workpiece to be machined, and gripping mechanism which supports the workpiece during its machining independently of the support mechanism. The counterthrust mechanism includes a board movable according to several axes and carrying a plurality of supporting elements. The supporting elements can be individually translated or in groups between a draw-in position and an extended position to define a supporting plane depending on the shape of the surface of the workpiece against which the counterthrust mechanism rests. A method is also provided for mapping the workpiece surface.

A main spindle located in a region of a rotary guide bush device where the rotary guide bush device (has been attached to be disposed in a position of a front (F) along an axis (C) direction when the rotary guide bush device having a guide bush, which is supported in a removable manner by a guide bush-supporting base (supporting base) provided in the front (F) along the axis (C) direction of the main spindle, is removed. A seal member (fixed to the guide bush-supporting base has contact with an outer circumferential surface of a main spindle cover over an entire circumference, so that processing with or without the guide bush can be selected and a complicated process required for switching the processing with or without the guide bush can be simplified.

A workpiece turning-over device includes a mounting wall, a gear driving mechanism, and a rotation mechanism. The gear driving mechanism comprises a toothed bar and a driving member. The driving member is able to drive the toothed bar to move. The rotation mechanism comprises a sleeve and a gear. The sleeve is rotatably attached to the mounting wall. A supporting portion extends from the sleeve to secure the workpiece thereon. The gear is fixedly coiled around the sleeve, engaged to the toothed bar, and is able to rotate to rotate the sleeve fixed thereto, thereby allowing the workpiece to rotate.

An apparatus and method for a through cutting machining steady rest comprising a base plate fixed to a vertical support plate where an adjustable workpiece cradle may be adjusted to support a desired workpiece to be machined. A pair of opposing articulating side arms pivotally mounted upon the vertical plate wherein articulation of a fastening means will clampingly engage the side arms upon the desired workpiece. The side arms are engaged at points leaving a gap between the side arms for machining of the workpiece between the side arms. Rollers are implemented upon the ends of the side arms and along the came of the workpiece cradle to allow for a fixed axial hold of the workpiece while allowing the workpiece to be rotated around its longitudinal axis for further machining without the need of unclamping and repositioning the workpiece on the steady rest.