Crankshaft turning machine

An apparatus for machining axially spaced first and second throws on a shaft having a central axis wherein the throws are displaced laterally outwardly from said central axis in angularly spaced relation to one another, comprising

• a spindle having an axis of rotation,
• means for axially rotating the spindle,
• a chuck for gripping the shaft,
• means for supporting the chuck on the spindle in a first position in which the first throw of the shaft gripped by the chuck is on the axis of spindle rotation and in a second position in which the second throw of the shaft gripped by the chuck is on the axis of spindle rotation,
• a tool for cutting the throws of the shaft gripped by the chuck when the chuck is secured to the spindle in said respective positions,
• said supporting means for said chuck including means for mounting said chuck on said spindle at various points offset radially from the spindle axis,
• means for opening and closing said chuck to release and grip the shaft comprising a draw bar extending through an axial passage in said spindle,
• a variable coupling between said draw bar and said chuck to accommodate to the radial offset of said chuck,
• said variable coupling comprising a connector secured to said draw bar, and
• a head on said chuck slidably engaged with said connector.

An apparatus for machining axially spaced first and second throws on a shaft having a central axis wherein the throws are displaced laterally outwardly from said central axis in angularly spaced relation to one another, comprising

• a spindle having an axis of rotation,
• means for axially rotating the spindle,
• a chuck for gripping the shaft,
• means for supporting the chuck on the spindle in a first position in which the first throw of the shaft gripped by the chuck is on the axis of spindle rotation and in a second position in which the second throw of the shaft gripped by the chuck is on the axis of spindle rotation,
• a tool for cutting the throws of the shaft gripped by the chuck when the chuck is secured to the spindle in said respective positions,
• means mounting said chuck on said spindle in radially spaced relation to the spindle axis wherein the shaft is supported by the chuck in laterally spaced parallel relation to the spindle axis,
• said chuck being axially rotatable relative to said spindle to said first and second positions, and
• releasable lock means are provided to retain said chuck in said respective first and second positions,
• wherein said chuck comprises a collet,
• a collet receiver,
• said collet being capable of closing and opening to hold the shaft when closed and to release the shaft when open,
• said collet receiver being adapted to open the collet in response to relative movement of said collet and collet receiver in one direction and to close the collet in response to relative movement of said collet and collet receiver in another direction,
• said lock means including first teeth on said collet receiver and second teeth affixed to said spindle adapted to engage said first teeth, and
• means for moving said collet receiver relative to said spindle to disengage said teeth and thereby release said lock means and thereafter to relatively move said collet and collet receiver in said one direction to open said collet and release the shaft.

An apparatus for machining axially spaced first and second circular throws on a shaft having a central axis wherein the throws are displaced laterally outwardly equal distances on diametrically opposite sides of said central axis, comprising

• a spindle having an axis of rotation,
• means for axially rotating the spindle,
• a collet for gripping the shaft,
• means for mounting said collet on said spindle at a point offset radially from the spindle axis wherein the shaft is supported by the collet in laterally spaced parallel relation to the spindle axis,
• said mounting means including means supporting said collet for rotation to a first position in which the first throw of the shaft gripped by the collet is on the axis of spindle rotation to a second position 180.degree. from the first position in which the second throw is on the axis of spindle rotation,
• a tool for cutting the throws of the shaft gripped by the collet when the collet is secured in said respective positions,
• means for releasably locking said collet in said first and second positions,
• said mounting means for said collet being capable of mounting said collet on said spindle at various points offset radially from the spindle axis,
• said means for mounting said collet on said spindle comprising a housing for said collet, an index base secured to said spindle, and a spacer clamped between said index base and said collet housing.

An apparatus for machining axially spaced first and second throws on a shaft having a central axis wherein the throws are displaced laterally outwardly from said central axis in angularly spaced relation to one another, comprising

• a spindle having an axis of rotation,
• means for axially rotating the spindle,
• a chuck for gripping the shaft,
• a chuck housing rotatably receiving said chuck,
• means for mounting said chuck housing on the spindle in radially outwardly spaced relation to the axis of rotation of the spindle such that the chuck is rotatable in said chuck housing to a first position in which the first throw of the shaft is on the axis of spindle rotation and to a second position in which the second throw of the shaft is on the axis of spindle rotation, and
• releasable locking means for locking said chuck in said respective first and second positions.