The Olofsson Corporation

Stephen P Smith

Donald W Garnett

Apparatus for machining first and second throws on a crankshaft wherein the throws are displaced outwardly from the central axis of the shaft in angularly spaced relation to one another. The crankshaft is gripped by a collet. The collet is mounted on a spindle at a point offset radially from the spindle axis. The collet is capable of rotating from a first position in which the first throw is on the axis of spindle rotation to a second position in which the second throw is on the axis of spindle rotation. A tool is provided for cutting the throws when the collet is secured in either one of the two positions. A collet receiver is provided to open and close the collet. A housing for the collet and collet receiver is mounted on the spindle. The collet is locked in each of the two rotative positions by interengaging teeth on the collet receiver and on the housing. When the collet receiver is moved relative to the housing, the teeth become disengaged so that the collet is free to rotate. Thereafter by relatively moving the collet and collet receiver, the collet is opened to release the crankshaft.

Crankshaft turning machine

A machine tool has a main slide movable along a first path and a cross-slide assembly movable perpendicular to the path of the main slide. The cross-slide assembly has a first slide unit which is directly driven by a primary servo control. The cross-slide assembly has a second slide unit driven by the first slide unit through a spring-loaded follower acting against a cam which can transmit numerically-controlled offset to the second slide unit such that both slide units will follow identical paths. The cam is adjustable to enable correction of the offset. Each slide unit carries a cutting tool. The invention is applicable to multiple spindle machines having two or more spindles.

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Lansing, MI, United States of America

Stephen P Smith