Method of cutting ellipse contour with numerically-controlled ma

Turning – Radially moving rotating tool inside bore – Forming non-circular bore

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408 1R, 409199, B23B 3500

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active

057300364

ABSTRACT:
There is provided a method of cutting an ellipse contour in a numerically-controlled machine tool which can to cut a target ellipse precisely while considering the diameter of the tool, and to machine a three-dimensional ellipse surface as well as a rotated ellipse locus. This method is for controlling the coordinate position of a tool T such that the velocity of the contact point of the tool with the workpiece W in a tangential direction becomes constant with an eccentric angle .theta. relative to the major axis of the ellipse E as a parameter. This method comprises the step of controlling the coordinate position (x.sub.n, y.sub.n) of the center of the tool to track along the path being away from the ellipse E in the normal direction by a distance corresponding to the radius r of the tool.

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patent: 5201618 (1993-04-01), Malarz et al.

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