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US 4,106,375 AGranted
Variable feed high-production precision machine
AssigneeLitton Industrial Products, Inc.
InventorsFelix J. Gurdak, Francis W. Cook, Jr.
Life of this patent
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AssigneeLitton Industrial Products, Inc.
InventorsFelix J. Gurdak, Francis W. Cook, Jr.
Estimating the term…
A high-production, precision machine tool has means for varying the feed rate of the tool during the actual machining of each workpiece. The means comprise a plurality of program cams disposed on the camshaft of the machine tool for selecting the appropriate feed rate at the desired time during the machining operation. The camshaft is rotated by a permanent magnet D.C. motor, and as the camshaft rotates, the program cams, in turn, trip a plurality of switches to gate one of several predetermined voltage signals representative of the desired motor speeds to a comparator which compares the gated signal with the output of a tachometer measuring the actual motor speed. The difference, a voltage signal representative of the correction to be made to the motor, is applied to a silicon controlled rectifier firing circuit which selectively fires an SCR network, generating a shaped pulse to provide a controlled voltage input to the motor, thereby selectively controlling its speed.
In a machine tool having movable slides for moving a slide mounted tool holder through a tool path relative to a rotating workpiece to machine said workpiece to a desired form,
In a contour boring and turning machine tool having a horizontal slide and an associated vertical slide, one of said slides being adapted to support a tool, and means for moving said slides to move a supported tool through a tool path thereby to machine a rotating workpiece to a desired shape, said means including a camshaft, a horizontal cam on said camshaft for moving said horizontal slide, a vertical cam disposed on the camshaft for moving said vertical slide, said horizontal cam and said vertical cam each having a plurality of sectors of predetermined profile which together define said tool path coordinates in each revolution of said camshaft, the improvement comprising
Dependencies are inferred from the claim text.