US Patent: 3,866,179 - Numerical Control With Envelope Offset and Automatic Path Segment Transitions


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US Patent: 3,866,179

Numerical Control With Envelope Offset and Automatic Path Segment Transitions

Patentee:

John K. McGee (exact or similar names) - Houston, Harris County, TX

USPTO Classifications:

318/572, 700/176, 700/181, 700/187, 700/188, 700/9

Tool Categories:

metalworking machines : metalworking machine mechanisms : nc and cnc apparatus

Assignees:

Giddings & Lewis, Inc. - Fond Du Lac, Fond Du Lac County, WI

Manufacturer:

Not known to have been produced

Witnesses:

Unknown

Patent Dates:
Applied:	Sep. 22, 1972
Granted:	Feb. 11, 1975

Patent Pictures:

USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Joel Havens
"Vintage Machinery" entry for Giddings & Lewis Manufacturing Co.

Description:

Abstract:

Numerical control for machine tools and the like of the genus described in McGee U.S. Pat. No. 3,656,124. Improvements are here described for digital computations and control which cause a tool or cutter to follow successive path segments programmed in workpiece edge coordinates, even though the servos operate to control the motion and positioning of the center of a cutter having a finite and unforeseeable radius. Additionally, automatic smooth transitions from segment to segment of the path are effected with a tangent fillet machined on the workpiece which has a radius equal either to that of the cutter or a value which is designated as a single numerical value in the program command data.