Resumes
Resumes
Independent Computer Software Professional
View pageLocation:
Greater Philadelphia Area
Marvin Kreithen Phones & Addresses
-
748 Bobwhite Ln, Huntingdon Vy, PA 19006 (215) 947-5693 (215) 947-7734
-
Huntingdon Valley, PA
-
748 Bobwhite Ln, Huntingdon Valley, PA 19006 (215) 594-7734
Work
Position:
Building and Grounds Cleaning and Maintenance Occupations
Education
Degree:
Graduate or professional degree
Emails
Publications
Us Patents
Control System For Producing Multi-Axis Contour Movement For A Stepping Motor Drive
View pageUS Patent:
39327965, Jan 13, 1976
Filed:
Jan 31, 1973
Appl. No.:
5/328285
Inventors:
Marvin L. Kreithen - Huntingdon Valley PA
John J. Lawler - Newportville PA
John J. Lawler - Newportville PA
Assignee:
Textron, Inc. - Providence RI
International Classification:
G05B 1940
US Classification:
318685
Abstract:
A multi-axis machine tool or the like employing controls for an open loop stepping motor system of two or more axes in which variable frequency feedrate clock pulses are generated to ultimately control the speed of the various stepping motors. The frequency of the feedrate clock pulses is modified in accordance with programmed information; additional information defines the tool path which can either be straight line or circular arc segments and characteristically the feedrate clock pulse generation means increases pulse frequency at the beginning of a segment in such manner as to increase motor speed in accordance with system inertial limitations from a speed below to a speed above the slewing rate of the stepping motors. Thereafter upon sensing a predetermined distance from the end of the segment, pulse frequency is reduced to reduce the stepping motor speed below the slewing rate. Override means is provided to permit an operator to selectively increase or decrease pre-programmed rate to compensate for variable machining factors such as differences in materials, and dullness of tool.