Control system for producing multi-axis contour movement for a s

Details Control system for producing multi-axis contour movement for a s Control system for producing multi-axis contour movement for a s

1973-01-31

1976-01-13

Schaefer, Robert K.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318603, 318604, 318696, G05B 1940

Patent

active

039327965

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.

REFERENCES:
patent: 3411058 (1968-11-01), Madsen et al.
patent: 3414785 (1968-12-01), Orahood
patent: 3435314 (1969-03-01), Bradley et al.
patent: 3523230 (1970-08-01), York
patent: 3553549 (1971-01-01), Leenhouts
patent: 3579279 (1971-05-01), Inaba
patent: 3582751 (1971-06-01), Rosshirt et al.
patent: 3617715 (1971-11-01), Dummermuth
patent: 3648144 (1972-03-01), Rosen
patent: 3789971 (1974-02-01), Deyesso et al.

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