Machine tool controller
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United States of America Patent
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Nov 24, 1987
Grant Date -
N/A
app pub date -
May 29, 1986
filing date -
May 29, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The method is used for measuring and/or controlling the position of a rotating reference element of a machine tool as a function of the position of a rotating main guide element. The two elements execute a basic movement with a transmission ratio which is constant in the ideal case. From the elements executing the basic movements pulse sequences are derived and their frequencies are made equal. The reference element executes an additional movement which, compared with the basic movement, occurs slowly and is predetermined as a function of the position of another moving element. To superimpose the additional movement, at least one of the signals describing the basic movement is shifted in phase relative to the reference element and a phase comparison is executed between the signals obtained, in such a manner that the resolution of the phase shift is distinctly finer than the distance between adjacent pulses of the signals derived from the main guide element and from the reference element.
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