Method for coordinate measurement of workpieces
AssigneeCarl-Zeiss-Stiftung
InventorKarl-Hermann Breyer
Life of this patent
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Abstract
In the measurement of workpieces on a coordinate measuring machine having a work-contacting probe head of the switching type, the course over time of the contact signal is stored within a time interval which at least spans the procedural time of contact-signal development. After comparison or correlation with a prerecorded sample signal which has also been stored, the exact time of initial contact or the exact scanning coordinates are then subsequently computed.
Claims9
A method of establishing coordinate measurements on a workpiece (9), using a probe head (2) of the switching type which produces a time-varying contact signal (28) which initiates upon contact with the workpiece, said method comprising the steps of:
- (a) contacting the workpiece to thereby produce a time-varying contact signal (28) initiated at a time (tk) and concurrently generating related measured-position values (x, y, z);
- (b) storing the time-varying contact signal (28) and related measured-position values (x, y, z) during at least an interval which spans time before, during, and after the time varying contact signal;
- and
- (c) subsequently computing (i) the exact contact-initiated time (tk) within the said interval, and (ii) interpolating from the stored measured-position values (x, y, z) contact coordinates (xk, yk, zk) corresponding to the exact contact-initiated time.
Dependencies are inferred from the claim text.