Measurement Accuracy And Functional Testing; Measuring Accuracy; Probe Functional Test - Siemens SINUMERIK 802D sl Function Manual

13.4

Measurement accuracy and functional testing

13.4.1

Measuring accuracy

Accuracy
The propagation time of the measuring signal is determined by the hardware used. The
delay times are in the µs range plus the probe response time.
The measurement uncertainty is calculated as follows:
Measurement uncertainty = measuring signal propagation time x traversing velocity
Correct results can only be guaranteed for traversing velocity where not more than one
triggering signal arrives per position controller cycle.
13.4.2

Probe functional test

Example of functional test
The functional test for the probe is conducted favorably via an NC program.
%_N_PRUEF_MESSTASTER_MPF
N10 R10
N20 R11 MESSWERT_IN_X
N30 T1 D1
N40 ANF: G0 G90 X0 F150
N50 MEAS=1 G1 X100
N60 STOPRE
N70 R10=$AC_MEA[1]
N80 IF R10==0 GOTOF FEHL1
N90 R11=$AA_MW[X]
N95 M0
N100 M2
N110 FEHL1: MSG
N120 M0
N130 M2
Example of repeat accuracy
This program allows the measuring scatter (repeat accuracy) of the entire measuring system
(machine-probe-signal transmission) to be calculated.
In the example, ten measurements are taken in the X axis and the measured value recorded
in the workpiece coordinates.
Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0
13.4 Measurement accuracy and functional testing
;Testing program probe connection
;Flag for trigger status
; Preselect tool offset for probe
;Starting position and meas. velocity
; Measurement at measuring input 1 in the X
axis
; Read switching signal at 1st measuring
input
;Evaluation of signal
;Read in measured value in workpiece
coordinates
; Probe not switching!
Measurement (M5)
253