08.96 5 Measuring Cycles for Milling Machines and Machining Centres
5.3 L979 Workpiece measurement hole/shaft/slot/web/ZO determination (at random angles)
5.3 L979 Workpiece measurement hole/shaft/slot/web/ZO
determination (at random angles)
Preconditions :
• Circle radius programming
• Polar coordinate programming
• Oriented spindle stop (M19) via NC with axis movement
• Optional positioning of probe in spindle between 0 and 360 degrees (all-round coverage)
The cycle has the same range of functions and the same preconditions as L977.
The hole or shaft is determined by this cycle by means of 3-point or 4-point measurement. It is
thus possible to measure circle segments whose centre points are located outside the
machine (see Fig. 5.17).
Measurement at points P1, P2, P3 and P4 is performed at random angles (2D = two-dimen-
sional; measure in two axes simultaneously, depending on the angle of measurement).
The probe is positioned from P1 to P2, from P2 to P3 and from P3 to P4 with circular inter-
polation. The R28 distance between the probe and the contour is maintained. The probe is
positioned at the relevant angle of measurements with M19 to ensure that P1 - P4 are always
measured with the same probe point.
The probe must be calibrated in the plane. If a multidirectional probe is used, calibration must
include determination of the position deviation (e.g. measuring variant R23=10002). The
spindle must be positioned with 0°.
If cycle machine data MDC 7004.0=1 (spindle offset), parameter R13 takes effect even if a
multidirectional probe is in use and can be used to adapt the positioning direction of the
spindle.
• R13=0 Positioning direction of the spindle corresponds to M3
• R13=-360 Opposite positioning direction
At the end of the cycle, the probe is facing P3 (P4) by the amount of R28 (facing P2 in the
case of slot measurement).
The measurement variant is selected by defining R23:
R23 = 1 Measure hole
R23 = 2 Measure shaft
R23 = 11 Measure slot
R23 = 12 Measure web
R23 = 21 ZO determination in hole
R23 = 22 ZO determination at shaft
R23 = 31 ZO determination in slot
R23 = 32 ZO determination at web
Prepositioning: Always facing and level with P1
©
Siemens AG 1990 All Rights Reserved 6FC5197- AB70 5–43
SINUMERIK 840/850/880 (BN)
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