Programming Example - Siemens SINUMERIK 840D sl Programming Manual

Measuring Cycles for Milling and Machining Centers
5.6 CYCLE979 workpiece: Measure hole/shaft/groove/rib at an angle
See also
Variable measuring velocity: _VMS (Page 76)
Offset angle position: _CORA (Page 76)
Tolerance parameters: _TZL, _TMV, _TUL, _TLL, _TDIF and _TSA (Page 77)
Measurement path: _FA (Page 78)
Probe type, probe number: _PRNUM (Page 79)
Empirical value, mean value: _EVNUM (Page 80)
Multiple measurement at the same location: _NMSP (Page 81)
Weighting factor for mean value calculation: _K (Page 81)
5.6.3.2

Programming example

Measuring a hole with CYCLE979
The trueness of a circular segment in plane G17 (semi-circle, contour element "hole") is to
be checked. Machining was performed with milling tool T20, D1.
With a variance of >0.01 mm from the setpoint diameter _SETVAL = 130 mm, the tool radius
of this tool should be automatically offset in the wear. The maximum permissible deviation is
taken as max. 1 mm. To obtain a minimum measuring path of 1 mm to the contour, the
measuring path is specified as _FA = 1+1 =2 mm (max. total measuring path = 4 mm).
The center point of the circular segment (setpoint) is X = 180 mm, Y = 0 mm (_CPA, _CPO).
Measurement is to be performed with three-point measurement at a measuring height of Z =
20 mm at initial angle 15° and following angles 80°.
Traversing between points is carried out with a circular feed of _RF= 900 mm/min.
The offset must take the empirical value in memory _EV[19] into consideration. Mean value
calculation _MV[19] and inclusion in calculation are also to be used.
This tool offset will therefore affect the production of the next workpieces or possible
remachining.
Clamping for workpiece:
Zero offset, with settable ZO G54: NVx, NVy, ...
The probe is already calibrated. Arrays for workpiece probe 1: _WP[0, ...]
182
Programming Manual, 03/2009 Edition, 6FC5398-4BP10-2BA0
Measuring cycles