Measuring Cycles For Turning And Milling Work; L981 Searching For A Hole/Slot; Alarms - Siemens SINUMERIK 840 User Manual

07.90
6 Measuring Cycles for Turning and Milling
Work
6.1

L981 Searching for a hole/slot

Function and application
Cycle L981 searches for the position of a hole/slot on a face or at a cylinder (outside or inside)
with the aid of a probe on a rotary axis (C axis).
To begin with, the cycle uses the linear axis to position the ball center point of the probe on
the center point circle of the hole/slot specified by R18. Following this, the reference plane
defined by R2 is approached. Now, sensing (searching) of the workpiece can be started. A
hole/slot is assumed to be found if the set approach value (R32) could be approached without
a measuring signal. The search grid (in degrees) and the measuring speed can be preselected
via R parameters.
After the hole/slot has been found, position determination is carried out in the rotary axis. In
addition, the rotary axis position programmed prior to cycle call is used to calculate the devi-
ation. The deviation is allowed for in a ZO memory if the deviation ascertained is less than the
specified positional tolerance (R36), depending on the definition of R10. An alarm is triggered
when the positional tolerance is exceeded.
The probe is in the hole or slot centre on completion of measurement.
Precondition:
The workpiece probe must be defined as type 30 (see Section 1.4.4).
Note:
Position determination in the linear axis can be carried out subsequently using cycle L977
(previously L982).
Example: Plane selection for searching for a hole/slot on the face:
G16 X C X Z
Example: Plane selection for searching for a hole/slot on the cylinder:
G16 C Z X Z
©
Siemens AG 1990 All Rights Reserved
SINUMERIK 840/850/880 (BN)
2nd length compensation
1st length compensation
Rotary axis
Linear axis
2nd length compensation
1st length compensation
Linear axis
Rotary axis
6FC5197- AB70

6 Measuring Cycles for Turning and Milling Work

6.1 L981 Searching for a hole/slot
6–1