Siemens SINUMERIK 840D Programming Manual page 82

2
Drilling Cycles and Drilling Patterns
2.1 Drilling cycles
The incremental drilling depth for one pass is
specified via parameter _DAM. The cycle internally
calculates the intermediate depth as follows:
• The programmed incremental depth is drilled in each
pass until the remaining distance to the final drilling
depth is < than 2 * _DAM
• The remaining depth is halved and drilled in 2
passes, thereby ensuring that the minimum
drilling depth is not less than _DAM/2.
Further notes
The direction of rotation is always reversed
automatically for tapping in cycle.
Programming example
Rigid tapping
A thread is tapped without a compensating chuck at
position X30 and Y35 in the XY plane, the tapping
axis is the Z axis. No dwell time is programmed. The
depth is programmed as a relative value. The
parameters for the direction of rotation and the pitch
must be assigned values. A metric thread M5 is
tapped.
N10 G0 G90 T4 D1
N20 G17 X30 Y35 Z40
N30 CYCLE84 (40, 36, 2, , 30, , 3, 5, ->
->, 90, 200, 500)
N40 M30
-> Must be programmed in a single block
2-82
Y
A
B
30
Specification of technology values
Traverse to drilling position
Cycle call, parameter PIT has been
omitted, no value is entered for the
absolute depth or the dwell time. Spindle
stop at 90 degrees, speed for tapping is
200, speed for retraction is 500
End of program
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
2
03.96
09.01
Y
A - B
X
Z
6
36
© Siemens AG, 2002. All rights reserved