Siemens SINUMERIK 808D User Manual page 165

Programming and operating manual (milling)
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VR T (variable retraction value for chip breakage with VARI=0)
You can program the retraction path for chip breaking.
D TD (dwell time at final drilling depth)
The dwell time at final drilling depth can be entered in seconds or revolutions.
D IS1 (programmable limit distance for VARI=1)
The limit distance after re-insertion in the hole can be programmed.
The limit distance is calculated within the cycle as follows:
● Up to a drilling depth of 30 mm, the value is set to 0.6 mm.
● For larger drilling depths, the limit distance is the result of
(RFP + SDIS - current depth) / 50. If this calculated value >7, a limit of 7 mm, maximum, is applied.
Programming example 1: Deep-hole drilling
This program executes the cycle CYCLE83 at the positions X80 Y120 and X80 Y60 in the XY plane. The first drill hole is
drilled with a dwell time zero and machining type chip breaking. The final drilling depth and the first drilling depth are entered
as absolute values. In the second cycle call, a dwell time of 1 s is programmed. Machining type chip removal is selected, the
final drilling depth is relative to the reference plane. The drilling axis in both cases is the Z axis.
N10 G0 G17 G90 F50 S500 M4
N20 D1 T12
N30 Z155
N40 X80 Y120
N50 CYCLE83(20,0,3,-15,,-6,,1,1,1,1,0,3,4,3,1,2)
N60 X80 Y60
N70 CYCLE83(20,0,3,-15,,-6,,1,1,1,1,0,3,4,3,1,2)
N80 M02
Programming and Operating Manual (Milling)
6FC5398-4DP10-0BA6, 09/2017
; Specification of technology values
; Approach retraction plane
; Approach first drilling position
; Call of cycle; depth parameters with
absolute values
; Approach next drilling position
; Cycle call with relative data for final
drilling depth and first drilling depth;
the safety clearance is 1 mm and the
feedrate factor is 0.5
; End of program
165

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