Cycles
2.4 Drilling cycles
Turning Part 2: Programming (Siemens instructions)
112 Programming and Operating Manual, 05/2012, 6FC5398-5DP10-0BA0
2.4.3 Drilling, centering - CYCLE81
Programming
CYCLE81 (RTP, RFP, SDIS, DP, DPR)
Parameters
Parameter Data type Description
RTP REAL Retraction plane (absolute)
RFP REAL Reference plane (absolute)
SDIS REAL Safety clearance (enter without sign)
DP REAL Final drilling depth (absolute)
DPR REAL Final drilling depth relative to the reference plane (enter without sign)
Function
The tool drills at the programmed spindle speed and feedrate to the entered final drilling
depth.
Sequence
Position reached prior to cycle start:
The drilling position is the position in the two axes of the selected plane.
The cycle creates the following sequence of motions:
Approach of the reference plane brought forward by the safety clearance by using G0
● Traversing to the final drilling depth at the feedrate programmed in the calling program
(G1)
● Retraction to the retraction plane with G0
Explanation of the parameters
RFP and RTP (reference plane and retraction plane)
Normally, reference plane (RFP) and return plane (RTP) have different values. The cycle
assumes that the retraction plane precedes the reference plane. This means that the
distance from the retraction plane to the final drilling depth is larger than the distance from
the reference plane to the final drilling depth.
SDIS (safety clearance)
The safety clearance (SDIS) acts with reference to the reference plane. This is brought
forward by the safety clearance.
The direction in which the safety clearance is active is automatically determined by the cycle.
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