CYCLE81 Drilling Cycle on Sinumerik 840D Turning – Expert Guide

Sinumerik CYCLE81 Drilling, Centering cycle for CNC machinists who work on CNC lathe/turning machine with Siemens Sinumerik CNC control.

Drilling cycle CYCLE81 works on Sinumerik 840D, Sinumerik 808D and similar cnc controls.

Sinumerik CYCLE81 Drilling Cycle for CNC Mill

For CNC machinists who work on CNC Mill with Siemens Sinumerik 840D/808D CNC controls Drilling Cycle CYCLE81 is briefly explained here

Sinumerik 840D CYCLE81 Drilling Centering Cycle Programming

Sinumerik Turning/Lathe Drilling Centering Cycle CYCLE81

With Sinumerik CYCLE81 the tool drills at the programmed spindle speed and feed-rate to the specified final drilling
depth.

CYCLE81 Drilling Cycle – Sinumeirk 840D Turning

CYCLE81 (RTP, RFP, SDIS, DP, DPR)

RTP  – Return plane or Retraction plane (absolute)
RFP  – Reference plane (absolute)
SDIS – Safety distance (enter without sign)
DP    – Final drilling depth (absolute)
DPR – Final drilling depth relative to reference plane (enter without sign)

Drilling depth can be given either as
Absolute depth (DP) or
Relative to reference plane depth (DPR).

Sinumerik Turning/Lathe Drilling Centering Cycle CYCLE81 Working

As the above figure shows
1: drill will rapidly reach the start point (RFP + SDIS).
2: with given feed-rate will complete final drilling depth (DP).
3: after completing the depth the tool will retract rapidly to Return plane (RTP)