Siemens sinumerik 840D sl Operating Manual page 262

Programming technology functions (cycles)
8.1 Drilling
● With compensating chuck: CYCLE840
● Without compensating chuck: CYCLE84
When tapping with compensating chuck, the thread is produced in one cut. CYCLE84
enables tapping to be performed in several cuts, when the spindle is equipped with a
measuring system.
Approach/retraction - CYCLE840 - with compensating chuck
1. The tool moves with G0 to safety clearance of the reference point.
2. The tool drills with G1 and the programmed spindle speed and direction of rotation to
3. The direction of rotation is reversed.
4. Dwell time at final drilling depth.
5. Retraction to safety clearance with G1.
6. Reversal of direction of rotation or spindle stop.
7. Retraction to retraction plane with G0.
Approach/retraction - CYCLE84 - without compensating chuck
One cut:
1. Travel with G0 to the safety clearance of the reference point.
2. Spindle is synchronized and started with the programmed speed (dependent on %S).
3. Tapping with spindle-feedrate synchronization to Z1.
4. Spindle stop and dwell time at drilling depth.
5. Spindle reverse after dwell time has elapsed.
6. Retraction with active spindle retraction speed (dependent on %S) to safety clearance
7. Spindle stop.
8. Retraction to retraction plane with G0.
Approach/retraction during stock removal
1. The tool drills at the programmed spindle speed S (dependent on %S) as far as the first
2. Spindle stop and dwell time DT.
3. The tool retracts from the workpiece for the stock removal with spindle speed SR to the
4. Spindle stop and dwell time DT.
5. The tool then drills with spindle speed S as far as the next infeed depth.
6. Steps 2 to 5 are repeated until the programmed final drilling depth Z1 is reached.
7. On expiry of dwell time DT, the tool is retracted with spindle speed SR to the safety
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depth Z1. The feedrate F is calculated internally in the cycle from the speed and pitch.
infeed depth (maximum infeed depth D).
safety clearance.
clearance. The spindle stops and retracts to the retraction plane.
Operating Manual, 07/2010, 6FC5398-8CP40-0BA0
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