Siemens SINUMERIK 840D sl Turning Operating Manual page 629

You can select drilling in one cut, chipbreaking or retraction from the workpiece for stock
removal.
The tool is moved with rapid traverse to the programmed position, allowing for the retraction
plane and safety clearance.
Approach/retraction in one cut
1. The tool drills in the direction of the longitudinal axis at the programmed spindle speed S or
cutting rate V as far as the final drilling depth Z1.
2. The direction of rotation of the spindle reverses and the tool retracts to the safety clearance
at the programmed spindle speed SR or cutting rate VR.
Approach/retraction for stock removal
1. The tool drills in the direction of the longitudinal axis at the programmed spindle speed S or
feedrate V as far as the first infeed depth (maximum infeed depth D).
2. The tool retracts from the workpiece to the safety clearance at spindle speed SR or cutting
rate VR for stock removal.
3. Then the tool is inserted again at spindle speed S or feedrate V and drills to the next infeed
depth.
4. Steps 2 and 3 are repeated until the programmed final drilling depth Z1 is reached.
5. The direction of rotation of the spindle reverses and the tool retracts to the safety clearance
at spindle speed SR or cutting rate VR.
Approach/retraction for chipbreaking
1. The tool drills in the direction of the longitudinal axis at the programmed spindle speed S or
feedrate V as far as the first infeed depth (maximum infeed depth D).
2. The tool retracts by the retraction clearance V2 for chipbreaking.
3. The tool then drills to the next infeed depth at spindle speed S or feedrate V.
4. Steps 2 and 3 are repeated until the programmed final drilling depth Z1 is reached.
5. The direction of rotation of the spindle reverses and the tool retracts to the safety clearance
at spindle speed SR or cutting rate VR.
The machine manufacturer may have made specific settings for centered tapping in a machine
data element.
Turning
Operating Manual, 06/2019, A5E44903486B AB
Machine manufacturer
Please refer to the machine manufacturer's specifications.
Programming technology functions (cycles)
10.7 Additional cycles and functions in ShopTurn
629