Thread Centered - Siemens sinumerik 840D sl Operating Manual

Programming technology functions (cycles)
8.7 Further cycles and functions ShopTurn
Parameters Description
Clearance - (only for "stock removal" operation)
distance
Manual

Automatic

V3 Clearance distance – (for "manual" clearance distance only)
Dwell time in seconds
DT 
Dwell time in revolutions

8.7.2

Thread centered

Function
Using the "Centered tapping" cycle, tap a righthand or lefthand thread at the center of the
face surface.
During machining, either the main spindle or counterspindle rotates.You can alter the spindle
speed via the spindle override; feedrate override is not operative.
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
2. The direction of rotation of the spindle reverses and the tool retracts to the safety
Approach/retraction for stock removal
1. The tool drills in the direction of the longitudinal axis at the programmed spindle speed S
2. The tool retracts from the workpiece to the safety clearance at spindle speed SR or
3. Then the tool is inserted again at spindle speed S or feedrate V and drills to the next
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
430
or cutting rate V as far as the final drilling depth Z1.
clearance at the programmed spindle speed SR or cutting rate VR.
or feedrate V as far as the first infeed depth (maximum infeed depth D).
cutting rate VR for stock removal.
infeed depth.
clearance at spindle speed SR or cutting rate VR.
Operating Manual, 07/2010, 6FC5398-8CP40-0BA0
Unit
s
rev
Turning