Siemens SINUMERIK 840D, Operating Manual, Page: 269 / 610

Programming technological functions (cycles)
8.1 Drilling
Milling
Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
269
Parameter Description Unit
Drilling depth 
Shank (drilling depth in relation to the shank)
The drill is inserted into the workpiece until the drill shank reaches the value
programmed for Z1. The angle entered in the tool list is taken into account.
 Tip (drilling depth in relation to the tip)
The drill is inserted into the workpiece until the drill tip reaches the value
programmed for Z1.
Z1 Drilling depth (abs) or drilling depth in relation to Z0 (inc)
It is inserted into the workpiece until it reaches Z1. mm
DT 
Dwell time (at final drilling depth) in seconds

Dwell time (at final drilling depth) in revolutions
s
rev
8.1.4 Reaming (CYCLE85)
Function
With the "Reaming" cycle, the tool is inserted in the workpiece with the programmed spindle
speed and the feedrate programmed at F.
If Z1 has been reached and the dwell time expired, the reamer is retracted at the
programmed retraction feedrate to the retraction plane.
Approach/retraction
1. The tool moves with G0 to safety clearance of the reference point.
2. The tool is inserted into the workpiece with the programmed feedrate F until it reaches
the final depth Z1.
3. Dwell time DT at final drilling depth.
4. Retraction to retraction plane with programmed retraction feedrate FR.
Procedure
1. The part program or ShopMill program to be processed has been
created and you are in the editor.
2. Press the "Drilling" softkey.
3. Press the "Drilling Reaming" softkey.
4. Press the "Reaming" softkey
The "Reaming" input window opens.