Siemens SINUMERIK 808D User Manual page 36

Parameters
Parameter Description
Reference (z0) Start position for the drill hole in the longitudinal axis
(absolute position of Z axis)
Drilling depth (l) Enter the thread length here. The tapping direction is always towards the chuck and cannot be
reversed. The choice of a left-hand or right-hand thread depends on the direction of rotation of the
spindle and the thread tapping tool.
Lead (s) Enter the thread pitch here.
With compensating Depending on the manufacturer, you can select as to whether the machining is carried-out with or
chuck/Rigid tapping without compensating chuck.
Tapping operation
The machining sequence is as follows:
1. Starting from the current axis position, the tool is traversed to the cycle start point in the longitudinal axis. This is
calculated internally from the value for the "Reference z0" parameter (taking into account the clearance distance).
2. The transverse axis is positioned to the center of rotation.
3. The controller then waits (at the cycle start point) for the next zero mark of the spindle encoder in order to start the axis
movement in the longitudinal axis (defined thread start point).
4. When the thread length (end point) is reached, the spindle and longitudinal axis change direction and withdraw the
tapping tool from the drill hole again.
5. The longitudinal axis then stops at the cycle start point and the spindle changes direction again. The spindle is now
running in the direction in which it was originally started.
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2. You can access the manual tapping function by pressing this softkey in the drilling cycle
overview.
Alternatively, you can select this function with cursor keys and activate it with this hardkey.
Programming and Operating Manual (Manual Machine Plus (MM+), Turning)
01/2017