Siemens SINUMERIK 808D Programming And Operating Manual page 30

Manual machining
3.2 Display and operator control options in the main screen
Changing the operating sequences spindle type "S"
By pressing the <Cursor keys>, you go to the display field which contains the currently
programmed spindle type (with an orange background).
Figure 3-9
By pressing the toggle key <SELECT>, you can choose one of the following spindle types:
● Constant spindle speed (rpm)
● Constant cutting rate (m/min)
30
Spindle type
This value defines the programmed spindle speed for machining with "Spindle speed +
Time feed" or "Spindle speed + Revolutional feedrate".
The constant spindle speed is achieved only if no speed reduction is programmed by
means of spindle override weighting or with spindle setting data.
Cutting speed input value for machining with "Cutting speed + revolutional feedrate". The
spindle speed is adjusted to the machining diameter of the workpiece so that uniform
cutting conditions are achieved.
Since the spindle would (in simple mathematical terms) have to rotate at an "infinitely
high" speed at the rotational center point in this mode, this speed is limited in the spindle
setting data by the input value "MR".
The constant cutting speed can also be influenced by means of the feedrate and spindle
override weighting settings.
CAUTION
The feedrate or spindle type can only be changed if all axes and the spindle are
stationary.
Programming and Operating Manual, 12/2012, 6FC5398-3DP10-0BA0
Manual Machine Plus (Turning)