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CSS/Direct RPM Input
(900 With CSS and I/O Options) – F 48
F 48 allows you to specify the desired Constant Surface Speed (CSS), which is entered
in Feet per Minute (INCH Mode) or Meters per Minute (MM Mode). The DRO maintains
the specified constant surface speed as the diameter of the workpiece changes. You can
specify a maximum spindle speed (MAX SPEED) to restrict the spindle speed from
exceeding this speed as the diameter decreases, or a specific spindle speed (DIRECT
RPM) to maintain the spindle speed at a constant RPM.
To program a CSS operation:
1. Select a tool by using the Tool Offset.
2. Press
The DRO displays the following in the message window:
Max speed
NOTE: You can limit the spindle speed to either the top speed (preset spindle speed at
maximum DAC output voltage) or the specified maximum speed (MAX SPEED),
whichever is lower.
To limit the spindle speed (For example, to 2500 RPM):
3. Press
NOTE: The decimal point at the left of the X-axis display will blink if the spindle speed is
limited by MAX SPEED.
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