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Constant Surface Speed (CSS)/Direct RPM
Operation (900 With CSS and I/O Options)
If your DRO has the CSS option, you can use the DAC (Digital/Analog Converter) output
voltage to control the spindle speed. You can use this feature in Lathe Mode to obtain a
constant surface speed as the tool changes the workpiece diameter.
Use the following F-codes to operate the CSS feature:
F 48 CSS/Direct RPM Input
F 50 DAC Output Voltage On/Off
NOTE: The CSS feature must be set up properly.
NOTE: Do not start the spindle with the DRO (For example, using F 50). The machine
should have a separate switch for this purpose.
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