Stopping Axis Feed on Fanuc Controls: Using RFO Parameter
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In most cases, if a machine with a Fanuc control is moving in rapid traverse, and the cutting feedrate over-ride is set to 0%, all axis motion stops. I’m not talking about the rapid traverse over-ride, but the feedrate over-ride switch.
Every now and then, I come across a machine that does not respond this way. The feedrate over-ride switch is set to 0%, but the axis will continue to move at a slow speed. I’m not sure why anyone would want this to be the case. I think most people would expect all motion to stop when the switch was set to 0%. If the motion does not stop completely and you thought that it had, a crash might occur.
Whether or not rapid feed continues with the feedrate over-ride switch set to 0% is based on the CNC parameter RFO. It is described in the Fanuc 16i parameter manual as follows:
1401.4: When cutting feedrate is 0% during rapid traverse, the machine tool does not stop moving (0)/ stops moving (1)
The Fanuc 15 control manual describes it as follows:
1401.3: Specifies whether to stop during rapid traverse when the cutting feedrate over-ride is set to 0%
0: Stop.
1: Do not stop.
Note: Notice that the 16i setting is “1″ to stop moving, and the 15 setting is “0″ to stop moving.
The Fanuc 0 control uses the parameter name STOVO (not RFO) and says the following:
393.5: If the cutting feedrate over-ride is 0% in rapid traverse, a stop does not occur/occurs. (it does not spell out whether 0 or 1 stops the motion or allows the motion. You’ll have to check that out for yourself).
I recently had a customer ask me about this and I received an email a few weeks ago asking the same question, so I thought this might be helpful.
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Tagged With cutting feedrate override, RFO, stop axis feed