FANUC Series 16/18/160/180-Model C Machining Center Operators Manual

PROGRAMMING
B–62764EN/01
5. FEED FUNCTIONS
87
G93 is a modal G code and belongs to group 05 (includes G95 (feed per
revolution) and G94 (feed per minute)).
When an F value is specified in G93 mode and the feedrate exceeds the
maximum cutting feedrate, the feedrate is clamped to the maximum
cutting feedrate.
In the case of circular interpolation, the feedrate is calculated not from the
actual amount of movement in the block but from the arc radius. This
means that actual machining time is longer when the arc radius is longer
than the arc distance and shorter when the arc radius is shorter than the arc
distance. Inverse time feed can also be used for cutting feed in a canned
cycle.Notes
NOTE
1 In the G93 mode, an F code is not handled as a modal code and
therefore needs to be specified in each block. If an F code is not
specified, P/S alarm (No. 11 (indicating that cutting feedrate
specification is missing)) is issued.
2 When F0 is specified in G93 mode, P/S alarm (No. 11 (indicating
that cutting feedrate specification is missing)) is issued.
3 Inverse time feed cannot be used when PMC axis control is in
effect.
4 If the calculated cutting feedrate is smaller than the allowable
range, P/S alarm (No. 11 (indicating that cutting feedrate
specification is missing)) is issued.

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