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

PROGRAMMING
10. SPINDLE SPEED FUNCTION
(S FUNCTION)
B–62764EN/01
136
With this function, an overheat alarm (No. 704) is raised when the spindle
speed deviates from the specified speed due to machine conditions.
This function is useful, for example, for preventing the seizure of the
guide bushing.
G26 enables spindle speed fluctuation detection.
G25 disables spindle speed fluctuation detection.
G26 Pp Qq Rr ;
G25 ;
Spindle fluctuation detection on
Spindle fluctuation detection off
p : Time (in ms) from the issue of a new spindle rotation command (S
command) to the start of checking whether the actual spindle speed is
so fast that an overheat can occur.
When a specified speed is reached within the time period of P, a check
is started at that time.
q : Tolerance (%) of a specified spindle speed
q +
1–actual spindle speed
specified spindle speed
100
If a specified spindle speed lies within this range, it is regarded as
having reached the specified value. Then, the checking of an actual
spindle speed is started.
r : Spindle speed fluctuation (%) at which the actual spindle speed is so
fast that an overheat can occur
r +
1–speed that can cause overheat
specified spindle speed
100
G26 enables the spindle speed fluctuation detection function, and G25
disables the spindle speed fluctuation detection.
Even if G25 is specified, p, q, and r are not cleared.
10.4
SPINDLE SPEED
FLUCTUATION
DETECTION
FUNCTION (G25, G26)
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