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

PROGRAMMING
5. FEED FUNCTIONS
B–62764EN/01
94
For internally offset circular cutting, the feedrate on a programmed path
is set to a specified feedrate (F) by specifying the circular cutting feedrate
with respect to F, as indicated below (Fig. 5.4.3.(a)). This function is
valid in the cutter compensation mode, regardless of the G62 code.
F
Rc
Rp
Rc : Cutter center path radius
Rp : Programmed radius
It is also valid for the dry run and the one–digit F command.
Rc
Rp
Programmed path
Cutter center
path
Fig. 5.4.3(a) Internal circular cutting feedrate change
If Rc is much smaller than Rp, Rc/Rp80; the tool stops. A minimum
deceleration ratio (MDR) is to be specified with parameter No. 1710.
When Rc/Rp
xMDR, the feedrate of the tool is (F×MDR).
NOTE
When internal circular cutting must be performed together with automatic override for inner
corners, the feedrate of the tool is as follows:
(automatic override for the inner corners)
×(feedrate override)
F
Rc
Rp
5.4.3
Internal Circular
Cutting Feedrate
Change

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