
PROGRAMMING
B–61404E/08
5. FEED FUNCTIONS
58
Cutting feedrate can be controlled, as indicated in Table 5.4.
Table 5.4 Cutting feedrate control
Function name
G code Validity of G code Description
Exact stop G09
This function is valid for specified
blocks only.
The tool is decelerated at the end point of
a block, then an in–position check is made.
Then the next block is executed.
Exact stop G61
Once specified, this function is valid
until G62, G63, or G64 is specified.
The tool is decelerated at the end point of
a block, then an in–position check is made.
Then the next block is executed.
Cutting mode G64
Once specified, this function is valid
until G61, G62, or G63 is specified.
The tool is not decelerated at the end point
of a block, but the next block is executed.
Tapping mode G63
Once specified, this function is valid
until G61, G62, or G64 is specified.
The tool is not decelerated at the end point
of a block, but the next block is executed.
When G63 is specified, feedrate override
and feed hold are invalid.
Automatic
corner
override
Automatic override
for inner corners
G62
Once specified, this function is valid
until G61, G63, or G64 is specified.
When the tool moves along an inner
corner during cutter compensation, over-
ride is applied to the cutting feedrate to
suppress the amount of cutting per unit of
time so that a good surface finish can be
produced.
Internal circular
cutting feedrate
change
–
This function is valid in the cutter
compensation mode, regardless of
the G code.
The internal circular cutting feedrate is
changed.
NOTE
1 The purpose of in–position check is to check that the servo
motor has reached within a specified range (specified with
a parameter by the machine tool builder). In–position check
can be disabled by setting bit 5 of parameter No. 020 to 1.
2 Inner corner angle q: 2°
< q x a x 178°
(a is a set value)
q
Workpiece
Tool
5.4
CUTTING FEEDRATE
CONTROL