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Chapter 3 G Commands
163
Ⅰ
Programming
the rotation function
：
R a p id tra v e rs e
T h re a d c u ttin g
D :E n d p o in t o f th re a d c u ttin g
C :S ta rtin g p o in t o f th re a d c u ttin g
B :R e fe re n c e p o in t o f th re a d c u ttin g d e p th
A :S ta rtin g p o in t
（
E n d p o in t
）
E
A
e
A
f
A
n
A
1
A
B
C
D
E
u /2
i
r
w
B
1
B
n
B
f
B
e
α
/2
k
d
△
d
n
△
d
X
Z
A 1 ,A n
,
A f
,
A e :S ta rt p o s itio n
3.24 Constant Surface Speed Control G96, Constant Rotational
Speed Control G97
The detailed is referred to Section 2.2.3.
3.25 Feedrate per Minute G98, Feedrate per Rev G99
Command format:
G98 F_; (its range is referred to Section 1.6.5, the leading zero can be
omitted, feed rate per minute is specified, mm/min)
Command function:
cutting feed rate is specified as mm/min, G98 is the modal G command.
G98 cannot be input if the current command is G98 modal.
Command format:
G99 F_; (its range is referred to Section 1.6.5, the leading zero can be
omitted)
Command function:
Cutting feed rate is specified as mm/min, G99 is the modal G command.
G99 input may be omitted if current state is G99. The actual cutting
feedrate is gotten by multiplying the F command value (mm/r) to the
current spindle speed(r/min). If the spindle speed varies, the actual
feedrate changes too. If the spindle cutting feed amount per rev is
specified by G99 FXXXX , the even cutting texture on the surface of
workpiece will be gotten. In G99 state, a spindle encoder should be fixed
on the machine tool to machine the workpiece.
G98, G99 are the modal G commands in the same group and only one is valid. G98 is the initial state
G command and the system defaults G98 is valid when the system turns on.
Reduction formula of feed between per rev and per min:
F
m
= F
r
×S
F
m
: feed per min (mm/min) ;
F
r
: feed per rev (mm/r) ;
S: spindle speed (r/min) .
After the system turns on, the feedrate is ones set by
№
030 and F value is reserved after F is
executed. The feed rate is 0 after F0 is executed. F value is reserved when the system resets and
