GSK GSK988TA, Manual

Page: 133 / 531

Chapter 2 G Commands
115
Ⅰ
Programming
state, a spindle encoder should be fixed on the machine tool to machine the
workpiece.
F range in G98, G99
（
B set of G code is G94, G95
）
is shown below:
Address Incremental
system
Metric （ mm ） input
Inch (inch)input
ISB system
0
．
001
～
60000 (mm/min) 0.00001
～
2400 (inch/min) F
（
G98
）
ISC system
0.001
～
24000 (mm/min) 0.01
～
960 (inch/min)
ISB system
0.001 ～ 500 (mm/r) 0.0001 ～ 9.99 (inch/r) F （ G99 ）
ISC system
0.00001
～
960 (mm/r) 0.0001
～
9.99 (inch/r)
ISB system
1
～
60000 (mm/min) 0.01
～
2400 (inch/min) F
（
G98
）
ISC system
1
～
24000 (mm/min) 0.01
～
960 (inch/min)
ISB system
0.01
～
500 (mm/r) 0.01
～
9.99 (inch/r) F
（
G99
）
ISC system
0.01
～
500 (mm/r) 0.01
～
9.99 (inch/r)
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) .
F value is reserved after the system executes F code.
Note 1: G98, G99 are the modal G codes in the same group and only one is valid. G98 is the initial state G code
and the system defaults the modal can be set by No.3402 Bit4 (FPM) when the system turns on;
Note 2: In G99 mode, there is the uneven cutting feed rate when the spindle speed is lower than 1 r/min; there
is the follow error in the actual cutting feed rate when there is the swing in the spindle speed. To gain
the high machining quality, it is recommended that the selected spindle speed should be not lower
than min. speed of spindle servo or converter;
Note 3: No.1422 set the upper of the cutting feedrate. When the actual cutting feedrate (the value is multiplied
by the override) exceeds the specified upper limit, it is clamped to the upper limit value;
Note 4: No. 1403 Bit0(MIF)can set the cutting speed unit per minute and the detailed is referred to Ⅱ
Operation;
Note 5: When G99 instead of F code in G98 mode is executed, F is the previous modal value in G99. In a
similar way, when G98 instead of F code in G99 mode is executed, F is the previous modal value in
G98;
Note 6: When the initial mode is G98/99, and G99/G98 is alone executed after power on, the system runs at the
speed set by No. 1411.
2.23 Drilling/Boring Fixed Cycle Code
Many blocks completes one machining in the course of drilling. To simplify programming,
GSK988TA/TB uses one drilling cycle G codes to complete a series of drilling machining. (C tool
compensation vector in the course of drilling/boring will temporarily cancel, automatically recovers