GSK 988T, Руководство пользователя

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Chapter
Ⅱ
G Commands
79
Ⅰ
Programming
roughing, and Z cutting direction is opposite to the sign symbol of Δ k: Δ k ＞ 0, cut in
Z negative direction in roughing. It is reserved after Δ k command value is
executed and the system rewrites No.5136 value. NO.5136 value is regarded as
the travel of X tool retraction of roughing when W
（
Δ k
）
is not input.
d It is the cutting times and its range is referred to the following table. R5 means the
closed cutting cycle is completed by 5 times cutting. R
（
d
）
is reserved after it is
executed and the system rewrites NO.5137. The value of system parameter
NO.5137 is regarded as the cutting times when R
（
d is not input.
ns Block number of the first block of finishing path.
nf Block number of the last block of finishing path.
Δ u It is X finishing allowance as the following table (diameter value with sign
symbols ) and is the X coordinate offset of roughing contour compared to finishing
path, i.e. the different value of X absolute coordinates of A
1
compared to A. Δ u
＞
0
，
it is the offset of the last X positive roughing path compared to finishing path. The
system defaults
Δ u=0 when U
（
Δ u
）
is not input, i.e. there is no X finishing
allowance for roughing cycle.
Δ w It is Z finishing allowance as the following table -99.999~99.999 (unit: mm ) and is
the Z coordinate offset of roughing contour compared to finishing path, i.e. the
different value of Z absolute coordinate of A
1
compared to A. Δ w
＞
0
，
it is the offset
of the last roughing path compared to finishing path in Z positive direction. The
system defaults
Δ w=0 when W
（
Δ w
）
is not input, i.e. there is no Z finishing
allowance for roughing cycle.
F Feedrate; S: Spindle speed; T: Tool number, tool offset number.
M, S, T, F
They can be specified in the first G73 or the second ones or program ns ～ nf. M, S,
T, F functions of M, S, T, F blocks are invalid in G73, and they are valid in G70
finishing blocks.
Address Incremental system
Metric （ mm ） input
Inch (inch) input
ISB system
-99999.999
～
99999.999 mm -9999.9999
～
9999.9999 inch U
（
Δ i
）
ISC system
-9999.9999
～
9999.9999 mm -999.99999
～
999.99999 inch
ISB system
-99999.999 ～ 99999.999 mm -9999.9999 ～ 9999.9999 inch W （ Δ k ）
ISC system
-9999.9999
～
9999.9999 mm -999.99999
～
999.99999 inch
R
（
d
）
ISB, ISC
1
～
999
（
times
）
1
～
999
（
times
）
ISB system
-99999.999 ～ 99999.999 mm -9999.9999 ～ 9999.9999 inch U ( Δ u ）
ISC system
-9999.9999
～
9999.9999 mm -999.99999
～
999.99999 inch
ISB system
-99999.999
～
99999.999 mm -9999.9999
～
9999.9999 inch W
（
Δ w
）
ISC system
-9999.9999 ～ 9999.9999 mm -999.99999 ～ 999.99999 inch
Execution process:(Fig. 2-40).
① A → A
1
： Rapid traverse ；
②
First roughing A
1
→ B
1
→ C
1
：
A
1
→ B
1
： Rapid traverse speed in ns block in G0, cutting feedrate specified by G73 in ns
block in G1
；