Chapter
Ⅱ
G Commands
73
Ⅰ
Programming
⑵
2nd blocks for defining the block interval, finishing allowance;
⑶
3rd blocks for some continuous finishing path, counting the roughing path without being
executed actually when G72 is executed.
According to the finishing path, the finishing allowance, the path of tool infeed and retract
tool, the system automatically counts the path of roughing
,
the tool cuts the workpiece in
paralleling with Z, and the roughing is completed by multiple executing the cutting cycle
tool infeed
→
cutting feed
→
tool retraction. The starting point and the end point of G72 are
the same one. The command is applied to the formed roughing of non-formed rod.
Command format
:
G72 W
(
Δ
d
)
R
(
e
)
F S T
;
⑴
G72 P
(
ns
)
Q
(
nf
)
U
(
Δ
u
)
W
(
Δ
w
);
⑵
N
(
ns
)
.....;
........;
....
F
;
....
S
;
....;
⑶
·
N
(
nf
)
..
.
..;
Command specifications:
1. ns
~
nf blocks in programming must be followed G72 blocks. If they are in the front of G72
blocks, the system automatically searches and executes ns
~
nf blocks, and then executes
the
next program following nf block after they are executed, which causes the system executes
ns
~
nf blocks repetitively;
2. ns
~
nf blocks are used for counting the roughing path and the blocks are not executed
when G72 is executed. F, S, T commands of ns
~
nf blocks are invalid when G72 is
executed, at the moment, F, S, T commands of G72 blocks are valid. F, S, T of ns
~
nf
blocks are valid when executing ns
~
nf to command G70 finishing cycle;
3. There are G00,G01 without the word X(U) in ns block, otherwise the system alarms;
4. X,Z dimensions in finishing path(ns
~
nf blocks) must be changed monotonously (always
increasing or reducing) for the finishing path;
5. In ns
~
nf blocks, there are only G commands: G01, G02, G03, G04, G96, G97, G98, G99,
G40, G41,G42 and the system cannot call subprograms(M98/M99);
6. G96, G97, G98, G99, G40, G41, G42 are invalid in G72 and valid in G70;
7. When G72 is executed, the system can stop the automatic run and manual traverse, but
return to the position before manual traversing when G72 is executed again, otherwise, the
following path will be wrong;
8. When the system is executing the feed hold or single block, the program pauses after the
system has executed end point of current path;
9. d
△
,
u are specified by the same U and different with or without being specified P,Q
△
commands;
10. G72 cannot be executed in MDI, otherwise, the system alarms.
Relevant definitions:
Finishing path the above-mentioned Part
⑶
of G71
(
ns
~
nf block)defines the finishing path, and
Summary of Contents for 988T
Page 6: ...GSK988T Turning CNC System User Manual VI ...
Page 14: ...GSK988T Turning CNC System User Manual XIV ...
Page 15: ...Chapter 1 Programming Fundamentals 1 Ⅰ Programming Ⅰ PROGRAMMING ...
Page 16: ...GSK988T Turning CNC System User Manual 2 Ⅰ Programming ...
Page 194: ...GSK988T Turning CNC System User Manual 180 Ⅰ Programming ...
Page 195: ...Chapter Ⅰ Overview 181 Ⅱ Operation Ⅱ OPERATION ...
Page 196: ...GSK988T Turning CNC System User Manual 182 Ⅱ Operation ...
Page 217: ...Chapter Ⅲ Windows 203 Ⅱ Operation ...
Page 267: ...Chapter Ⅲ Windows 253 Ⅱ Operation Fig 3 51 Fig 3 52 ...