GSK GSK988TA, Manual

Page: 99 / 531

Chapter 2 G Commands
81
Ⅰ
Programming
increasing or reducing) for the finishing path;
5. In ns ～ nf blocks, there are only G codes: 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 codes;
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
the start point of finishing path (i.e. start point of ns block)is the same these of
start point and end point of G72, called A point; the first block of finishing
path(ns block)is used for Z rapid traversing or cutting feed, and the end point of
finishing path is called to B point; the end point of finishing path(end point of nf
block)is called to C point. The finishing path is A
→ B → C
Roughing
path
The finishing path is the one after offsetting the finishing allowance
（
∆ u, ∆ w
）
and is the path contour formed by executing G72. A, B, C point of finishing path
after offset corresponds separately to A’, B’, C’point of roughing path, and the
final continuous cutting path of G72 is B’ → C’ point
∆ d
It is each travel of Z tool infeed in roughing without sign symbols, and the
direction of tool infeed is defined by move direction of ns block. ∆ d is reserved
after the system executes W （ ∆ d ） and NO.5132 value is modified. The value of
system parameter NO.05132 is regarded as the travel of tool infeed when W
（ ∆ d ） is not input
e
It is each travel of Z tool infeed in roughing without sign symbols, and the
direction of tool retraction is opposite to that of tool infeed; after R(e) is
executed, e value e is reserved and the system modifies No.5133 value. The
value of system parameter NO.5133 is regarded as the travel of tool retraction
when R
（ e ） is not input
ns Block number of the first block of finishing path
nf Block number of the last block of finishing path
∆ u
X finishing allowance in roughing, (X coordinate offset of roughing path
compared to finishing path, i.e. the different value of X absolute coordinate
between A’and A, diameter value with sign symbols)
∆ w
Z finishing allowance in roughing, its value: -9999.999~9999.999 ( Z coordinate
offset of roughing path compared to finishing path, i.e. the different value of X
absolute coordinates between A’ and A, with sign symbols)