GSK 980TDi, User Manual

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Chapter 3 G Commands
107
Ⅰ
Programming
3.22.1 Axial Roughing Cycle G71
G71 has two kinds of roughing cycle: type I and type II.
Command format ： G71 U( Δ d) R(e) F S T ； ⑴
G71 P(ns) Q(nf) U( Δ u) W( Δ w) K0/1 J0/1
； ⑵
N(ns) G0/G1 X(U) ．．； N(ns) G0/G1 X(U) Z(W)… ；
．．．．．．．．； ．．．．．．．．；
．．．． F ； ．．．． F ；
．．．．
S
；
Type I
⑶ ．．．．
S
；
Type II
⑶
．．．． ．．
N(nf)
．．．．．；
N(nf)
．．．．．；
Command function: G71 is divided into three parts:
1st blocks for defining the travels of tool infeed and retract tool, the cutting feedrate, the
⑴
spindle speed and the tool function when roughing;
2nd blocks for defining the block interval, finishing allowance;
⑵
3rd blocks for some continuous finishing path, counting the roughing path without being
⑶
executed actually when executing G71.
According to the finishing path, the finishing allowance, the path of tool infeed and tool retract,
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 → tool
retraction. The starting point and the end point are the same one. The command is applied to the
formed roughing of non-formed rod.
Relevant definitions:
Finishing path: The above-mentioned Part 3 of G71 ( ns
～
nf block)defines the finishing path, and
the starting point of finishing path (starting point of ns block)is the same these of
starting point and end point of G71, called A point; the first block of finishing
path(ns block)is used for X rapid traversing or tool infeed, 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( Δ u, Δ w) and
is the path contour formed by executing G71. 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 G71 is B’
→ C’ point.
Δ d: It is each travel of X tool infeed in roughing, its value: 0.001~99.999
（
IS_B
）
/0.0001~99.9999
（ IS_C ） (unit: mm/inch,radius value) without sign, and the direction of tool infeed is defined
by move direction of ns block. The command value Δ d is reserved after executing U( Δ d).
The value of system parameter No.051 is regarded as the travel of tool infeed when U( Δ d) is
not input.
e: It is travel of X tool retraction in roughing its value: 0~99.999
（
IS_B
）
/0~99.9999
（
IS_C
）
(unit:
mm/inch,radius value) without sign, and the direction of tool retraction is opposite to that of tool
infeed, the command value e is reserved after R(e) is executed. The value of system
parameter No.052 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.