GSK GSK988TA, Manual

Page: 93 / 531

Chapter 2 G Commands
75
Ⅰ
Programming
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. G71 cannot be executed in MDI, otherwise, an alarm occurs.
Relevant definitions:
Finishing
path
As Fig. 2-36, Part (3) (ns
～
nf block)defines the finishing path, and the start point
of finishing path (start point of ns block)is the same these of start point and end
point of G71, called A point; the first block of finishing path(ns block)is used to 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 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 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
∆ d
It is each travel （ radius value ） of X tool infeed in roughing without sign symbols,
and the direction of tool infeed is defined by move direction of ns block. The
code value
∆ d is reserved after executing U （ ∆ d ） and the value of NO.5132 is
rewritten. The value of system parameter NO.5132 is regarded as the travel of
tool infeed when U
（
∆ d
）
is not input
e
It is travel
（
radius value
）
of X tool retraction in roughing
（
radius value
）
withoutsign
symbols, and the direction of tool retraction is opposite to that of tool infeed, the
code value e is reserved and the value of system parameter NO.5133 is
rewritten after R
（
e
）
is executed. 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 range is as the following table (diameter) with sign
symbols. X coordinate offset of roughing path compared to finishing path, i.e. the
different value of X absolute coordinates between A’ and A. The system defaults
∆ u=0 when U
（
∆ u
）
is not input, i.e. there is no X finishing allowance for roughing
cycle
∆ w
Z finishing allowance range is as the following table (diameter) with sign
symbols. X coordinate offset of roughing path compared to finishing path, i.e. the
different value of X absolute coordinates between A’ and A. The system defaults
∆ w=0 when U
（
∆ w
）
is not input, i.e. there is no Z finishing allowance for
roughing cycle
M, S
T, F
F ： Cutting feedrate; S: Spindle speed; T: Tool number, tool offset number
They can be specified in the first G71 or the second ones or program ns ～ nf. M,
S, T, F functions of M, S, T, F blocks are invalid in G71, and they are valid in only
G70 finishing blocks.