GSK GSK988TA, Manual

Page: 111 / 531

Chapter 2 G Commands
93
Ⅰ
Programming
Fig.2-50 G74 path
Code execution process: Fig. 2-50.
① Z △ executes the axial cutting feed k from the start point of axial cutting cycle An. When Z
coordinate of cutting end point is less than that of the start point, Z negatively feeds, otherwise,
Z positively feed;
②
Z executes the axial tool retraction e rapidly, and its tool retraction direction is opposite to the
feed direction of Step ;
①
③ When Z executes feed cutting ( ∆ k+e) again, and the feed end point is still between the axial
cutting cycle starting point An and the axial tool infeed end point Bn. It executes the cutting
feed (
∆ k+e) again, and executes the Step
②
; after Z executes the cutting feed ( ∆ k+e)
，
its feed
end point reaches Bn or is not between An and Bn
，
Z executes the cutting feed to Bn
，
and
execute the Step
④ ；
④ X executes the radial tool retraction
△
d （ radius value ） rapidly to Cn. When X coordinate of
cutting end point Bf is less than that of the start point A, X positively executes tool retraction,
otherwise, Z executes negatively tool retraction;
⑤
Z executes the axial tool retraction to Dn rapidly, and the n times cutting cycle ends. When the
current is not the last axial cutting cycle, the system executes the Step
⑥
; when the current is
the last axial cutting cycle, the system executes the Step ⑦ ;
⑥
X executes the rapid tool infeed, and its infeed direction is opposite to the Step
④
. After X
executes the tool infeed
△ △
( d+ i)
（
radius value
），
the tool infeed end point is still between A
and Af (it is the start point of the last axial cutting cycle), X executes the rapid tool infeed
W