GSK 988T, User Manual

Page: 103 / 416

Chapter
Ⅱ
G Commands
89
Ⅰ
Programming
X executes the cutting feed ( Δ i+e)again and executes
②
; after X cutting feed
( Δ i+e)is executed again, the end point of X cutting feed is on B
n
or is not on it
between A
n
and B
n
cutting feed to B
n
and then execute
④
;
④ Axial(Z) rapid tool retraction △ d （ radius value ） to C
n
, when Z coordinate of B
f
(cutting end point) is less than that of A (starting point), retract tool in Z positive,
otherwise, retract tool in Z negative direction;
⑤ Radial(X) rapid retract tool to Dn, No. n radial cutting cycle is completed. The
current radial cutting cycle is not the last one, execute
⑥
; if it is the previous one
before the last radial cutting cycle, execute
⑦
;
⑥ Axial(X)rapid tool infeed, and it direction is opposite to ④ retract tool. If the end
point of tool infeed is still on it between A and A
f
(starting point of last radial
cutting cycle) after Z tool infeed (
△
d+
△
k) (radius value), i.e. Dn → A
n+1
and then
execute
①
(start the next radial cutting cycle); if the end point of tool infeed is not
on it between D
n
and A
f
after Z tool infeed (
△
d+
△
k) , rapidly traverse to A
f
and
execute ① to start the first radial cutting cycle;
Z rapidly moves
⑦
to point A, G75 execution is completed.
Example
：
Fig.2-53
Fig.2-53 G75 cutting
Program
：
O0008
；
G00 X150 Z50 M3 S500
； （
Start spindle with 500 rev/min
）
G0 X125 Z-20
； （
Position to starting point of machining
）
G75 R0.5 F150
； （
Machining cycle
）
G75 X40 Z-50 P6000 Q3000
； （
X tool infeed 6mm every time, tool retraction 0.5mm, rapid
returning to starting point (X125) after infeeding to end
point (X40), Z tool infeed 3mm and cycle the
above-mentioned steps to continuously run programs
）
G0 X150 Z50
； （
Return to starting point of machining
）
M30
； （
End of program
）
2.15.7 Notes for multi cycle machining
Note 1. When the multi cycle blocks are executed, they should be the specified address P, Q, X, Z, U, W, R
of each block.
Note 2. The block specified by P in G71
，
G72, G73 should be G00G01. When there is no command, the
system alarms.