YASKAWA yasnac lx3 - Page 104

2,8.25.2 Stock Removal in Turning (G 71) (Cent’d)
Notes :
1.
The tool path of finishing shape should be
programmed to be monotonous increase or
decrease in X and Z coordinates.
2. The following should be taken into consider-
ation in programming the start block ( Nns)
and the end block (Nnf) of a finishing shape
program.
X MONOTONOUS
X MONOTONOUS
INCREASE
INCREASE
;pxq:,
!
“12&5iil
–x
11
.4~
t’1.--l
—--———_________
Nns
AA IS N
I
Speclf!ed
A’
~A;&LEL WITH :$:&
(2) Concaved finishing contour
a. Command format
ns: Sequence number farcyclestart
J ~ .,:
Sequence number forcyclef>nish
G71 PAS CJf u:. . . 12 . . . D.. F(E) S... R1 ;
~
lTI
T
Note 1
Note 2
Nns.. ;
Depth of cut m X-axisdirection
, F. ;
(designationwithoutsigns)
, s. . . . . ;
,~
L
L
Rough
finishingallowancem X-ares
directmn(radiusdesignation)
Finishingallowancein the directionof
...,,,
X-ax~s (diameterdesignation)
Note 1: Specifies the feed command (F(E))
and spindle command (S ) for the execution
of stock removal cycle.
Note 2:
Computes the cutting path for the
concaved finishing shape program if R 1 is
specified.
FCSIT:CNI
IRelr,]ct .GI
Shl FTED
/
FRC~J POINT
ABYu2-
r
‘--+ ---”-–j---+~j-, ,
1)
w%.
\
B ‘\
\
\
.1
‘:/
,.—~
\’\
:p<~ /‘
[Cti TTlh S,
‘i
id
\
,,/ pg~:;c,’ ~—~’~ $,,,
\
-x
\
\
/
L .— 21
A’
FINISHING
FINISHING ALLOWANCE
SHAPE
-+---
~i~<,s~,~~~~Af3E
— PL30GRAM
STOCK REMOVAL CYCLE
““””””””””””ROUGH FINISHING CYCLE
G71 starts at point A, executes the rough
cutting cycle (
—) and the rough finishing
cycle (---) ,
and returns to point A to be
terminated.
if I is not specified, the rough
finishing cycle is skipped.
lletracti~g ‘is per forrn~d by rapid traverse
GOO.
Thrust motion depends on the speed
( GOO or GO1) specified by the program of
AA’.
Each depth of cut D along X-axis
can be overrided by 10% step within the
range of O to 200%, by G71/G72 cut depth
override selection or setting.
See item (3) ,
g.
b. Cautions for concaved finishing shape pro-
gram
(i) Rough cutting cycle by G71 starts from
the closest concave to the start point.
COMMAND POINT
Cf FINALBL02K
Cf FINISHING
SHAPEPRffiRAM
@
23
B
A START
POINT
A’ COMMAND PO(NT
OF 1ST BLIXK OF
FINISHINGSHAPE
PRCGRAM
Nnf . . . . . . . . . ;J I_
Fnmshmg shape progrm (45blocksmaxmtum)
Toolpath: A + A! + B