(2) Straight thread cutting cycle with angle
G92 X(U). ” z(w). . K“ F(E) --” ;
This command permits the thread cutting
alon the angle of thread .
A
The cycle ~
to ~ shown below is executed.
-x
F code (or E code)
Fig.2.58
The sign of figure following address K
decided by the direction of position A’
ed from position A.
ANGLE OF THREAD
a
-----
Y
.A
/(! -;
>
f“:~ 1-
1,10
-1+@
First cycle
~ ~ .4~/ “1, ,,
‘1’ CYc’e +/’
Second cycle
k
K
“a
IK,, I=
K,
Fig. 2.59
is
view–
DEPTH OF CUT
dn~n(;)
For the threading along the angle of thread,
the K for each cycle obtained from the above
formula should be programmed.
a
I
tan (s/2)
290
I
0.258618
30°
I
0.267949
550
I
0.520567
60°
I
0577350
60”
I
0.839100
EXAMPLE
T ‘x
I
76 !2
I
I
70. 111A
T
DIA
Angle of thread
~_6~”
Depth of Cut
d,=18mm
d,=25mrn
d,=lflmm
d. – 3.68 mm
=’
I
-+?-
Calculation of K. ..
K = d.tan(60°/2)
K1 = -1.8 x 0.57735 = -0.866 mm
K2 = -2.5 x 0.57735 = -1.443 mm
K3 = -3.1x 0.57735 =-1. 790mm
K4 = -3.68 x 0.57735 = -2.125 mm
N40 GOO X80. z76.2 MOO ;
N41 G92 x66.4 z25.4 K- O.87 F6. ;
N42 x65. K-1.44 ;
N43 x63.8 K-1.79 ;
N44 x62.64 K-2.13 ;
N45 GOO x1OO. z1OO. MAA ;
(3) Taper threading cycle
G92 X(U)-”” Z(w)””
The cycle @ to @
cuted by this command
1.. .
F(E) . . . ;
shown below is exe–
+.x
~
Speclfled by F code
(or E code)
1
&
~
+Z
!-L-’-3+
L
Details of Rapid
Fig. 2.60
TPfeadlng Pull-out
119
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