Siemens SINUMERIK 880 Programming Manual page 115

05.91
Example: Thread on a tapered body
Lead h = 5 mm
Thread depth t = 1.73 mm; = 15°
Radial infeed direction
Both end point coordinates must be written.
The lead h is entered under K.
X
105
100
P4
P3
P6
D
W
Calculation of thread start and end point coordinates
(A, B, C, etc. are diameters)
1st cut P2...P3, t = 1 mm
2nd cut P5...P6, t = 1.73 mm
A = 70
B = A – 2t = 66.54
C = B – 2 · (5 · tan ) = 63.86
D = C+2 ·(70 · tan ) = 101.366
K = h = 5
I = h · tan =1.34 mm
Absolute position data input:
L F
N30 G90 S . . .
L F
N35 G00 X110 Z170
L F
N40 X65.86
N45 G33 X103.366 Z100. K5
L F
N50 G00 X110
L F
N55 Z170
L F
N60 X63.86
N65 G33 X101.366 Z100 K5
L F
N70 G00 X110
Calculation of points P2 and P3
X (P2) = C+2 mm = 65.86 mm
X (P3) = D+2 mm = 103.366 mm
© Siemens AG 1991 All Rights Reserved
SINUMERIK 880, (PG)
165
h
(K)
70
170
(P1)
(P2)
L F
(P3)
(P4)
(P1)
(P5)
L F
(P6)
(P4)
6ZB5 410-0HD02
4 Programming of Motion Blocks
4.3.2 Thread with constant lead
X=110
P1
Z=170
P2
t
P5
C B A=70
Z
4–57