Siemens SINUMERIK 880 GA2

05.91 4 Programming of Motion Blocks
4.3.3 Thread with variable lead
Example:
Flank infeed, longitudinal thread with constant lead
78
5025
22
P1
P2
P6
P3
P5
W
X
Z
P4
37.4 38.7 40
X= 46 Z=80.483
Lead h = 2 mm
Thread depth t = 1.3 mm
Infeed angle e= 60°
X
1
= (46-38.7)/2 = 3.65
Z
1
= X
1
·tan e/2 = 2.136
X
2
= 3.65+1.3/2 = 4.3
Z
2
= X
2
·tan e/2 = 2.483
Absolute position data input:
N30 G90 S . . .
L
F
N35 G00 X46 Z80.483
L
F
(P1)
N40 X38.7 Z78.347
L
F
(P2)
N45 G33 Z22 K2
L
F
(P3)
N50 G00 X46
L
F
(P4)
N55 Z80.483
L
F
(P1)
N60 X37.4 Z78
L
F
(P5)
N65 G33 Z22 K2
L
F
(P6)
N70 G00 X46
L
F
(P4)
© Siemens AG 1991 All Rights Reserved 6ZB5 410-0HD02 4–61
SINUMERIK 880, (PG)