05.91 4 Programming of Motion Blocks
4.3.3 Thread with variable lead
4.3.3 Thread with variable lead
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The “Thread with variable lead”
function is an Option.
It is an integral part of spindle package E40 to E45.
The thread lead per turn is altered by the value programmed under address F until the maxi-
mum or minimum possible value is obtained.
G34 Lead increase:
N25 G34 G90 Z217. K2. F0.1
L
F
K2 Initial lead 2 mm
F0.1 Lead change + 0.1 mm per turn,
i.e. after 5 turns the lead is 2.5 mm
G35 Lead decrease:
N45 G35 G90 Z417. K10. F0.5
L
F
K10 Initial lead 10 mm
F0.5 Lead change 0.5 mm per turn,
i.e. after 10 turns the lead is 5 mm.
Value F is calculated from the initial and final lead and thread length:
F=
Initial lead
2
– Final lead
2
2 ·Thread length
The value F should be given without sign.
© Siemens AG 1991 All Rights Reserved 6ZB5 410-0HD02 4–59
SINUMERIK 880, (PG)
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