Siemens SINUMERIK 828D Turning, Руководство по эксплуатации функций

Страница: 1379 / 1799

V1: Feedrates
17.2 Path feedrate F
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
1379
The absolute value of F must be applied to
G34
or
G35
according to the desired lead increase or lead decrease.
When the thread length l
G
, lead change
F
and initial lead k
a
are known, the lead increase at the end of block k
e
can be determined as follows by modifying the formula:
•
G34
(progressive lead):
•
G35
(degressive lead):
Sample program
Thread cutting
G33
with degressive thread lead
G35
Suppress special alarms
Any lead changes that would overload the thread axis when
G34
is active or would result in an axis standstill
when
G35
is active are detected in advance during block preparation.
Alarm 10604 "Thread lead increase too high" or alarm 10605 "Thread lead decrease too high" are output if bit 10
in machine data:
MD11410 SUPPRESS_ALARM_MASK
is not set.
During thread cutting, certain practical applications require a correction of the spindle speed. In this case, the
operator will base his correction on the permissible velocity of the thread axis.
Note
If the formula results in a negative root expression, the thread cannot be machined!
In this case, the NC signals alarm 10605 or alarm 22275.
N1608 M3 S10 ; Spindle speed
N1609 G0 G64 Z40 X216 ; Approach starting point
N1610 G33 Z0 K100 SF=R14 ; Thread with constant pitch 100 mm/rev
N1611 G35 Z-220 K100 F17.045455 ; Thread lead decrease 17.045455 mm/rev2
; Thread lead at end of block 50 mm/rev
N1612 G33 Z-240 K50 ; Traverse thread block without jerk
N1613 G0 X218 ;
N1614 G0 Z40 ;
N1616 M17 ;
N
H
N
D
)O
*
N
H
N
D
)O
*