Continuous Thread Cutting - Siemens Sinumerik 802D sl Programming Manual

04.07
2.2.2

Continuous thread cutting

Since the NC has buffer register, designation for continuous thread cutting is possi-
ble. In addition, continuous threads can be cut smoothly because the block-to-block
pause time is "0" for thread cutting command blocks.
Example of programming
G33 X (U) ⋅⋅⋅ Z (W) ⋅⋅⋅ F ⋅⋅⋅ ;
G33 X (U) ⋅⋅⋅ Z (W) ⋅⋅⋅ ;
G33 X (U) ⋅⋅⋅ Z (W) ⋅⋅⋅ ;
·
·
·
(a) Reinforced pipe coupling
Fig. 2-18
Notice
If designation of thread lead (F) is changed during thread cutting cycle, lead
accuracy is lost at joints of blocks. Therefore, thread lead designation must not be
changed during thread cutting cycle.
If continuous thread cutting is specified, M codes must not be specified. If an
M code is specified, the cycle is suspended at the specified block and continuous
thread cannot be cut.
© SIEMENS AG 2007 All rights reserved
SINUMERIK 802D sl/840D sl840D/840Di sl/840Di/810D ISO Turning -- 04.07 Edition
A
B
Continuous thread cutting
Commands Calling Axis Movements
2.2 Using the thread cutting function
A
B
C
C
B
(b) Worm screw
A
2-41