Siemens Sinumerik 802D sl Programming Manual page 42

Commands Calling Axis Movements
2.2 Using the thread cutting function
Margin for incomplete thread portions (δ1, δ2)
At the start and end of thread cutting, lead error is generated. Therefore, margins
and δ
δ
1 2
Fig. 2-19
Notice
Keep the spindle speed at the same value until one thread is cut. If the spindle
speed is not maintained constant, accuracy could be lost due to servo lag.
Notice
During thread cutting, override operation and feed hold operation are disregarded.
If G33 is specified in the G94 (feed per minute) mode, an alarm occurs.
2-42
should be given at the start and end portions in thread cutting.
+X
δ
2
Margins for incomplete threads
SINUMERIK 802D sl/840D sl840D/840Di sl/840Di/810D ISO Turning -- 04.07 Edition
δ
1
+Z
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04.07