Undercuts In Turning Technology - Siemens SINUMERIK 840D Operator's Manual

6
"Program" Operating Area
6.5 Free contour programming

6.5.7 Undercuts in turning technology

Restrictions
Operation
6-290
The form E and F undercut and form DIN 76 and general thread
undercut functions are only activated when turning technology is
enabled. The display machine data MD 9020: TECHNOLOGY is
analyzed to determine the technology.
Form E and F undercuts as well as thread undercuts are only
available if level G18 is set. Undercuts are only permitted on contour
edges of the rotational body, which run in the direction of the
longitudinal axis (usually parallel to the Z axis). The longitudinal axis is
identified by the machine data. The machine data MD 20100:
DIAMETER_AX_DEF for turning machines contains the name of the
transverse axis (usually X). The other axis in G18 is the longitudinal
axis (usually Z). If MD 20100: DIAMETER_AX_DEF does not contain
a name that conforms to G18, there are no undercuts.
Undercuts only appear on corners between horizontal and vertical
straight lines, including any straight lines, which are at 0°, 90°, 180° or
270°. A tolerance of +/- 3° is required here, so that conical threads are
also possible (however, the undercuts do not meet the standard in this
case).
When the operator focus is on "Trans. to following element", use the
Select key or softkey "Alternative" to select Undercut.
When the focus is on the following field, the undercut form can be
defined. The Select key and softkey "Alternative" can be used to
select the following options:
Form E
Form F
DIN 76 thread
General thread
SINUMERIK 840D/840Di/810D Operator's Guide HMI Advanced (BAD) – 03.04 Edition
6
03.04
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