HEIDENHAIN SW 548328-05 DIN Programming - Manual (Page 74)

74
smart.Turn units
2.3 Units—Recessing
"Recess turning with direct contour input" unit
The unit machines the contour defined by the parameters axially/
radially. The workpiece is machined by alternate recessing and
roughing movements. The machining process requires a minimum of
retraction and infeed movements.
Unit name: G869_G80 / Cycle: G869 (see page 278)
The Control uses the tool definition to distinguish between radial and
axial recessing.
Turning depth compensation RB:
Depending on factors such as
workpiece material or feed rate, the tool tip is displaced during a
turning operation. You can correct the resulting infeed error with the
turning depth compensation factor. The value is usually determined
empirically.
Offset width B:
After the second infeed movement, during the
transition from turning to recessing, the path to be machined is
reduced by the offset width B. Each time the system switches on this
side, the path is reduced by B—in addition to the previous offset. The
total offset is limited to 80 % of the effective cutting width (effective
cutting width = cutting width –2*cutting radius). If required, the
Control reduces the programmed offset width. After clearance
roughing, the remaining material is removed with a single cut.
Access to the technology database:
 Machining operation: Recess turning
 Affected parameters: F, S, O, P
Contour form:
RI, RK Workpiece blank oversize in X and Z direction
Further parameters of the contour form: see page 60.
Cycle form
P
Maximum infeed during rough turning
I, K Oversize in X, Z direction (I: diameter value)
RB Turning depth compensation for finishing
B Offset width
U Cutting direction
 0 (Bi): Bidirectional (in both directions)
 1 (Uni): Unidirectional (in direction of contour)
Q Sequence (roughing/finishing)
 0: Roughing and finishing
 1: Only roughing
 2: Only finishing
Further forms: see page 58