HEIDENHAIN MANUALplus 620 61
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 258)
The MANUALplus 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
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
MANUALplus reduces the programmed offset width. After precutting,
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: see page 48
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 (SS): Roughing and finishing
1 (SP): Only roughing
2 (SL): Only finishing
APP Approach: see page 51
Further forms: see page 46
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