Recess Turning With Direct Contour Input Unit - HEIDENHAIN CNC PILOT 640 User Manual

smart.Turn units | Units – Recessing

Recess turning with direct contour input unit

The unit machines the contour defined by the parameters axially
or 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
"Recess turning cycle G869", Page 331
Further information:
Contour form:
RI, RK: Oversize blank X and Z
Further parameters of the Contour form:
"Contour form", Page 80
Further information:
Cycle form:
P: Maximum infeed
I, K: O-size X and Z
RB: Depth compens. for finishing
B: Offset width (default: 0)
U: Direction: – cutting direction
0: Bidirectional (in both directions)
1: Unidirectional (in direction of contour)
Q: Roughing/Finish – process variants
0: Roughing and finishing
1: Only roughing
2: Only finishing
Further forms:
"smart.Turn unit", Page 78
Further information:
The control uses the tool definition to distinguish between radial
and axial recessing.
Depth compens. 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 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
precutting, the remaining material is removed with a single cut.
Access to the technology database:
Machining operation: Recessing
Affected parameters: F, S, O, P
HEIDENHAIN | User's Manual smart.Turn and DIN Programming | 12/2017
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