Contour Finishing G890 - HEIDENHAIN CNC PILOT 640 User Manual

DIN/ISO programming | Contour-based turning cycles

Contour finishing G890

G890 finishes the defined contour area in one pass. The reference
to the contour to be machined can be transferred in the cycle
parameters, or the contour can be defined directly after the cycle call.
"Working with contour-based cycles", Page 315
Further information:
The contour to be machined can contain various valleys. If required,
the area to be machined is divided into several sections.
In Machine Parameter 602322, you define whether the
control is to check the usable length of the cutting edge
during finishing. For recessing and button tools, the length
of the cutting edge is not checked.
Parameters:
ID: Auxiliary contour – ID number of the contour to be machined
NS: Starting block no. of contour – beginning of contour section
NE: Contour end block no. – end of contour section
NE not programmed: The contour element NS is machined in
the direction of contour definition
NS = NE programmed: The contour element NS is machined
opposite to the direction of contour definition.
E: Plunging behavior
No input: Automatic feed-rate reduction
E = 0: No plunging
E > 0: Plunging feed rate in use
V: Machine form elements (default: 0)
A chamfer/rounding arc is machined
0: At beginning and end
1: At beginning
2: At end
3: No machining
4: Only chamfer/rounding is machined—not the base
element (requirement: the contour section consists of a single
element)
Q: Start t. (default: 0)
0: Automatic – the control checks:
Diagonal approach
First X, then Z direction
Equidistant around the barrier
Omission of the first contour elements if the starting
position is inaccessible
1: First X, then Z
2: First Z, then X
3: No approach – tool is located near the starting point of the
contour area
4: Finish rem. mat.
HEIDENHAIN | User's Manual smart.Turn and DIN Programming | 12/2017
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