Undercut Type H G857; Undercut Type K G858 - HEIDENHAIN CNC PILOT 640 User Manual

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Undercut type H G857

G857 machines an undercut. The end point is determined from the
Plunging angle in accordance with Undercut form H.
Tool position at the end of the cycle: Cycle starting point
Parameters:
X: Edge (diameter value)
Z: Edge
K: Undercut lgth.
R: Radius (no input: no circular element; tool radius = undercut
radius)
W: Plunging angle (default: W is calculated)
Undercuts can only be executed in orthogonal,
paraxial contour corners along the longitudinal axis
Cutter radius compensation is active
Oversizes are not offset
Example: G857
%857.nc
N1 T2 G95 F0.23 G96 S248 M3
N2 G0 X60 Z2
N3 G857 X50 Z-30 K7 R2 W30
END

Undercut type K G858

G858 machines an undercut. This cycle performs only one linear
cut at an angle of 45°. The resulting contour geometry therefore
depends on the tool that is used.
Tool position at the end of the cycle: Cycle starting point
Parameters:
X: Edge (diameter value)
Z: Edge
I: Undercut depth
Undercuts can only be executed in orthogonal,
paraxial contour corners along the longitudinal axis
Cutter radius compensation is active
Oversizes are not offset
Example: G858
%858.nc
N1 T9 G95 F0.23 G96 S248 M3
N2 G0 X60 Z2
N3 G858 X50 Z-30 I0.5
END
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DIN/ISO programming | Undercut cycles
HEIDENHAIN | User's Manual smart.Turn and DIN Programming | 12/2017