DIN/ISO programming | Undercut cycles
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HEIDENHAIN | User's Manual smart.Turn and DIN Programming | 12/2017
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4.21 Undercut cycles
Undercut cycle G85
G85 machines undercuts according to DIN 509 E, DIN 509 F and
DIN 76 (thread undercut).
Parameters:
X: Diameter
Z: Target point
I: Grind. o./Depth (radius value)
DIN 509 E, F: Finishing oversize (default: 0)
DIN 76: Undercut depth
K: Undercut lgth. and type of undercut
K no input: DIN 509 E
K = 0: DIN 509 F
K > 0: Undercut width for DIN 76
E: Reduc. Feed for machining the undercut (default: active feed
rate)
G85 machines the adjoining cylinder if you position the tool to
Destinat. point X in front of the cylinder.
The undercut rounding arcs are executed with the radius 0.6 * I.
Parameters for Undercut DIN 509 E
Diameter I K R
<= 18 0.25 2 0.6
> 18 – 80 0.35 2.5 0.6
> 80 0.45 4 1
Parameters for Undercut DIN 509 F
Diameter I K R P
<= 18 0.25 2 0.6 0.1
> 18 – 80 0.35 2.5 0.6 0.2
> 80 0.45 4 1 0.3
I = Undercut depth
K = Undercut length
R = Undercut radius
P = Surf. depth
Undercut angle according to Undercut DIN 509 E and
Undercut DIN 509 F: 15°
Face angle according to Undercut DIN 509 F: 8°
Tool radius compensation is inactive
Oversizes are not offset
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