HEIDENHAIN CNC Pilot 4290 Pilot - Manual (Page 61)

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Undercut cycle G85
With the function G85, you can machine undercuts according to DIN
509 E, DIN 509 F and DIN 76 (thread undercut). The CNC PILOT
decides the type of undercut using ”K.” For undercut parameters, see
table.
The adjoining cylinder is machined if the tool is positioned at the
cylinder diameter (”X”) ”in front of” the cylinder.
The undercut roundings are executed with the radius 0.6 * I.
Parameters
X, Z: Destination point (X as diameter value)
I: Depth/wear allowance (radius)
■ DIN 509 E, F: wear allowance – default: 0
■ DIN 76: undercut depth
K: Undercut width and type
■ K no input: DIN 509 E
■ K=0: DIN 509 F
■ K>0: undercut length for DIN 76
E: Reduced feed (for machining the undercut) – no input: active
feed rate
• Cutter radius compensation: is not carried out
• Allowances: are not considered
Undercut DIN 76 (thread undercut)
Continued
Undercut DIN 509 E
Simple t
u
rning cy
cles