HEIDENHAIN CNC Pilot 4290 - Manual (Page 149)

HEIDENHAIN CNC PILOT 4290 137
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
determines 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: Target 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: Not active.
■ Allowances are not considered.
Undercut according to 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
Undercut according to 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
Undercut angle for undercuts according to DIN 509 E and F: 15°
Transverse angle for an undercut according to DIN 509 F: 8°
I = depth of undercut
K = width of undercut
R = undercut radius
P = depth of end face
Undercut DIN 76 (thread undercut)
Undercut DIN 509 E
Undercut DIN 509 F
4.7 T
u
rning Cy
cles