HEIDENHAIN CNC Pilot 4290 Pilot - Manual (Page 63)

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Recessing G86
G86 machines simple radial and axial recesses with chamfers. From the
tool position the CNC PILOT calculates a radial/axial or an inside/outside
recess.
If you program an allowance, the control always rough-machines the
recess first. In the second step, the recess is then finish-machined.
G86 machines chamfers at the sides of the recess. If you do not wish
to cut the chamfers, you must position the tool at a sufficient distance
from the workpiece. Calculation of the starting position XS (diameter):
XS = XK + 2 * (1,3 – b)
XK: Contour diameter
b:
Chamfer width
Tool position at end of cycle:
■ Radial recess: X – Starting position; Z – last recess position
■ Axial recess: X – last recess position; Z – start position
Parameters
X, Z: Target point (X diameter)
Radial recess:
I:
Allowance
■ I>0: Allowance (roughing and finishing)
■ I=0: No finishing
K: Recess width – no input: a single cut is machined (recess width
= tool width)
Simple t
u
rning cy
cles
Axial recess:
I:
Recess width – no input: a single cut is
machined (recess width = tool width)
K: Allowance
■ K>0: Allowance (roughing and finishing)
■ K=0: No finishing
E Period of dwell (dwell time for chip breaking) –
default: Duration of on revolution
■ With finishing allowance: Only for finishing
■ Without finishing allowance: for every
recess
• Cutter radius compensation: is not
carried out
• Allowances are not considered.