288 ISO Programming
4.21 Undercut Cycles
Undercut according to DIN 76 with cylinder
machining G853
G853 machines the adjoining cylinder, the undercut, and finishes with
the plane surface. It also machines a cylinder start chamfer when you
enter at least one of the parameters Cut-in length (1st cut length)
or Cut-in radius (1st cut radius).
Parameters that are not programmed are automatically calculated
from the standard table:
FP from the diameter
I, K, W, and R from FP (thread pitch)
Example: G853
%853.nc
[G853]
N1 T2 G95 F0.23 G96 S248 M3
N2 G0 X60 Z2
N3 G853 FP1.5 I47 K15 W30 R2 P1 B5 RB2 WB30
E0.2 H1
N4 G0 X50 Z0
N5 G1 Z-30
N6 G1 X60
N7 G80
END
Parameters
FP Thread pitch
I Undercut depth (default: value from standard table)
K Undercut length (default: value from standard table)
W Undercut angle (default: value from standard table)
R Undercut radius (default: value from standard table)
POversize:
P is not defined: The undercut is machined in one pass
P is defined: Division into pre-turning and finish-turning
– P = longitudinal oversize; the transverse oversize is preset
to 0.1 mm
B Cut-in length (1st cut length)—no input: No chamfer
machined at start of cylinder
RB Cut-in radius (1st cut radius)—no input: 1st cut radius is not
machined
WB Cut-in angle (1st cut angle) (default: 45°)
E Reduced feed for machining the undercut (default: active feed
rate)
H Type of departure (default: 0):
0: Tool returns to the starting point
1: Tool remains at the end of the plane surface
To Next Page
Loading...
Need help?
General
