HEIDENHAIN SW 548328-05 DIN Programming - Manual (Page 194)

194
DIN programming
4.2 Definition of w
or
k
piece blank
4.2 Definition of workpiece blank
Chuck part bar/tube G20-Geo
G20 defines the contour of a cylinder/hollow cylinder.
Cast part G21-Geo
G21 generates the contour of the blank part from the contour of the
finished part—plus the equidistant oversize P.
Example: G20-Geo
. . .
BLANK
N1 G20 X80 Z100 K2 I30 [hollow cylinder]
. . .
Parameters
X  Cylinder/hollow cylinder diameter
 Diameter of circumference of a polygonal blank
Z Length of the blank
K Right edge (distance between workpiece zero point and right
edge)
I Inside diameter of hollow cylinders
Example: G21-Geo
. . .
BLANK
N1 G21 P5 Q1 [cast blank]
. . .
FINISHED PART
N2 G0 X30 Z0
N3 G1 X50 BR-2
N4 G1 Z-40
N5 G1 X65
N6 G1 Z-70
. . .
Parameters
P Equidistant oversize (reference: finished part contour)
Q Bore hole Y/N (default: 0)
 0: Without hole
 1: With hole
G21 cannot be used to describe an "auxiliary blank."