HEIDENHAIN CNC PILOT 640 - Casting G21-Geo; Chuck Part Bar or Tube G20-Geo; Definition of Workpiece Blank

DIN/ISO programming | Definition of workpiece blank
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HEIDENHAIN | User's Manual smart.Turn and DIN Programming | 12/2017
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4.2 Definition of workpiece blank
Chuck part bar or tube G20-Geo
G20 defines the contour of a cylinder or hollow cylinder.
Parameters:
X: Diameter
Cylinder/hollow cylinder diameter
Diameter of circumference of a polygonal blank
Z: Length of workpiece blank
K: Righthnd edge – distance between workpiece datum and
right edge
I: Diam. inside
Example: G20-Geo
. . .
BLANK
N1 G20 X80 Z100 K2 I30
. . .
Casting G21-Geo
G21 generates the contour of the blank part from the contour of
the finished part—plus the equidistant Ov.size P.
Parameters:
P: Equidistant Allowance (reference: finished part contour)
Q: Boring Y/N (default: 0)
0: No
1: Yes
G21cannot be used to describe an auxiliary blank.
Example: G21-Geo
. . .
BLANK
N1 G21 P5 Q1
. . .
FINISHED PART
N2 G0 X30 Z0
N3 G1 X50 BR-2
N4 G1 Z-40
N5 G1 X65
N6 G1 Z-70
. . .