HEIDENHAIN TNC 640 User Manual page 159

Fundamentals, File Management | Creating and writing programs
Cylindrical blank
The cylindrical blank form is defined by the dimensions of the
cylinder:
X, Y or Z: Rotation axis
D, R: Diameter or radius of the cylinder (with positive algebraic
sign)
L: Length of the cylinder (with positive algebraic sign)
DIST: Shifting along the rotational axis
DI, RI: Inside diameter or inside radius for a hollow cylinder
The parameters DIST and RI or DI are optional and need
not be programmed.
Example
%NEW G71 *
N10 BLK FORM CYLINDER Z R50 L105 DIST+5 RI10*
N99999999 %NEW G71 *
Rotationally symmetric blank of any shape
You define the contour of the rotationally symmetric blank in a
subprogram. Use X, Y or Z as the rotation axis.
In the workpiece blank definition you refer to the contour
description:
DIM_D, DIM-R: Diameter or radius of the rotationally
symmetrical blank form
LBL: Subprogram with the contour description
The contour description may contain negative values in the rotation
axis but only positive values in the reference axis. The contour
must be closed, i.e. the contour beginning corresponds to the
contour end.
If you define a rotationally symmetric blank with incremental
coordinates, the dimensions are then independent of the diameter
programming.
The subprogram can be designated with a number, an
alphanumeric name, or a QS parameter.
HEIDENHAIN | TNC 640 | ISO Programming User's Manual | 10/2017
Program begin, name, unit of measure
Spindle axis, radius, length, distance, inside radius
Program end, name, unit of measure
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