HEIDENHAIN TNC 640, User Manual, Page: 698 / 948

Turning | Turning program functions (option 50)
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HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
Programming recessing
Recessing is the machining of recesses in round components,
usually for accommodation of locking rings and seals or as
lubricating grooves. You can program recessing around the
circumference or on the face end of the turned part. For this you
have two separate contour elements:
GRV RADIAL
: Recess in circumference of component
GRV AXIAL
: Recess on face end of component
Input parameters in recessing
GRV
Input parameters Application Input
CENTER
Center of recess Required
R
Corner radius of both
inner corners Optional
DEPTH
/
DIAM
Recess depth (pay
attention to the sign!) /
diameter of recess base Required
BREADTH
Recess width Required
ANGLE
/
ANG_WIDTH
Edge angle / aperture
angle of both edges Optional
RND
/
CHF
Curve / chamfer corner
of contour near to start-
ing point Optional
FAR_RND
/
FAR_CHF
Curve / chamfer corner
of contour away from
starting point Optional
The algebraic sign for the recess depth specifies the
machining position (inside/outside machining) of the
recess.
Algebraic sign of recess depth for outside machining:
If the contour element is in the negative direction of
the Z coordinate, use a negative sign
If the contour element is in the positive direction of
the Z coordinate, use a positive sign
Algebraic sign of recess depth for inside machining:
If the contour element is in the negative direction of
the Z coordinate, use a positive sign
If the contour element is in the positive direction of
the Z coordinate, use a negative sign
Example: Radial recess with depth=5, width=10, pos.= Z-15
21 L X+40 Z+0
22 L Z-30
23 GRV RADIAL CENTER-15 DEPTH-5 BREADTH10 CHF1 FAR_CHF1
24 L X+60