HEIDENHAIN TNC 640 User Manual page 648

16
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
CENTER
R
DEPTH / DIAM
BREADTH
ANGLE / ANG_WIDTH
RND / CHF
FAR_RND / FAR_CHF
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
N30 G01 X+40 Z+0*
N40 G01 Z-30*
N50 GRV RADIAL CENTER-15 DEPTH-5 BREADTH10 CHF1
FAR_CHF1*
N60 G01 X+60*
648
Application
Center of recess
Corner radius of both
inner corners
Recess depth (pay
attention to the sign!) /
diameter of recess base
Recess width
Edge angle / aperture
angle of both edges
Curve / chamfer corner
of contour near to start-
ing point
Curve / chamfer corner
of contour away from
starting point
Turning | Turning program functions (option 50)
Input
Required
Optional
Required
Required
Optional
Optional
Optional
HEIDENHAIN | TNC 640 | ISO Programming User's Manual | 10/2017