HEIDENHAIN TNC 640 (34059x-04) - Manual (Page 482)

Programming: Turning Operations
14.2 Basis Functions (Software Option 50)
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TNC 640 | User's Manual
HEIDENHAIN Conversational Programming | 3/2014
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 ends 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 elements in recessing GRV
Input element Application Input
CENTER Center of recess Required
R Corner radius of both
inner corners
Optional
DEPTH / DIAM Recess depth (pay
attention to the
algebraic 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
starting 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 of the recess (inside/outside
machining).
Algebraic sign of recess depth for outside machining:
Use a negative sign when the contour element
runs in a negative direction to the Z coordinate
Use a positive sign when the contour element
runs in a positive direction to the Z coordinate
Algebraic sign of recess depth for inside machining:
Use a positive sign when the contour element
runs in a negative direction to the Z coordinate
Use a negative sign when the contour element
runs in a positive direction to the Z coordinate
Radial recess: 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