HEIDENHAIN TNC 640 (34059x-01) - Manual (Page 427)

HEIDENHAIN TNC 640 427
13.2 Basis F
unctions (Sof
tw
ar
e Option 50)
Programming undercutting
Undercutting is usually required for the flush connection of
counterparts. In addition undercutting can help to reduce the notch
effect at corners. Threads and fits are often machined with an
undercut. You have various contour elements for defining the different
undercuts:
„ UDC TYPE_E : Undercut for cylindrical surface to be further processed
in compliance with DIN 509
„ UDC TYPE_F : Undercut for plan and cylindrical surface for further
processing in compliance with DIN 509
„ UDC TYPE_H : Undercut for more rounded transition in compliance
with DIN 509
„ UDC TYPE_K : Undercut in face and cylindrical surface
„ UDC TYPE_U : Undercut in cylindrical surface
„ UDC THREAD : Thread undercut in compliance with DIN 76
Undercut DIN 509 UDC TYPE _E
Input elements in undercut DIN 509 UDC TYPE_E:
Undercut: depth = 2, width = 15
The TNC always interprets undercuts as form elements in
the longitudinal direction. No undercuts are possible in the
plane direction.
Input element Use Input
R Corner radius of both inner
corners Optional
DEPTH Undercut depth Optional
BREADTH Undercut width Optional
ANGLE Undercut angle Optional
21 L X+40 Z+0
22 L Z-30
23 23 UDC TYPE_E R1 DEPTH2 BREADTH15
24 L X+60