HEIDENHAIN TNC 407 (280 580) User Manual - Manual (Page 240)

8-33
8 Cycles
TNC 407/TNC 415 B/TNC 425
8.4 SL Cycles (Group II)
The SL cycles included in group II allow contour-oriented machining of
complex contours to achieve a particularly high degree of surface finish.
These cycles differ from those featured in group I in that:
• Before the cycle starts, the TNC automatically positions the tool to the
setup clearance.
• Each level of infeed depth is milled without interruptions since the
cutter traverses around islands instead of over them.
• The radius of "inside corners" can be programmed - the tool keeps
moving to prevent surface blemishes at inside corners (this applies for
the outermost pass during roughing and side finishing).
• The contour is approached in a tangential arc for side finishing.
• For floor finishing, the tool again approaches the workpiece in a tangen-
tial arc (for tool axis Z, for example, the arc may be in the Z/X plane).
• The contour is machined throughout in either climb or up-cut milling.
• MP 7420 is replaced by DIRECTION OF ROTATION Q9.
The machining data, such as milling depth, finishing allowance and setup
clearance, are entered as CONTOUR DATA in cycle 20.
There are four cycles for contour-oriented machining:
• PILOT DRILLING (cycle 21)
• ROUGH-OUT (cycle 22)
• FLOOR FINISHING (cycle 23)
• SIDE FINISHING (cycle 24)