HEIDENHAIN ITNC 530 User Manual page 398

Characteristics of the fixed cycles
The TNC automatically positions the tool to the set-up clearance
before a cycle.
Each level of infeed depth is milled without interruptions since the
cutter traverses around islands instead of over them.
In order to avoid leaving dwell marks, the TNC inserts a globally
definable rounding radius at non-tangential inside corners. The
rounding radius, which is entered in Cycle 20, affects the tool center
point path, meaning that it would increase a rounding defined by the
tool radius (applies to rough-out and side finishing).
The contour is approached on a tangential arc for side finishing.
For floor finishing, the tool again approaches the workpiece on a
tangential 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.
With MP7420 you can determine where the tool is
positioned at the end of Cycles 21 to 24.
The machining data (such as milling depth, finishing allowance and
set-up clearance) are entered as CONTOUR DATA in Cycle 20.
398 8 Programming: Cycles