HEIDENHAIN TNC 410 - Manual (Page 177)

8 Programming: Cycles 164
8.6 SL cycles
SL cycles allow the contour-oriented machining of complex
contours.
Characteristics of the contour
■ A contour can be composed of several overlapping subcontours
(up to 12 subcontours are possible). Islands and pockets can form
a subcontour.
■ The subcontour list (subprogram numbers) is entered in Cycle 14
CONTOUR GEOMETRY. The TNC calculates the contour from the
subcontours.
■ The individual subcontours are defined in subprograms.
■ The memory capacity for programming an SL cycle is limited. All
subprograms together can contain, for example, up to 128
straight-line blocks.
Characteristics of the subprograms
■ Coordinate transformations are allowed. When programmed
within subcontours, they are also effective for the following
subprograms, but do not need to be reset after the cyle has been
called.
■ The TNC ignores feed rates F and miscellaneous functions M.
■ The TNC recognizes a pocket if the tool path lies inside the
contour, for example if you machine the contour clockwise with
radius compensation RR.
■ The TNC recognizes an island if the tool path lies outside the
contour, for example if you machine the contour clockwise with
radius compensation RL.
■ The subprograms must not contain tool axis coordinates.
■ The working plane is defined in the first coordinate block of the
subprogram. Parallel axes are allowed.
Characteristics of the fixed cycles
With MP7420.0 and MP7420.1 you define how the TNC
should move the tool during area clearance (see ”15.1
General User Parameters”).
■ The TNC automatically positions the tool to the starting position
in the machining plane before a cycle. In the spindle axis the tool
must be pre-positioned to set-up clearance.
■ Each level of infeed depth is roughed-out axis-parallel or at a
preset angle (angle defined in Cycle 6). In the standard setting,
islands are traversed at safety clearance In MP7420.1 you can also
define that the TNC should rough-out individual pockets
separately, plunging only once for each pocket.
■ The TNC takes the entered finishing allowance (cycle 6) into
consideration
8.6 SL Cycles