HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 207)

191 HEIDENHAIN TNC 410, TNC 426, TNC 430
8.6 SL Cycles Group I
8.6 SL Cycles Group I
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
G37 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.
■ 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 G42.
■ The TNC recognizes an island if the tool path lies outside the
contour, for example if you machine the contour clockwise with
radius compensation G41.
■ 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
TNC 410:
With MP7420.0 and MP7420.1 you define how the TNC
should move the tool during area clearance (see ”14.1
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 G57). 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 G57) into
consideration
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