7 sl cycles group ii (not tnc 410), 7 sl cy cles gr oup ii (not in tnc 41 0) – HEIDENHAIN TNC 426B (280 472) ISO programming User Manual
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HEIDENHAIN TNC 410, TNC 426, TNC 430
8.7 SL Cycles Group II (not TNC 410)
SL cycles allow the contour-oriented machining of complex
contours and achieve a particularly high degree of surface finish.
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. The secondary axes U,V,W are permitted.
Characteristics of the fixed cycles
■
The TNC automatically positions the tool to 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.
■
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 in the Rough-out and Side-
Finishing cycles).
■
The contour is approached in a tangential arc for side finishing.
■
For floor finishing, the tool again approaches the workpiece in 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 G121 to G124.
8.7 SL Cy
cles
Gr
oup II (not in
TNC 41
0)
Kkap8.pm6
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