HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 158)

8 Programming: Cycles 142
8.1 General Information on Cycles
Frequently recurring machining cycles that comprise several
working steps are stored in the TNC memory as standard cycles.
Coordinate transformations and other special cycles are also
provided as standard cycles. The table at right lists the various cycle
groups.
Fixed cycles with number starting with 200 use Q parameters as
transfer parameters. Parameters with specific functions that are
required in several cycles always have the same number: For
example, Q200 is always assigned the setup clearance, Q202 the
plunging depth, etc.
Defining a cycle
ú The soft-key row shows the available groups of cycles
ú Press the soft key for the desired group of cycles, for
example DRILLING for the drilling cycles
ú Select the desired cycle, for example G83 PECKING.
The TNC initiates the programming dialog and asks all
required input values. At the same time a graphic of
the input parameters is displayed in the right screen
window. The parameter that is asked for in the dialog
prompt is highlighted
ú Enter all parameters asked by the TNC and conclude
each entry with the ENT key
ú The TNC terminates the dialog when all required data
have been entered
Example NC block
N50 G83 P01 +2 P02 -30 P03 +5 P04 1 P05 150 *
In order to be able to run cycles G83 to G86, G74 to G78
and G56 to G59 on older TNC models, you must program
an additional negative sign before the values for safety
clearance and plunging depth.
Group of Cycles Soft key
Cycles for pecking, reaming,
boring, back boring
and thread cutting
Cycles for milling pockets, studs
and slots
Cycles for producing hole patterns,
such as circular or linear patterns
SL (Subcontour List) cycles, which
allow the contour-parallel machining of
relatively complex contours consisting
of several overlapping subcontours,
cylinder surface interpolation (not TNC 410)
Cycles for face milling of flat or
twisted surfaces
Coordinate transformation cycles
which enable datum shift, rotation,
mirror image, enlarging and reducing
for various contours
Special cycles such as dwell time,
program call and oriented spindle stop
Tolerance (not TNC 410)
8.1 Gener
al Inf
or
mation on Cy
cles
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