HEIDENHAIN TNC 426, User Manual

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202 8 Programming: Cycles
8.1 W
o
rk
ing with Cy
cles
8.1 Working with 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 (see table on next page).
Fixed cycles with numbers 200 and over 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 set-up clearance, Q202 the plunging depth, etc.
Defining a cycle using soft keys
U The soft-key row shows the available groups of cycles
U Press the soft key for the desired group of cycles, for
example DRILLING for the drilling cycles
U Select the desired cycle, for example THREAD
MILLING. 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
U Enter all parameters asked by the TNC and conclude
each entry with the ENT key
U The TNC terminates the dialog when all required data
have been entered
Defining a cycle using the GOTO function
U The soft-key row shows the available groups of cycles
U The TNC shows an overview of cycles in a window.
Use the arrow keys to select the desired cycle, or
enter the cycle number. Confirm with ENT. The TNC
then initiates the cycle dialog as described above.