HEIDENHAIN TNC 128 (77184x-01) - Manual (Page 428)

428 Fixed cycles: Pocket milling / stud milling / slot milling
1
7.2 RECT
ANGULAR POCKET (Cy
c
le 251)
Please note while programming:
Pre-position the tool in the machining plane to the starting
position with radius compensation R0. Note parameter
Q367 (pocket position).
The TNC automatically pre-positions the tool in the tool
axis. Note parameter Q204 (2nd set-up clearance).
The algebraic sign for the cycle parameter DEPTH
determines the working direction. If you program
DEPTH=0, the cycle will not be executed.
At the end of the cycle, the TNC returns the tool to the
starting position.
At the end of a roughing operation, the TNC positions the
tool back to the pocket center at rapid traverse. The tool is
above the current pecking depth by the set-up clearance.
Enter the set-up clearance so that the tool cannot jam
because of chips.
Danger of collision!
Use the machine parameter displayDepthErr to define
whether, if a positive depth is entered, the TNC should
output an error message (on) or not (off).
Keep in mind that the TNC reverses the calculation for pre-
positioning when a positive depth is entered. This
means that the tool moves at rapid traverse in the tool axis
to set-up clearance below the workpiece surface!
If you call the cycle with machining operation 2 (only
finishing), then the TNC positions the tool in the center of
the pocket at rapid traverse to the first plunging depth.