HEIDENHAIN TNC 620 (340 56x-03) Cycle programming - Manual (Page 135)

HEIDENHAIN TNC 620 135
5.3 CIR
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Please note while programming:
With an inactive tool table you must always plunge
vertically (Q366=0) because you cannot define a plunging
angle.
Pre-position the tool in the machining plane to the starting
position (circle center) with radius compensation R0.
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.
The TNC outputs an error message during helical plunging
if the internally calculated diameter of the helix is smaller
than twice the tool diameter. If you are using a center-cut
tool, you can switch off this monitoring function via the
suppressPlungeErr
machine parameter.
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.