Please Note While Programming - HEIDENHAIN TNC 620 User Manual

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BORE MILLING (Cycle 208) 3.9

Please note while programming:

Program a positioning block for the starting point
(hole center) in the working plane with radius
compensation R0.
The algebraic sign for the cycle parameter DEPTH
determines the working direction. If you program
DEPTH=0, the cycle will not be executed.
If you have entered the bore hole diameter to be
the same as the tool diameter, the TNC will bore
directly to the entered depth without any helical
interpolation.
An active mirror function does not influence the type
of milling defined in the cycle.
Note that if the infeed distance is too large, the tool
or the workpiece may be damaged.
To prevent the infeeds from being too large, enter
the maximum plunge angle of the tool in the ANGLE
column of the tool table. The TNC then automatically
calculates the max. infeed permitted and changes
your entered value accordingly.
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!
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HEIDENHAIN | TNC 620 | User's manual for cycle programming | 9/2015