Please Note While Programming - HEIDENHAIN TNC 620 User Manual

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Fixed Cycles: Pocket Milling / Stud Milling / Slot Milling | RECTANGULAR POCKET (Cycle 251, DIN/ISO:

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 with radius compensation R0. Note
parameter Q367 (position).
The TNC automatically pre-positions the tool in the tool
axis. Observe 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
(No. 201006).
The TNC reduces the infeed depth to the LCUTS tool
length defined in the tool table if the tool length is
shorter than the Q202 infeed depth programmed in the
cycle.
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HEIDENHAIN | TNC 620 | User's manual for cycle programming | 10/2017
G251, software option 19)