Please Note While Programming - HEIDENHAIN TNC 320 User's Manual For Cycle Programming

4
TAPPING WITH CHIP BREAKING (Cycle 209, DIN/ISO: G209) 4.4

Please note while programming:

Machine and TNC must be specially prepared by the
machine tool builder for use of this cycle.
This cycle is effective only for machines with servo-
controlled spindle.
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 "thread
depth" determines the working direction.
The TNC calculates the feed rate from the spindle
speed. If the feed-rate override is used during
tapping, the TNC automatically adjusts the feed rate.
With the parameter
CfgThreadSpindle>sourceOverride you can set
whether the potentiometer for the feed rate is in
effect during thread cutting or not.
If you defined an rpm factor for fast retraction in
cycle parameter Q403, the TNC limits the speed to
the maximum speed of the active gear range.
If you program M3 (or M4) before this cycle, the
spindle rotates after the end of the cycle (at the
speed programmed in the TOOL CALL block).
If you do not program M3 (or M4) before this cycle,
the spindle stands still after the end of the cycle.
Then you must restart the spindle with M3 (or M4)
before the next operation.
If you enter the thread pitch of the tap in the Pitch
column of the tool table, the TNC compares the
thread pitch from the tool table with the thread
pitch defined in the cycle. The TNC displays an error
message if the values do not match.
Danger of collision!
Enter in machine parameter displayDepthErr
whether the TNC should output an error message
(on) or not (off) if a positive depth is entered.
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 320 | User's manual for cycle programming | 9/2016