Please Note While Programming - HEIDENHAIN TNC 640 User Manual

Fixed Cycles: Tapping / Thread Milling | RIGID TAPPING without a floating tap holder (Cycle 207,
DIN/ISO: G207)

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 DEPTH
determines the working direction. If you program
DEPTH=0, the cycle will not be executed.
It is possible to use the feed rate potentiometer during
tapping. The machine tool builder sets the configuration
(with parameter CfgThreadSpindle>sourceOverride)
for this purpose. The TNC then modifies the speed
accordingly.
The spindle speed potentiometer is inactive.
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!
If you enter a positive depth with a cycle, the TNC reverses
calculation of the pre-positioning. This means that the tool
moves at rapid traverse in the tool axis to set-up clearance
below the workpiece surface!
Enter depth as negative
Enter in machine parameter displayDepthErr (No. 201003)
whether the TNC should output an error message (on) or not
(off) if a positive depth is entered
HEIDENHAIN | User's manual for cycle programming | 10/2017
NOTICE
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