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

4
Fixed Cycles: Tapping / Thread Milling
4.3 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.
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.
The feed-rate override knob is disabled.
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
entered.
traverse in the tool axis to set-up clearance
the workpiece surface!
98
positive depth is
This means that the tool moves at rapid
below
HEIDENHAIN | TNC 320 | User's manual for cycle programming | 9/2016