HEIDENHAIN TNC 128 (77184x-02) - Manual (Page 420)

Drilling, boring and thread cycles
16.11 TAPPING with a floating tap holder (Cycle 206)
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TNC 128 | User's Manual HEIDENHAIN Conversational Programming | 5/2014
16.11 TAPPING with a floating tap holder
(Cycle 206)
Cycle run
1 The TNC positions the tool in the tool axis at rapid traverse
FMAX to the entered set-up clearance above the workpiece
surface.
2 The tool drills to the total hole depth in one movement.
3 Once the tool has reached the total hole depth, the direction of
spindle rotation is reversed and the tool is retracted to the set-
up clearance at the end of the dwell time. If programmed, the
tool moves to the 2nd set-up clearance at
FMAX.
4 At the set-up clearance, the direction of spindle rotation
reverses once again.
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.
A floating tap holder is required for tapping. It must
compensate the tolerances between feed rate and
spindle speed during the tapping process.
When a cycle is being run, the spindle speed override
knob is disabled. The feed-rate override knob is active
only within a limited range, which is defined by the
machine tool builder (refer to your machine manual).
For tapping right-hand threads activate the spindle
with
M3, for left-hand threads use M4.
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. In Cycle 206 the
TNC uses the programmed rotational speed and the
feed rate defined in the cycle to calculate the thread
pitch.
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!