Please Note While Programming - HEIDENHAIN TNC 620 User Manual

4
Fixed Cycles: Tapping / Thread Milling
4.2 TAPPING with a floating tap holder (Cycle 206)

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
entered. This means that the tool moves at rapid
traverse in the tool axis to set-up clearance
the workpiece surface!
102
positive depth is
below
HEIDENHAIN | TNC 620 | User's manual for cycle programming | 9/2015