HEIDENHAIN TNC 128 (77184x-02) - Manual (Page 414)

Drilling, boring and thread cycles
16.9 SINGLE-LIP DEEP-HOLE DRILLING (Cycle 241)
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TNC 128 | User's Manual HEIDENHAIN Conversational Programming | 5/2014
16.9 SINGLE-LIP DEEP-HOLE DRILLING
(Cycle 241)
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 Then the TNC moves the tool at the defined positioning feed
rate to the set-up clearance above the deepened starting point
and activates the drilling speed (
M3) and the coolant. The TNC
executes the approach motion with the direction of rotation
defined in the cycle, with clockwise, counterclockwise or
stationary spindle.
3 The tool drills to the hole depth at the feed rate F, or to the
plunging depth if a smaller infeed value has been entered. The
plunging depth is decreased after each infeed by the decrement.
If you have entered a dwell depth, the TNC reduces the feed
rate by the feed rate factor after the dwell depth has been
reached.
4 If programmed, the tool remains at the hole bottom for chip
breaking.
5 The TNC repeats this process (3 to 4) until the programmed
total hole depth is reached.
6 After the TNC has reached the hole depth, the TNC switches off
the coolant and resets the drilling speed to the value defined for
retraction.
7 The tool is retracted at the retraction feed rate to the set-up
clearance. If programmed, the tool moves to the 2nd set-up
clearance at
FMAX.
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.
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!