HEIDENHAIN TNC 320 (34055x-06) Cycle programming - Manual (Page 81)

SINGLE-LIP D.H.DRLNG (Cycle 241, DIN/ISO: G241) 3.10
3
TNC 320 | User's Manual Cycle Programming | 5/2013
81
3.10 SINGLE-LIP D.H.DRLNG (Cycle 241,
DIN/ISO: G241)
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 entered drilling depth at the programmed
feed rate
F.
4 If programmed, the tool remains at the hole bottom for chip
breaking. Then the TNC switches off the coolant and resets the
drilling speed to the value defined for retraction.
5 After the dwell time at the hole bottom, the tool is retracted to
the set-up clearance at the retraction feed rate. 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!