Single-Lip Deep-Hole - HEIDENHAIN TNC 320 User Manual

3.10 SINGLE-LIP DEEP-HOLE DRILLING
(Cycle 241, DIN/ISO: G241)
Cycle run
1 The TNC positions the tool in the tool axis at rapid traverse FMAX
to the programmed 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!
86 Fixed Cycles: Drilling