HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 171)

155 HEIDENHAIN TNC 410, TNC 426, TNC 430
UNIVERSAL PECKING (Cycle G205, only with the
TNC 426, TNC 430 with NC software 280 474-xx)
1 The TNC positions the tool in the tool axis at rapid traverse to the
input set-up clearance above the workpiece surface.
2 The tool drills to the first plunging depth at the programmed feed
rate F.
3 If you have programmed chip breaking, the tool then retracts by
the entered retraction value. If you are working without chip
breaking, the tool is moved at rapid traverse to setup clearance
and then at rapid traverse to the entered starting position above
the first plunging depth.
4 The tool then advances with another infeed at the programmed
feed rate. If programmed, the plunging depth is decreased after
each infeed by the decrement.
5 The TNC repeats this process (2 to 4) until the programmed total
hole depth is reached.
6 The tool remains at the hole bottom — if programmed — for the
entered DWELL TIME to cut free, and then retracts to set-up
clearance at the retraction feed rate. If you have entered a 2nd
set-up clearance, the tool subsequently moves to that position in
rapid traverse.
Before programming, note the following:
Program a positioning block for the starting point (hole
center) in the working plane with RADIUS
COMPENSATION G40.
The algebraic sign for the cycle parameter TOTAL HOLE
DEPTH determines the working direction.
8.3 Dr
illing Cy
cles
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