HEIDENHAIN iTNC 530 227
8.4 CYLINDER SURFACE Ridge Milling (Cycle 29, DIN/ISO: G129, Software
Option 1)
8.4 CYLINDER SURFACE Ridge
Milling (Cycle 29, DIN/ISO:
G129, Software Option 1)
Cycle run
This cycle enables you to program a ridge in two dimensions and then
transfer it onto a cylindrical surface. With this cycle the TNC adjusts
the tool so that, with radius compensation active, the walls of the slot
are always parallel. Program the midpoint path of the ridge together
with the tool radius compensation. With the radius compensation you
specify whether the TNC cuts the ridge with climb milling or up-cut
milling.
At the ends of the ridge the TNC always adds a semicircle whose
radius is half the ridge width.
1 The TNC positions the tool over the starting point of machining.
The TNC calculates the starting point from the ridge width and the
tool diameter. It is located next to the first point defined in the
contour subprogram, offset by half the ridge width and the tool
diameter. The radius compensation determines whether
machining begins from the left (1, RL = climb milling) or the right
of the ridge (2, RR = up-cut milling).
2 After the TNC has positioned to the first plunging depth, the tool
moves on a circular arc at the milling feed rate Q12 tangentially to
the ridge wall. If so programmed, it will leave metal for the finishing
allowance.
3 At the first plunging depth, the tool mills along the programmed
ridge wall at the milling feed rate Q12 until the stud is completed.
4 The tool then departs the ridge wall on a tangential path and
returns to the starting point of machining.
5 Steps 2 to 4 are repeated until the programmed milling depth Q1
is reached.
6 Finally, the tool retracts in the tool axis to the clearance height or
to the position last programmed before the cycle (depending on
machine parameter 7420).
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