HEIDENHAIN TNC 426B (280 472) Touch Probe Cycles - Manual (Page 67)

HEIDENHAIN TNC 426, TNC 430 55
3.2 A
u
to
matic D
at
u
m Set
ting
DATUM FROM INSIDE OF CORNER (touch probe
cycle 415, ISO: G415)
Touch probe cycle 415 finds the intersection of two lines and defines
it as the datum. If desired, the TNC can also enter the intersection into
a datum table.
1 Following the positioning logic (see “Running touch probe cycles”
on page 7), the TNC positions the touch probe at rapid traverse
(value from MP6150 or MP6361) to the first touch point
1 (see
figure at upper right) that you have defined in the cycle. The TNC
offsets the touch probe by the safety clearance in the direction
opposite the respective traverse direction.
2 Then the touch probe moves to the entered measuring height and
probes the first touch point at the probing feed rate (MP6120 or
MP6360). The probing direction is derived from the number by
which you identify the corner.
3 Then the touch probe moves to the next starting position 2 and
probes the second position.
4 The TNC positions the probe to starting point 3 and then to starting
point 4 to probe the third and fourth touch points.
5 Finally the TNC returns the touch probe to the clearance height and
sets the datum at the intersection of the measured lines, or enters
its coordinates in the active datum table.
4
3
1 2
The TNC always measures the first line in the direction of
the minor axis of the working plane.
Before programming, note the following:
Before a cycle definition you must have programmed a
tool call to define the touch probe axis.