HEIDENHAIN ND 522 - Manual (Page 39)

ND 522/523 39
I -
3
Milling
Specific
Oper
ations
Presetting
The Preset function allows the operator to indicate the nominal (target)
position for the next move. Once the new nominal position
information is entered the display will switch to Incremental mode,
and show the distance between the current position, and the nominal
position. The operator now only needs to move the table until the
display is zero, and he will be at the required nominal position. The
information for the location of the nominal position can be entered as
an absolute move from the current datum zero, or as an incremental
move from the current nominal position.
Presetting also allows the operator to indicate which side of the tool
will be doing the machining at the nominal position. The R+/- soft key
in the Preset form defines the offset that will be in effect during the
move. R+ indicates that the center line of the current tool is in a more
positive direction than the edge of the tool. R- indicates that the center
line is in a more negative direction than the edge of the current tool.
Using R+/- offsets automatically adjusts the incremental value to
account for the diameter of the tool.
Absolute Distance Preset
Example: Milling a shoulder by traversing to display value zero using
absolute position
The coordinates are entered as absolute dimensions; the datum is the
workpiece zero.
Corner 1: X = 0 mm / Y = 20 mm
Corner 2: X = 30 mm / Y = 20 mm
Corner 3: X = 30 mm / Y = 50 mm
Corner 4: X = 60 mm / Y = 50 mm
To recall the last entered preset for a particular axis, press
the axis key.