HEIDENHAIN ND 780 - Handbuch (Seite 176)

52
I Operating Instructions
I - 3 Milling Specific Oper
ations
Preset Soft Key
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 Distance-To-Go 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 (I)
move from the current 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 distance-to-go 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
If you would like to recall the last entered preset for a
particular axis, press the PRESET soft key and then the axis
key.