HEIDENHAIN ND 287 User Manual - Manual (Page 17)

ND 287
17
I – 2 F
undamentals of positioning
Actual position, nominal position and
distance-to-go
The position of the length gauge at any given moment is called the
actual position
, while the position that the length gauge is to move
to is called the nominal position. The distance from the nominal
position to the actual position is called the distance-to-go (see Fig.
I.4).
Fig. I.4 Nominal position S, actual position I and
distance-to-go R
R
I
S