APPLICATION 
Monitoring of Screw 
The 9 exposure stations were placed at the 0.3m 
with a changing every 10? from +140° to -140° 
, for 7 exposure stations placed toward the center of 
object with the cone type changing and at same 
distance and 7 stations placed with the cone type at 
the 0.4m object distance. So all 23 exposure 
stations were placed in the front side (SIDE I ) of 
the screw. At the rear side (SIDE II) of the screw, 
23 exposure points were placed in the same manner. 
All 46 exposure points were planned to be placed. 
To analyze simultaneously both sides of the screw, 
we have arrayed tie points (Photo 1). 
  
Photo 1 Design of Tie Points. 
As the results of monitoring, standard deviation in 
Xis 7.0um - 13.0ym m with the average 8.2um, 
that in Y is 7.0um - 11.0pm with the average 7.7um 
and that in Z is 19.0um - 33.0ym with the average 
22.7um. As the positional error range from 
21.0um to 37.0pm, the accuracy of results is 
satisfied with monitoring the screw. Also in 
monitoring the small precision part, we found that 
the accuracy depend on the arrangement of control 
points, distribution of object points and tie points 
and depth of field. 
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