So far the results have led to an increased awareness of 
the burning machines role in product quality. Structural 
Design areas have refined data inputs to the machine 
prior to burn as well as corrected the few problems that 
have surfaced. In process checks are now regularly 
maintained for this area of fabrication. With process 
control and capability levels determined it is now time to 
turn to adjustments within the machines themselves to 
secure the high\est possible quality levels. 
3.5 Burning Machine Alignment 
To ensure the plate and shape cutting process is 
operating properly checks need to be performed on the 
burning matching periodically, ideally as part of a 
regularly scheduled preventive maintenance program. 
The traditional approach utilizes two surveyors with a 
theodolite to check the flatness, straightness, parallelism 
of each crane rail in relation to each other. Also the 
machined surface that the burning torch travelson is 
checked in for squareness , straightness, and verticality 
to the crane rails. This operation is lengthy 
(approximately 15 running time hours for measurement, 
data reduction, and reporting) and is performed only 
when the machine is shut down. Since these machines 
often have work scheduled to run twenty four hours a day 
-STARS CANJC\2_ 423PWA 
        
24 ‚PRJ - [File: 
seven days a week, any work stoppage impedes 
production. Digital Photgrammetric techniques aim at 
capturing the data quickly during production breaks and 
performing the measurements off line. This process 
requires 4 - 6 control points at the extremes of the 
machine. In this case we can easily make use of existing 
theodolite benchmarks. Next targets are placed at the 
same places checked traditionally (crane rails and 
burning torch traveling surface). From here 25 - 35 
images are needed to ensure proper coverage and 
accuracy. Measurement is initiated with the entry of the 
known control point scale dimensions/coordinates and is 
completed when all target points are accounted for and 
the overall accuracies are within acceptable limits. The 
output to The Maintenance Dept. is in the form of a 
computerized table listing the target ID, actual 
measurements, and corresponding deviations. 
This application is surprisingly fast. Target placement, 
imaging, and target removal was accomplished by 2 
photogrammetrists while the burning machine operator 
was on his 30 minute lunch break. The significance is 
that the impact to production (in a worst case scenario 
due to measurement time) from work stoppages is 
reduced from 15 running hours to 7 if the burning 
machine is left stationary until results are determined. . In 
Figure 9 
272 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B5. Vienna 1996 
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