Template is used for evaluation of the dynamic characteristics and accuracy of the plotter. It has a profile composed of surfaces parallel to and at known distances from a reference plane, plane, the diverse surfaces being connected by slopes of known angles and blended by cylindrical developments of known radii

Moulton, K. S.

English

NASA Technical Reports Server

September 1969	 Brief 69-10458 
NASA TECH BRIEF 
S
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Calibration Standard for Dynamic Evaluation of a Prof ile-Plotter 
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Details of fabrication of the standard 
The problem: 
Development of a method of dynamic calibration of 
a profile-plotter, or "Profigraph," used in conjunction 
with a commercial X-Y recorder for determination of 
the quality of highly stressed weldments. Initial trials 
of the Profigraph disclosed that, while successive 
chart traces of the same profile path were almost 
identical when taken in the same direction, they were 
markedly different when the direction of traverse of
the stylus was reversed. The built-in micrometer did 
not serve for evaluation/calibration while the stylus 
was moving. 
The solution: 
A standard has been developed for coping with 
dynamic evaluation (figure and table). A template 
is used for evaluation of the dynamic characteristics 
and accuracy of the plotter; it has a profile composed 
of surfaces parallel to and at known distances from 
(continued overleal) 
This document was prepared under the sponsorship of the National
	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States
	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States
	 will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19690000446 2020-03-16T18:04:43+00:00Z
a reference plane, the diverse surfaces being con- 	 Notes: 
nected by slopes of known angles and blended (or 1. The	 innovation	 may	 interest	 makers of highly 
"faired") by cylindrical developments of known radii, stressed weidments, and designers of instruments. S 
How it's done: 2. No further documentation is available. Inquiries 
The Profigraph is evaluated dynamically by making may be directed to: 
traces of the standard profile and subsequent inter- Technology Utilization Officer 
pretation of the traced values in terms of the tabu- Marshall Space Flight Center 
lated calibration values of the standard. The uncer- Huntsville, Alabama 35812 
tainty value, resulting from	 at least three traces of Reference: B69-10458 
the	 standard,	 includes the systematic and	 random Patent status: 
errors inherent in the complete system (in motion); No patent action is contemplated by NASA. 
when	 applied	 to	 the	 Profigraph's	 output data, it Source: K. S. Moulton of 
supplies the information necessary for attainment of North American Rockwell Corporation 
the requisite level of confidence. Thus the standard under contract to 
has contributed to reliability of the overall program. Marshall Space Flight Center 
Tabulated Calibration Values of the Standard (M FS- 16476) 
Test 
No.1 No.2 
Side-2 Center	 Side-1 Center Side-2 Center Side-1 Center 
.0000	 A	 .0000 A A	 .0000 A	 .0000 +0004	 +0005 +0003 +0003 
+0021	 +0022 B	 B +0021 B	 +0021 +.0023	 +0023 +0022 +0022 5 +0067	 C	 +0065 C C	 +0065 C	 +0064 +0068	 +0066 +0067 .	 +0065 
D	 +0129	 D	 +0129 D	 +0128 D	 +0128 +0130	 +0130 +0129 +0129 
E	 +0217	 E	 +0224 E	 +0216 -	 E	 +0223 +0216	 +0223 +0217 +0224 
+0325	 F	 +0332 F F	 +0325 F	 +0332 +0326	 +0332 +0326 +0331 
+0452	 G	 +0457 G +0453 G G	 +0458 +0454	 +0458 +0454 +0459 
+0604	 H	 +0603 H H	 +0604 H	 +0603 +0605	 +0604 +0604 +0604 
+0775	 +0776 +0777 +0777 
+0776	 +0777 +0775 .+.0778 
+0970	 +0974 +0971 J +0975 
+0974	 +0975 +0973 +0976 
+1180	 K	 +1180 K +1181 K +1181 K +1182	 +1181 +1182 +1183 5
Brief 69-10458	 Category 05 


Calibration standard for dynamic evaluation of a profile-plotter

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