Transcript Measurements of Octagon Walls with 3D CMM Characteristics of 3D CMM Measurement program Results of insert measurements diameters distances planarity straightness Conclusions & Plans A.Ostaptchouk AMS Meeting at CERN, 16 July.

Measurements of Octagon
Walls with 3D CMM
Characteristics of 3D CMM
Measurement program
Results of insert measurements
diameters
distances
planarity
straightness
Conclusions & Plans
A.Ostaptchouk
AMS Meeting at CERN, 16 July 2002
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Characteristics of 3D CMM
3D Coordinate Measuring Machine
Type
Wenzel RS-1618
Range
2500  1600  1800 mm3
Precision 20 + (L/50 mm) m  70 m
Sensitive elements mechanical feeler
or video camera
A.Ostaptchouk
AMS Meeting at CERN, 16 July 2002
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Mounting Inserts of Octagon Wall
Seven inserts on the top flange
Specification on insert
diameter: 15.0±00.020 mm
Five inserts on the bottom flange
A.Ostaptchouk
AMS Meeting at CERN, 16 July 2002
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Position of Wall on CMM Table
Kinematic 3-point support
A.Ostaptchouk
AMS Meeting at CERN, 16 July 2002
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Position of Wall on CMM Table
A.Ostaptchouk
AMS Meeting at CERN, 16 July 2002
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Insert Measurements
Measurement of circumference
A.Ostaptchouk
Measurement of plane surface
AMS Meeting at CERN, 16 July 2002
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Results (1)
Insert Diameters
A.Ostaptchouk
AMS Meeting at CERN, 16 July 2002
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Results (2)
Insert Distances
All distances are within
±50 m from specs
RMS value: 28 m
A.Ostaptchouk
AMS Meeting at CERN, 16 July 2002
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Results (3)
Inserts Planarity
All residuals are within
±30 m interval
RMS value: 9 m
A.Ostaptchouk
AMS Meeting at CERN, 16 July 2002
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Results (4)
Inserts Straightness
All residuals are within
±50 m interval
RMS value: 19 m
A.Ostaptchouk
AMS Meeting at CERN, 16 July 2002
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Conclusions & Plans
 Octagon wall measurements with Aachen 3D
CMM show that their mounting inserts have the
following characteristics
-20 m  Diameter – 15mm
 0 m
-50 m  Distance - nominal  50 m
-30 m  Residual planarity  30 m
-50 m  Residual straightness  50 m
which is well within specs
 This allows to start assembly of the TRD octagon
 Global survey of the assembled octagon
(including measurements of the positions of
module slots) will be performed immediately
after assembly completion
A.Ostaptchouk
AMS Meeting at CERN, 16 July 2002
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