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Proceedings Paper

Problems And Their Solutions When Thin-Walled Turned Parts Of High Precision With Quasi-Optical Surfaces Are Manufactured On A CNC Automatic Lathe Under Workshop Conditions
Author(s): Valentin E. Jager
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Paper Abstract

The geometrical accuracy and surface roughness of diamond-turned workpieces is influenced by several parameters: the properties of the machine tool, the cutting process and the environmental conditions. A thin-walled electrode made from an aluminium alloy (wall thickness: 1 mm, length: 169 mm, outer diameter: 126 mm) and intended for an electrostatic measuring instrument, serves as an example to show how quasi-optical surfaces with a surface roughness Rα < 10 nm and deviations from roundness of ≤ 5 μm can be achieved when some of these influence quantities are optimized. The cylindrical part of the electrode was turned by means of a rounded mirror-finish diamond tool, the width of the cutting edge being 2 mm, the rake angle -6° and the clearance angle 2°. Compliance with the tolerances of geometrical accuracy was particularly difficult. As age-hardened wrought aluminium alloys cannot be stress-relieved by annealing, or only insufficiently, the geometrical accuracy - in particular the roundness - of thin-walled, rotationally symmetric bodies decisively depends on the state of stress of the workpiece material, on the clamping fixture and on the balanced condition of this clamping fixture.

Paper Details

Date Published: 11 April 1989
PDF: 7 pages
Proc. SPIE 1015, Micromachining Optical Components and Precision Engineering, (11 April 1989); doi: 10.1117/12.949443
Show Author Affiliations
Valentin E. Jager, Physikalisch-Technische Bundesanstalt (Federal Republic of Germany)

Published in SPIE Proceedings Vol. 1015:
Micromachining Optical Components and Precision Engineering
Peter Langenbeck, Editor(s)

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