Chemical vapor deposition of thoriated tungsten protective cups Page: 27 of 45
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3) The part was then chucked in a specially fabricated collet and the end faced off
by grinding perpendicularly to the cylindrical surface and parallel to the inside flat.
4) The outside radius was ground with a formed wheel and grinding blend.
5) The open end was ground to the finish length.
The center hole was trepanned by electrical discharge machining. This method of
material removal was selected because the parts are thin wall, brittle, and fragile at this
point and this force-free method avoids induced fracture or chipping. In addition to the
above advantage, no de-burring is necessary.
The part was held in a V-block and the brass electrode was centered using the ID
of the cup for reference. The cup was filled with oil and used as the reservoir for flushing
away the eroded material while the brass tube was fed downward. A cup finish machined to
MESK-00315 is illustrated in Figure 10.
A. Illustrating As-Deposited Inside B. Illustrating Ground Outside
Surface Finish Surface and Center Hole
Figure 10. Cup Finished to MESK-00316
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Blay, J.S. Chemical vapor deposition of thoriated tungsten protective cups, report, January 1, 1968; Pittsburgh, Pennsylvania. (https://digital.library.unt.edu/ark:/67531/metadc1026564/m1/27/: accessed March 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.