NASA NTRS · 19700000122
Low-cost orbiting grinder for cutting ducts
Abstract
Low-cost, portable machine cuts ducts made from heat-treated alloys. An abrasive wheel, powered by a high-speed air motor mounted on an expandible plug against the inner wall of the duct, gives precise cutting.
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Lang, E. J.. 1970-05-01. Low-cost orbiting grinder for cutting ducts. https://ntrs.nasa.gov/citations/19700000122
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