Milling Machine Standard Tapers - Practical Machinist
116. On July 11, 1938 The National Machine Tool Builders Association Commettee on Milling Machine Nose Standardization approved as Standard the dimensions and configuration of milling machine spindles and arbors that we know as the No. 30, No. 40 and the No. 50 milling machine tapers. The construction was covered by U.S. Patent No. 1794361.
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