Aviation engines; design--construction--operation and repair; (1919)
Pagé, Victor Wilfred, 1885-1947 · New York, The Norman W. Henley publishing co. · leaf 393
fl B … Fig. 171.—Tools for Thread Cutting. If it is imperative that the thread should be full sizeclear to the bottom of the hole, the third tap of the set,which is straight-sided, is used. It would be difficult tostart a bottoming tap into a hole because it would belarger in diameter at its point than…
Airplanes
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