. A textbook on mechanical and electrical engineering . ? Screu/3 m_ T ±. CBAN/6. Wrnuaht Iron^ ,y /O. diately following the title page. JOHN SMITH. CLASS N9 4-529. § 14 MECHANICAL DRAWING 17 25. Fig. 2 sliows a double square-threaded screw 1^ inches in diameter and with f of an inch pitch. Thereason for using a double thread is that if the single squarethread were used, the depth would be so great as to weakenthe bolt or rod on which it was cut and render it unsafe for thepurpose for which it was intended. To prevent this, eitherthe diameter of the rod must be i
. A textbook on mechanical and electrical engineering . ? Screu/3 m_ T ±. CBAN/6. Wrnuaht Iron^ ,y /O. diately following the title page. JOHN SMITH. CLASS N9 4-529. § 14 MECHANICAL DRAWING 17 25. Fig. 2 sliows a double square-threaded screw 1^ inches in diameter and with f of an inch pitch. Thereason for using a double thread is that if the single squarethread were used, the depth would be so great as to weakenthe bolt or rod on which it was cut and render it unsafe for thepurpose for which it was intended. To prevent this, eitherthe diameter of the rod must be increased or the thread mustbe cut of the same depth and thickness as a thread of halfthe pitch, or, in this case, as if the pitch were f X i == f ofan inch, as in the preceding problem; another thread of thesame size and pitch (J of an inch) must be cut half waybetween these first threads, thus giving a double pitch, or distance that the screw would advance in oneturn, would be f of an inch, the same as if it were a single-threaded screw of f of an inch pitch, while
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmechani, bookyear1902
