Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . the error is doubled. To remedy this defect, Messrs Pratt & Whitney have devised a new kind ofchasing tool, to be held in a tool-holder as shown in Figs. 2706 and 2707. The teeth in the directionof their length A are made straight instead of in a hollow curve, as when cut by a hob, and the anglesof the teeth are corrected after hardening. This, however, is an expensive tool to make, and is some-what unhandy; so that when it is considered how much more easy and ready of accomplis
Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . the error is doubled. To remedy this defect, Messrs Pratt & Whitney have devised a new kind ofchasing tool, to be held in a tool-holder as shown in Figs. 2706 and 2707. The teeth in the directionof their length A are made straight instead of in a hollow curve, as when cut by a hob, and the anglesof the teeth are corrected after hardening. This, however, is an expensive tool to make, and is some-what unhandy; so that when it is considered how much more easy and ready of accomplishment itis to grind a plain turning tool to the requisite angle for either an external or an internal thread, itbecomes apparent that the United [states standard thread possesses important practical , a thread can be cut much more true upon wrought iron or steel with a tool having asingle cutting tooth than with one possessing several such teeth, because the latter are more apt tofollow the inequalities in the texture of the metal. An important consideration in screw-cutting is the pos
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