Cutting an External National Fine Thread. (12 mm)

Describes the various shapes of tlireatis ami their gives tiie characteristics oi the Na- uses; tional Fine Tliread; show* the procedure useil to cut such a thread on a lathe. Detailed instruc- tions are given for checking the shape of the threading tool with a gage, the proper setting ot the too! for cutting a thread and how to set the lathe for cutting the required pitch. Use of the threading dial is shown in detail.