Woodwork for secondary schools; a text-book for high schools and colleges, prevocational and elementary industrial schools (1916)
Griffith, Ira Samuel, 1874-1924 · Peoria, Ill., Manual Arts Press · leaf 94
r square or cir-cular, the circularsuperseding the square. Some machines are fitted with sectional feed rolls. Fig.153, which consist of small vetrical sections placed on aneccentric center so as to admit different thicknesses ofstock under each section. The purpose of such a feedroll is to prevent… … Fig. 153. Sectional Feed Rolls. 90 WOODWORK FOR SECONDARY SCHOOLS. outer ring which encloses four radial sections, eachcarrying a helical spring. These springs permit a verticalvariation of i^^, if required. With such a feed roll asectional chip breaker is used. Smoothness of cut, other things…
Woodwork (Manual training)
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