File:Back-knife lathe (Carpentry and Joinery, 1925).jpg

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Fig. 7

Back-knife lathe. This is a form of automatic lathe, used for mass-production turning of complex shapes, such as staircase spindles, lamp standards etc.

Rough turning of the square blank is done with front-mounted tools on the saddle (C), in the usual way. Once roughed, the pre-arranged and pre-shaped back knives (K) are lowered vertically on the carriage (H) under the action of its weight. This forms a repeatable profile, often a complex curve. As the knife edge is skewed, cutting only occurs at one point at a time, reducing the forces on the lathe.

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Scan from Ednie, John (editor) (1925). Carpentry and Joinery. Carpentry and Joinery (Vol. IV ed.). London: Gresham Publishing. pp. p. 54,fig. 7.

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Andy Dingley (scanner)

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File:Back-knife lathe (Carpentry and Joinery, 1925).jpg

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