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.
Source Scan from Ednie, John (editor) (1925) Carpentry and Joinery, Carpentry and Joinery, vol. IV, London: Gresham Publishing, pp. 54, fig. 7
Author Andy Dingley (scanner)
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current16:03, 30 December 2008Thumbnail for version as of 16:03, 30 December 2008925 × 607 (88 KB)Andy Dingley (talk | contribs){{Scans from 'Carpentry and Joinery', 1925 |description= |figure= |volume=IV }} Category:Lathes Category:Woodworking machinery <!--{{ImageUpload|basic}}-->

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