Eccentric cutting frame for ornamental lathe, by Holtzapffel and Company, London, England, 1892-1912

This appliance is used in ornamental turning for cutting circles of different diameters and at varying distances from the centre of a piece of work which remains stationary while the cutter revolves. When used with different tool shapes, and in conjunction with an eccentric chuck, a great variety of patterns can be produced. It may be used also for shaping up the flat faces of prisms and afterwards ornamenting them.

The tool consists of a square bar that fits the tool-holder of the slide-rest, and is bored longitudinally and fitted at the ends with hardened steel coned collars. Through this is passed a steel spindle, to the front end of which is attached a right-angled slide. A steel pulley with a cone attached is fitted to the rear end and is secured by a screw that serves to adjust the coned bearings. The right-angled slide carries a small tool-holder which is moved along it by a quadruple threaded screw with a divided head, by means of which the tool radius is set. This apparatus was made by J. H. Evans.