Belt driven universal cutting frame with multiplying gear

This form of cutting-frame enables a rotating tool to be set to cut at any angle with the axis of the lathe, including the horizontal and vertical positions. it is used for cutting and ornamenting cylinders or other surfaces in various ways and also for cutting the long spirals or helices frequently used in ornamental turning.

The appliance is held in the slide-rest by a square bar through which passes a longitudinal spindle. To the front end of the spindle is fixed a bent arm, that bears against a graduated collar formed on the end of the bar. A washer and screw at the rear end of the spindle serve to clamp the arm in any angular position and a pointer on the arm passes over the graduations and indicates the angle. At the end of the arm at right angles to the spindle is a boss, and this is fitted with a hardened steel bush with an internal cone. A steel spindle fits in this and projects towards the main axis, its end being fitted with a chuck for holding the cutters, which are secured in a mortise by set screws. The back end of this spindle has a spur pinion fixed to it, which gears with a spur wheel attached to the grooved driving pulleys and mounted on a fixed conical spindle. By mounting the cutters on the end of the spindle in this way, and gearing them up from the driving pulleys they are enabled to run at a high speed and to get cl ose up to the work. This apparatus was made by J. H. Evans (d. 1919).