Fig. 24. An Example of “Air Spinning” and the Chucks used
Various Types of Metal-spinning Chucks and their Construction
A miscellaneous collection of spinning chucks is shown in Fig. 25. As will be seen, the larger ones are machined out in the back to lighten them, and also to give them an even balance. The larger of those illustrated measure about 9½ inches in diameter, and they are made of cast iron, while the smaller chucks shown in this view are of machine steel. The chuck marked A is a key chuck. Another collection of spinning chucks of various shapes is shown in Fig. 26. Those in the upper row are all key or split chucks, and the keys are shown withdrawn from the sockets. All these chucks, up to 6 inches in diameter, are made of machine steel; those seen in the lower row are shapes which are comparatively easy to spin.
Fig. 25. Miscellaneous Collection of Spinning Chucks
Fig. 26. Another Group of Spinning Chucks. Those in the Upper Row are of the Split or Key Type
A collection of hard maple chucks is shown in Fig. 27, some of which represent shapes that are difficult to spin. The chuck A is 15 inches long, and the maximum diameter of B is 12½ inches. These figures will serve to give an idea of the proportions of the other chucks. All of the chucks shown have threads cut in them and they are screwed directly to the spindle of the lathe, the faceplate being dispensed with. Some of the larger wooden chucks used measure approximately 5 feet in diameter. A chuck of this size is built up of sections which are glued together.
