When a long piece of work is suspended between lathe centers it will sag more or less. Also very heavy work is too heavy for safe support by the lathe centers and additional support must be provided. To prevent sagging and provide increased support for work, a steady rest, as shown in Fig. 181, is used. The principle of this may be provided in simpler form, such as blocking up under the work and making a bearing on wood, or metal kept lubricated.
The steady rest here shown is clamped on the bed of the lathe by the yoke and bolt at the bottom, and the three sliding pieces are adjusted by the long screws to support the work at three different points. When work is to be removed from the lathe, the upper part of the steady rest may be opened on its hinge.
Fig. 181. - Steady Rest.