The log feed is obtained from the lever l, which operates the ratchet wheel t, which drives bevel gears v and w, which operate the screws that slide the heads h, and h′, along the slideways s and s′.
Three rates of log feed are obtained by regulating the amount of motion that can be given to the lever l, the construction being as follows:
In the lever l is a slot in which a stop r can be secured at different heights, and the piece m has four notches. The limit to which l can be moved to the left is until it comes against the stop x, but the limit to which it can be moved to the right is governed by the height of the stop r in the slot in l. If stop r is set at its highest position in the slot, l can be moved to the right until the stop r meets the right hand step on the circumference of m, and a maximum of log feed is given.
TUBULAR SAW MACHINE.
Fig. 3118.
[Fig. 3118] represents a tubular saw machine. The saw runs in fixed bearings, the work feeding on the table b, running on ways on a. The work is here obviously sawn to a curve corresponding to that of the circumference of the saw.
CROSS CUTTING OR GAINING MACHINE.
In [Figs. 3119] and [3120] is represented a machine constructed for either cross cutting or gaining, the gaining head shown on the machine being replaced by a cross-cut saw when cutting off is to be done.