Fig. 1683.—Side Elevation.
In [Figs. 1683], [1684], and [1685] is represented a combined drilling and boring machine.
Fig. 1684.—Front Elevation.
It is provided with an horizontal as well as with a vertical spindle, either of which may be used for boring as well as for drilling. In the case of the vertical spindle the boring bar may extend down and have journal bearing in a block, or bearing secured to the base plate i.
Each spindle has eight changes of speed, four in single, and four in double gear, that is when the back gears at a are in operation.
Motion from the pulley k on the cone spindle is conveyed by belt b to pulley l, whose hub extends through the frame at r and affords journal bearing to that end of spindle s which has a feed motion at h. Motion is conveyed from the cone spindle to vertical spindle m as follows:—
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