. Illustrated catalogue and general description of improved machine tools for working metal . ??????????I FOUR-SPINDLE VERTICAL DRILLING MACHINE. For plates 8 feet wide. Spindles 211 diameter; 9 stroke, adjustable alongcross-head, together or independently; minimum distance from centre to centre, carrying drilling-heads counterbalance and quickly adjustable by power-feed through positive gearing. Spindles adjustable independently byour patent holdfast, so that any drill may be withdrawn or replaced without stop-ping the others. Plain work-table with slot and bolt-holes. F
. Illustrated catalogue and general description of improved machine tools for working metal . ??????????I FOUR-SPINDLE VERTICAL DRILLING MACHINE. For plates 8 feet wide. Spindles 211 diameter; 9 stroke, adjustable alongcross-head, together or independently; minimum distance from centre to centre, carrying drilling-heads counterbalance and quickly adjustable by power-feed through positive gearing. Spindles adjustable independently byour patent holdfast, so that any drill may be withdrawn or replaced without stop-ping the others. Plain work-table with slot and bolt-holes. Fast and loose pulleys on counter-shaft, 24 diameter, 6 face; 330 rotations per minute. \Vm. Sellers & Co., Incorporated, Philadelphia, Pa. 29 Plate No. EIGHT-SPINDLE DRILLING MACHINE—for Spur Wheels. For drilling connecting bolt holes in parted spur wheels for electric streetcars. The half wheel is set in a jig, centered by pin shown in work table and byturning half way round, a second half is brought under the drills, while the finishedpiece is replaced with another blank. This is an example of a special tool oflimited application, but great efficiency. Useful only for duplicating work inlarge quantities. Speeds and feeds arranged for steel and cast iron. 30 Wm. Sellers & Co., Incorporated, Philadelphia, Pa. Plate No. 21.
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Keywords: ., bookcentury1800, bookdecade1890, bookidillu, booksubjectmachinery
