. Illustrated catalogue and general description of improved machine tools for working metal . rged or milled. The advan-tage of being able to grind drills which will make holes of uniform diameter isvery great when the holes are to be reamed, as it permits the size of the drill tobe so proportioned to that of the reamer as to leave the least practical amount ofwork for the latter. Very little skill on the part of the operator is required, thesize of the drill itself in all cases automatically determining its position for correctgrinding. The pump and water-supply nozzles enable the work to be
. Illustrated catalogue and general description of improved machine tools for working metal . rged or milled. The advan-tage of being able to grind drills which will make holes of uniform diameter isvery great when the holes are to be reamed, as it permits the size of the drill tobe so proportioned to that of the reamer as to leave the least practical amount ofwork for the latter. Very little skill on the part of the operator is required, thesize of the drill itself in all cases automatically determining its position for correctgrinding. The pump and water-supply nozzles enable the work to be donequickly and without risk of drawing the temper of the drills. The benefit of having the lips and points of drills accurately ground isfound not only in superiority of the work, but also in diminished wear on themachines, and the less power required to drive and feed them. Having all drillsground by one man on this machine, increases the output of the drilling machines,the uniformity of the product, and saves drills. \Vm. Sellers & Co., Incorporated, Philadelphia, Pa. 119 Plate FRONT VIEW OF PATENT DRILE-GRINDING MACHINE. WITH Pointing Attachment. Produces cutting edges of the correct shape on any kind of double-lip drillfrom tV to 3, without any alteration or adjustment of the holding devices tosuit different sizes and kinds, and reduces the thickness of the web at the pointsymmetrically about the axis. ;2o Wm. Sellers & Co., Incorporated, Philadelphia, Pa. Plate No. 99.
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Keywords: ., bookcentury1800, bookdecade1890, bookidillu, booksubjectmachinery
