. The street railway review . SPECIAL GRINDING TOOL. the switch point (lins as they become wcirn. the grinding tool illus-trated has been and built for this work. This tool consists of an ordinary lathe hcd with a face plate 0:1a shaft driven by the usual type of belt. .\ chain gear operatinga worm shaft serves to move a carriage along the bed of themachine. On a fixed pedestal at the center of the bed frame issupported a universal joint with one axis perpendicular and the. AIR-DRIVEN , KAIL SAW. feeding adjustment is fitted with a ball and socket joint, the socketof which
. The street railway review . SPECIAL GRINDING TOOL. the switch point (lins as they become wcirn. the grinding tool illus-trated has been and built for this work. This tool consists of an ordinary lathe hcd with a face plate 0:1a shaft driven by the usual type of belt. .\ chain gear operatinga worm shaft serves to move a carriage along the bed of themachine. On a fixed pedestal at the center of the bed frame issupported a universal joint with one axis perpendicular and the. AIR-DRIVEN , KAIL SAW. feeding adjustment is fitted with a ball and socket joint, the socketof which is bolted to the face plate of the tool. With both belts driving the machine the emery wheel revolveson its own axis, which in turn is moved by the ball an<l socketjoint connection at the face plate so that any point in it describesa circle and the revolving shaft itself becomes the generatrix ofa cone. The switch point whose pin is to be ground is centered by meansof a yoke and adjusting wheel so that it is on an exact line withthe center of the face plate of the machine. By means of and two clamps the tongue is held rigidly in the verticalposition shown. When adjusted to take a cut over the surface ofthe pin, the gears are thrown in and the emery wheel, due to itspeculiar motion moves around the pin, revolving on its own axisand cutting as it moves, and the longitudinal feed of the carriagemoves the work to and from the wheel as in the ordinary processof
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
