. The Street railway journal . eration can frequently be done inone revolution if correct size is gotten on roughing cut. Therest is now in correct position for finishing the flange whichis done by means of forming tools. About tworevolutions are required for each side of apply chamfering and beveling tool to outside oftread, finishing it in about two revolutions. The wheels arenow finished and the rests are in the right position for thenext pair. -^-♦^ DEVICE FOR CASTING BRONZE BEARINGS It is known that any molten metal poured into any wetsand mould will oxidize. This is caused
. The Street railway journal . eration can frequently be done inone revolution if correct size is gotten on roughing cut. Therest is now in correct position for finishing the flange whichis done by means of forming tools. About tworevolutions are required for each side of apply chamfering and beveling tool to outside oftread, finishing it in about two revolutions. The wheels arenow finished and the rests are in the right position for thenext pair. -^-♦^ DEVICE FOR CASTING BRONZE BEARINGS It is known that any molten metal poured into any wetsand mould will oxidize. This is caused partly by exposureto the atmosphere and also to the oxidizing effect of the steamgenerated when the hot metal comes in contact with the wetsand. Even when great care is exercised by the use of skimgates and in the pouring, it is virtually impossible entirely toprevent the oxides formed within the metal from passingthrough the gate in the form of scum and becoming imbed-ded in the castings. The entrained or embedded oxide in. Side Elevation Section Through 5—5 Secti FIGS, 1, 2 AND 3.—DETAILS OF DEVICE FOR CASTING BRONZE castings is especially undesirable and injurious to castings in-tended for bearings. The Lumen Bearing Company, of Buffalo, has developeda machine for casting Lumen-Bronze bearings, in which theaim has been to attain two objects: first, to produce a ma-chine whereby full and perfect castings could be made eco-nomically by the use of permanent metal moulds, and second,to make castings which would be entirely free from entrainedscum or metallic oxides. The invention consists of a method of making castings bythe use of moulds in which the mould and gate are movable relatively to each other, and mounted in such a manner thatthe part of the mould remote from the gate is filled in advanceof the part adjacent to the gate. The filling of the mould isan even and continuous operation, in that the metal flows iinto the mould without spattering or having its surface f
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
