. Locomotive engineering : a practical journal of railway motive power and rolling stock . The more ambitious way of the smallshop is to take a piece of gas pipe of goodsize, screw a cap on one end, and makeone for the other having a few small holes from three to six hours. Larger pieces re-quire much longer, all night in many cases,and the depth of the carbonizing can beeasily seen at the end of the piece, thecenter remaining soft. It is this feature ofa soft center that makes this process de-sirable for some tools, and it is used tosome extent by those who use large millingcutlers, taps, die
. Locomotive engineering : a practical journal of railway motive power and rolling stock . The more ambitious way of the smallshop is to take a piece of gas pipe of goodsize, screw a cap on one end, and makeone for the other having a few small holes from three to six hours. Larger pieces re-quire much longer, all night in many cases,and the depth of the carbonizing can beeasily seen at the end of the piece, thecenter remaining soft. It is this feature ofa soft center that makes this process de-sirable for some tools, and it is used tosome extent by those who use large millingcutlers, taps, dies, as well as for drophammer dies. After a piece is carbonizedit is treated just the same as tool steel,showing it to be transformed from lowinto high carbon steel. The writer has also seen cases wheresmall milling cutters were made of lowcarbon steel, the cutters being made com-plete, as in the case of tool steel and thenbeing case-hardened in the usual way to adepth of possibly a sixteenth of an was considered cheaper to throw theseaway after they were ground down so as. CYLINDER FASTENING OF SYMONS TEN-WHEEL PASSENGER ENGINE. in for vents. The articles to be hardenedare placed in the pipe, packed with burnedleather, bone, etc., the cover screwed onand kept at a red heat for several hours,depending on the size of piece and thedepth of hardening desired. Others makea sort of box of sheet iron, but those whomake a business of this work use a castiron box with a cover. Leather is notbeing used as much as formerly, on ac-count of the trouble of burning and crush-ing, although it is said to give good color-ings where this is an object. Raw bone isbeing largely used for this purpose nowon account of convenience and low cost,and that prepared by the Rogers & Hub-bard Company, of Middletown, Conn.,known as Granulated, seems to be afavorite with many, although there maybe other brands in use in other sections ofthe country. Case-hardening may be called carbon-izing or st
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroa, bookyear1892
