. Railway mechanical engineer . rator ofthe machine. One officer, on being informed of the smalloperation eliminated, thought it too small to consider, Imt itwas too late to stop this department; they were aroused, andas a final result this machine today is finishing the same piecein three operations instead of six and the output has beendoubled. METHOD OF MAKING TUBE EXPANDERS BY F. W. SEELERT Ordinarily tube expanders are made by turning up a solidblank to the desired shape and then slitting it into sectionson the milling machine. At the Soo Lines Shoreham shopsin ilinneapolis, Minn., these
. Railway mechanical engineer . rator ofthe machine. One officer, on being informed of the smalloperation eliminated, thought it too small to consider, Imt itwas too late to stop this department; they were aroused, andas a final result this machine today is finishing the same piecein three operations instead of six and the output has beendoubled. METHOD OF MAKING TUBE EXPANDERS BY F. W. SEELERT Ordinarily tube expanders are made by turning up a solidblank to the desired shape and then slitting it into sectionson the milling machine. At the Soo Lines Shoreham shopsin ilinneapolis, Minn., these expanders are made from bev-eled bar stock. Suitable size stock is selected and blockssawed off as shown at 5 and T. These are the blanks withwhich the operation is started, and they are clamped in themandrels shown at C and D and held in place by set screwsin an iron ring. After the set screws have been tighteneddown and the blanks made secure the mandrel is placedbetween lathe centers and the sections faced off to the correct. Mandrels Used in Making Tube Expanders length. For the smaller sizes it is very handy to use a doubletool holder for facing both ends at tlie same time, especiallywhen the expanders are made in large quantities. This in-sures absolute uniformity in length. After being faced on the ends, the sections are placed inthe mandrels ,-1 and B. The clamps and washers shown atthe top and bottom of these mandrels are tightened down tohold the blanks in place. A series of sharp grooves will benoted on the inside face of the washers. These are for thepurpose of holding the ends of the blanks in place. Thismandrel is put in a lathe and the blanks are turned to the exact contour of the mandrels. These mandrels are turnedfrom a solid piece of carbon tool steel, the recesses being-lotted out of the solid piece to receive the blanks. Themandrel for making superheater expanders has six slots,while the standard tube mandrel has four; each mandrel will,tlierefore, accommoda
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
