. American engineer . Fig. 1—Volute Spring Witii Flat Base and Top Equal to ^,n of theCircumference. calculating the exact length and shape of the bar and in deter-mining tlie effective leverages of the coils—the results wdl notbe satisfactory. The following directions and formulas, if care-fully followed and applied, will eliminate the possibility oferrors to a great extent. The three dimensions which generally limit the design ofthe spring arc the inside diameter, the outside diameter, andthe height. Having these three dimensions given, the mainpoint is to utilize all the available space and
. American engineer . Fig. 1—Volute Spring Witii Flat Base and Top Equal to ^,n of theCircumference. calculating the exact length and shape of the bar and in deter-mining tlie effective leverages of the coils—the results wdl notbe satisfactory. The following directions and formulas, if care-fully followed and applied, will eliminate the possibility oferrors to a great extent. The three dimensions which generally limit the design ofthe spring arc the inside diameter, the outside diameter, andthe height. Having these three dimensions given, the mainpoint is to utilize all the available space and to calculate theexact length and shajie of a bar which, when coiled, will ex-. Fig. 2—Bar for a Volute Spring, Having a Flat Base and Top on the Full Circumference. actly fill this space, and at the same time keep the outsideinside coils or boundary circles of the spring the diagrams and formulas: D = the outside diameter of the spring., d = the inside diameter of the spring. H = height of the spring, after test. Hi = height of the spring, hefore test, b = thickness of the bar. h = width or depth of the bar. .\ = offset of the radius centers of the coils. L = length of bar of tapers. Li = length of inside taper (Vi of a complete circle in length). Ls = length of outside taper (>4 of a complete circle in length). and November, 191^ AMERICAN ENGINKER. 585 = total length of the tapered bar. P = thickiifss of the tips or ends of the tapers. Ti =. width vi the tip or end of the inside taper. T2 ^ width of the tip or end cf the outside taper. S ^ utiiform clearance between coils throughout from tip to tip (varies from 1/32 in. to 1/1
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
