. Machine design. ight arm with elliptic section beingthe favorite. The rims of such wheels are of twoclasses, the wide, thin rim used for belt transmissionand the narrow solid rim of the generator or blowingengine wheel. Fly-wheels up to eight or ten feet indiameter are usually cast in one piece ; those from tento sixteen feet in diameter may be cast in halves, whilewheels larger than the last mentioned should be castin sections, one arm to each section. This is a matter, not of use, but of convenience intransportation. The joints between hub and arms and between armsand rim need not be speci
. Machine design. ight arm with elliptic section beingthe favorite. The rims of such wheels are of twoclasses, the wide, thin rim used for belt transmissionand the narrow solid rim of the generator or blowingengine wheel. Fly-wheels up to eight or ten feet indiameter are usually cast in one piece ; those from tento sixteen feet in diameter may be cast in halves, whilewheels larger than the last mentioned should be castin sections, one arm to each section. This is a matter, not of use, but of convenience intransportation. The joints between hub and arms and between armsand rim need not be specially considered here, sincewheels rarely fail at these points. The rim and the jointsin the rim cannot be toocarefully designed. Thesmaller wheel cast in onepiece is more or less sub-ject to stresses caused byshrinkage. The sectionalFig. 77. wheel is generally free from such stresses but isweakened by the numerous joints. Rim joints are of two general classes according asbolts or links are used for fastenings, 166. SAFE SPEED FOR WHEELS. 167 Wide, thin rims are usually fastened together byinternal flanges and bolts as shown in Fig. 77, whilethe stocky rims of the fly-wheels proper are joineddirectly by links or T— head prisoners as in Fig. 78. As will be shownlater, the former is aweak and unreliablejoint, especiallywhen located mid-way between thearms. The principalstresses in fly-wheelrims are caused by centrifugal force
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1906
