. Machine design. e metalbeing of nearly uniform thicknessand the flange which is in tensionhaving an area three or four timesthat of the compression a steel casting these may bemore nearly equal. The hollowsection may be of the shape shown in Fig. 4, a hollowrectangle with the tension side re-enforced and slightlythicker than the other threesides. The re-enforcing flangesat A and B may often be utilizedfor the attaching of other mem-bers to the frame as in shapersor drill presses. The box sectionhas one great advantage overthe I section in that itsmoment of resistance to sidebendin
. Machine design. e metalbeing of nearly uniform thicknessand the flange which is in tensionhaving an area three or four timesthat of the compression a steel casting these may bemore nearly equal. The hollowsection may be of the shape shown in Fig. 4, a hollowrectangle with the tension side re-enforced and slightlythicker than the other threesides. The re-enforcing flangesat A and B may often be utilizedfor the attaching of other mem-bers to the frame as in shapersor drill presses. The box sectionhas one great advantage overthe I section in that itsmoment of resistance to sidebending or to twisting is usually much greater. Thedouble I or the U section is common where it isnecessary to have two parallelways for sliding pieces as in lathesand planers. As is shown in the two Is are usually connectedat intervals by cross girts. Besides making the cross-sectionof the most economical form, it isoften desirable to have such alongitudinal profile as shall give auniform fiber stress from end to. Fig. 4.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1906
