. Cassier's magazine. rtation of work in the shops. Looking into the details of design ofbig machine tools, we note that the fol-lowing points arise:—First, there is theobvious problem of mass. There is nogreat harm in lumping the metalinto machines if small and of mediumdimensions, because it often means adifference of only a few hundredweightsof metal of comparatively trifling small possible savings should notbe allowed to weigh against the advant-ages which mass and rigidity confer. But in the big machines the questionis one often of several tons weight, andthen designs must be ca
. Cassier's magazine. rtation of work in the shops. Looking into the details of design ofbig machine tools, we note that the fol-lowing points arise:—First, there is theobvious problem of mass. There is nogreat harm in lumping the metalinto machines if small and of mediumdimensions, because it often means adifference of only a few hundredweightsof metal of comparatively trifling small possible savings should notbe allowed to weigh against the advant-ages which mass and rigidity confer. But in the big machines the questionis one often of several tons weight, andthen designs must be carefully workedout with judicious regard to economy,obtained by comparatively thin metal,stiffened liberally, and rendered rigidby ample bracketing, and a tapering ofmetal in some cases on the cantileverprinciple, towards overhanging or un-supported parts. In other words, suitable outlines,rather than mere mass, represent theproblem to be worked out. The gen-eral outlines are often made approxi- BIG MACHINE TOOLS 209. CASSIERS MAGAZINE
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