The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . according to the cam arrangements devised, which of coqrsfiiihave to be varied for pieces of dilTerent proportions and dimensio-n^ when the machines with their tools arc once set up, they will;run for days or weeks, repeating precisely the same cycle of operartions; they are self-lubricating, and only require to be fed with,fresh lengths of bar and to have their tools resharpened occasionally.,Of these automatics alone there are something like a dozen diatiDCttypes, some with their turrets ve
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . according to the cam arrangements devised, which of coqrsfiiihave to be varied for pieces of dilTerent proportions and dimensio-n^ when the machines with their tools arc once set up, they will;run for days or weeks, repeating precisely the same cycle of operartions; they are self-lubricating, and only require to be fed with,fresh lengths of bar and to have their tools resharpened occasionally.,Of these automatics alone there are something like a dozen diatiDCttypes, some with their turrets vertical, others horizontal, l^tooly so but the use of a single spindle is not always deemed,sum-cIently., ^tne of ,thes^ designs now ha>ve i;wc»,(hf€e,and four separate work spindles grouped in one head. LATHES] Sperialized ioDirs.—Outside ot these main types of lathes thereare a large number which do not admit of group are designed (or special duties, and only a representative listcan be given. Lathes (or turning tapered work form a limited TOOLf 25. This of course Is an eirtremely comprehensive classification, becausechucks of the same name differ vastly when used in small and lar^e^lathes. The chucks, again, used in turret work, though they grip-the work by one end only, differ entirely in design from the acechucks proper. , . •? Chucking between Centres.—The simplest and by far the commonest,method adopted is to drill countersunk centres at the ends of the^work to be turned, in the centre or longitudinal axis {fig. 34, A)iand support these on the point centres of headstock and angle included by the centres is usually 60°, and the pointsmay enter the work to depths ranging from as little as -^ in. in verylight pieces to § in., | in. or i in. in the heaviest. Obviously apiece centred thus cannot be rotated by the mere revolution of thekthe, but it has to be driven by some other agent making con- plG, 3j,—Automatic
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectencyclo, bookyear1910
