. Appleton's dictionary of machines, mechanics, engine-work, and engineering. at the other end in a grooved shoulder; this axis is movable in a socket which forms a supportand is fixed to the saddle C, and by means of an ingenious contrivance the forked lever t is made toconnect or disconnect at pleasure the spindle that : arries the spur-wheel s, with the square end of thescrew / of the carriage D D. It is obvious, if we suppose the saddle to be fixed on the lathe-bed—and to effect this it is merelynecessary to screw up the bolt c—that the guide-screw G giving motion to the tangent-wheel p de
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. at the other end in a grooved shoulder; this axis is movable in a socket which forms a supportand is fixed to the saddle C, and by means of an ingenious contrivance the forked lever t is made toconnect or disconnect at pleasure the spindle that : arries the spur-wheel s, with the square end of thescrew / of the carriage D D. It is obvious, if we suppose the saddle to be fixed on the lathe-bed—and to effect this it is merelynecessary to screw up the bolt c—that the guide-screw G giving motion to the tangent-wheel p deter-mines the motion of the toothed-wheels, and consequently that of the screw/, which after this mannergives motion to the carriage and the tool-carrier, to which we have given, by anticipation, the positionshown in the sectional view, Fig. 3461. It is evident that when tins transverse motion is not required,it is only necessary to throw the wheels out of geer by means of the forked lever t, and then thesewheels will revolve on their axes without producing any The collars or bearings in which the axes of the bevel-wheels n and q revolve freely, are nothingmore than long hollow cylinders bored out true, and fixed on the saddle or bed-plate c, and to avoidthe injury which might result from these wheels becoming clogged by chips of metal, they are usuallyprotected by a metallic cover either of tin or sheet-brass. In the construction of steaji-engines and engineering work generally, there are a great number ofparts, such as steps, bushes, &c, which require their outer diameter to be turned truly concentric withthe hole bored through them. The most general method of accomplishing this, is by driving the workupon a mandrel sufficiently tight to withstand the action of the turning-tool. The common mandrel,which is perhaps the most universal adjunct of the lathe, is a cylindrical bar of steel, turned with anexceedingly slight taper to fit the central hole of the work The
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
