The mechanic's tool bookWith practical rules and suggestions for use of machinists, iron-workers and others . are pivoted as first explained; the restmoving in a circular manner to form the sphericalshape. The tool used for wood might be made inthe form of a fork at its cutting end, and thenthese forked ends will cut much nearer to the cen-ters, and remove more of the wood, so that thework approaches nearer to the sphere at thesepoints than if it were not so made. The heads ofthe lathes are generally so formed that they inter^fere with a sufficient movement of the tool to cutvery close to thos
The mechanic's tool bookWith practical rules and suggestions for use of machinists, iron-workers and others . are pivoted as first explained; the restmoving in a circular manner to form the sphericalshape. The tool used for wood might be made inthe form of a fork at its cutting end, and thenthese forked ends will cut much nearer to the cen-ters, and remove more of the wood, so that thework approaches nearer to the sphere at thesepoints than if it were not so made. The heads ofthe lathes are generally so formed that they inter^fere with a sufficient movement of the tool to cutvery close to those parts upon which the workrotates. There is another method of producing a spherewhich is generally used by those who make the ball cherries used to shape the spherical recessin bullet molds. It is based upon the principlethat if a rotating body be passed through a cir- PRODUCTION OF SPHERICAL SURFACES. 207 cular aperture at a right angle to its axis, a spherewill result. In this instance a circular apertureis made near the end of a flat bar of steel, asshown in Fig. 44, and great care is taken to insure. Fig. 44. the accuracy of such aperture. Upon one side ofthe flat bar the metal contiguous to the hole isremoved so that a beveled cutting edge, and thena portion of the metal in the form of a V is alsoremoved, so that the apex of the V enters theaperture; when thus formed, the bar is carefullytempered for use. The piece of steel from whichthe cherry is to be made is rotated in the lathebetween the centers and roughly fashioned withthe turning tool into the semblance of a part which was supported by the dead centeris then cut off or removed, and the work made torotate without that support. The bar of steel inwhich the circular aperture is made is the plaaeunderneath the roughly-fashioned sphere, the V-shaped opening being presented to the part of themetal to which the rough phere is attached, and 208 mechanics tool book. passed over or rather the sphere is passed thr
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Keywords: ., bookcentury1800, bookdecade1860, bookpublishernewyo, bookyear1868
