The mechanic's tool book. With practical rules and suggestions for use of machinists, iron-workers and others (1868)
Harrison, William B · New York, D. Van Nostrand · leaf 212
pon 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… … 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…
Machine-shop practice · Tools
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