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<p>[QUOTE=&quot;springfld.arsenal, post: 103296, member: 54&quot;]If the hole is conical it is almost certainly a lathe center.&nbsp; The machinist uses a special very short drill bit to drill the center hole, which leaves a hollow cone with the same angle as the lathe center&#039;s point.&nbsp; The center is exchanged for the drill in the tailstock, the &quot;workpiece&quot; is fastened to the motorized spindle with a chuck or faceplate, and cutting, polishing etc begins.&nbsp; The center is a hardened steel point with an included angle of 60 degrees, to which grease is applied to allow it to serve as a small bearing.[/QUOTE]</p><p><br /></p>

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