. Scientific American Volume 24 Number 03 (January 1871) . Boring Segment of Hollow Cylindrical Ring. Messrs. Editors :—In your issue of the 20fc of NovemberL. V. asks this question : Will some practical mechanic tellme how I can bore out true a segment of a hollow cylindri-cal ring, the segment being the sixth part of such a ring, thediameter of which is two feet, and the diameter of the borebeing required to be six inches ? I sent you what I supposed to be a true plan for the pur-pose, but in your issue of December 17th you ask me, Haveyou not mistaken the drift of L. query? In reply Ian
. Scientific American Volume 24 Number 03 (January 1871) . Boring Segment of Hollow Cylindrical Ring. Messrs. Editors :—In your issue of the 20fc of NovemberL. V. asks this question : Will some practical mechanic tellme how I can bore out true a segment of a hollow cylindri-cal ring, the segment being the sixth part of such a ring, thediameter of which is two feet, and the diameter of the borebeing required to be six inches ? I sent you what I supposed to be a true plan for the pur-pose, but in your issue of December 17th you ask me, Haveyou not mistaken the drift of L. query? In reply Ianswer, yes. And now, fully understanding your correspon-dents wishes or statement, I propose to try it again:. Make a wooden frame, into which fasten the segment to bebored, with the bore down. Place this frame in front of anengine lathe opposite the face plate. Turn a piece of roundiron about one third the diameter of the bore of segment,and bend it over a turned circle the same as desired (viz.,two feet); pass it through the segment and fasten it to theframe rigidly. In the exact center of the segment on thisbent bar or mandrel make a sliding head some four incheslong (in halves and rabbeted) so as to move freely throughthe segment. Feather the same, if liable to turn in theleast. In the center of this slide turn a collar, and thereonplace a ring with a cutter in the center. Set the cutter outto take a cut, and hold the loose ring with a set screw. Nowit is very evident that if you push this slide through thesegment you will cut a groove to correspond with the circleof the mandrel. Draw it back and loosen the sit screw andtun the ring for a new cut. Tighten with the set screw,ami snow the; j
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