. Canadian foundryman (1921). materially helpful to some otherfellow engaged in a similar line of work,and there is no better medium than thecolumns of the trade journal for doing it. Table of Chords and Laying Out a Hexagon Two Small Contributions Which Will Be OfValue to Pattern Makers By J. E. WILLSON THE two articles which I am heresubmitting have been of inestim-able value to me in my work as apattern maker. Either one might befigured out by a capable mathematician,but it takes time and there is alwaysrisk of mistakes. I trust that you willsee fit to publish them as I would liketo see the
. Canadian foundryman (1921). materially helpful to some otherfellow engaged in a similar line of work,and there is no better medium than thecolumns of the trade journal for doing it. Table of Chords and Laying Out a Hexagon Two Small Contributions Which Will Be OfValue to Pattern Makers By J. E. WILLSON THE two articles which I am heresubmitting have been of inestim-able value to me in my work as apattern maker. Either one might befigured out by a capable mathematician,but it takes time and there is alwaysrisk of mistakes. I trust that you willsee fit to publish them as I would liketo see them passed along for the benefitof others. Laying Out a Hexagon Most pattern makers know what timeit takes to lay out a hexagon, especiallyif it is on the end of a round piece. As The first column gives the number ofsegments that may be desired to obtainthe length of the chord. The radius ofthe circle is multiplied by the decimalgiven in the fourth column. The degrees and minutes are alsogiven but they are seldom needed by the. A <r CIRCLE WOULD HAVE TO BE DESCRIBEDAT C, D, AND NOT AT A, B, AS SHOWN. a rule only the distance across the flatsa b Fig. 2 is given. For instance, theorder might call for a hexagon twoinches in diameter, meaning, of course,to fit a wrench with a two-inch the pattern maker wants to knowis what size or diameter of circle hewill have to describe in order to securethe two-inch diameter across the flatsas shown at a b, or in other words hewants to know the diameter from Cto D. Now to find that distance without lay-ing out the work just multiply the dis-tance across the flats by , whichwill give the distance C—D. TABLE OF CHORDS This will be found to be a very con-venient table for ascertaining the lengthof the chords of segments of circles, or
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfoundri, bookyear1921
