. Canadian foundryman (1921). g. It is theintention, now, to finish this course, butbefore proceeding with it we must bearin mind that there are numerous read-ers who are only students and who donot know the meaning of many of theexpressions necessarily used in referringto the subject. There are also a sur-prising number of pattern makers whocould be classed as first rate workmenfrom a mechanical standpoint, but whoare not familiar with the requirementsof the gear pattern which they aremaking, and who only follow the draw-ings which must be made by someone,more intelligent than themselves. Aga
. Canadian foundryman (1921). g. It is theintention, now, to finish this course, butbefore proceeding with it we must bearin mind that there are numerous read-ers who are only students and who donot know the meaning of many of theexpressions necessarily used in referringto the subject. There are also a sur-prising number of pattern makers whocould be classed as first rate workmenfrom a mechanical standpoint, but whoare not familiar with the requirementsof the gear pattern which they aremaking, and who only follow the draw-ings which must be made by someone,more intelligent than themselves. Againthere are others who are more remotelyconnected with the work, but who do notknow exactly what js required. For the benefit of all of these weconsider it best that before beginningwith the actual pattern making we givea few lessons on the general principlesof gearing so that the reader will themore readily understand what he isreading, and will be in better shape tograsp what is required of the gear wheel TANGENT which is to be cast from the patternbeing made. Pattern making is a calling whichhas many inducements for the educatedclass of boy, and any boy who is suf-ficiently intelligent to make a good pat-tern maker should be sufficiently in-terested in his work to be able to layit out. We do not propose to enter thefield of the mechanical draughtsman, aswe can not cover so many subjects, butpresuming: that the student is versed drawing he should be much helped byknowing what is required to be should also know the expressionsand names used in gearinsr practice. Be-ginning with our next! issue, we willdescribe pitch, pitch circle, diametrical p^tch, teeth, space etc., after whichthe real pattern making will be describ-ed. In the present article we will showthe rudiments of gearing by the twotangent cylinders. Let the two cylinders, Fig. 1, toucheach other, their axis be parallel and thecylinders be on shafts turning , now, we turn one cylinder, th
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfoundri, bookyear1921
