McKinley High School - President Yearbook (Buffalo, NY)

Page 42 text:

36 THE .':lRTISflN CENTER LINES We next learned about center lines and their importance to the joli and l'oundations from which to work or the starting place from which a layout is made. 1 The V block, frame and lever clearly illustrate the importance of the center line. . Up to this point, the patterns made by ns were easy to mold and only elementary principles in pattern making, as applied in the foundry, were taken upg they were for simple green sand molds. The next that was taken up was about patterns with green and dry sand cores, for cxampleg the washer, the link, the lever, faceplate and many others. The lever brings out items pertaining to irregular parting of the mold. The parted pattern. shows the need and use of the dowel. pins and the advantage of a parted pattern, over a solid pattern. We were also shown the balanced core, with core prints and core box. These prin- ciples were brought out in reducer, head T, T pipe, return-bend, and many others. The bracket is a good example of green and dry sand core work and it also illustrates the use of the tail core print. The large sleeve built up in segments, the curved armed hand Wheel, the llat and the armed illywheel brought out many other principles and processes. The coating or inish applied on patterns consists of two or three coats of shellac rubbed down smoothly. The foregoing is a brief outline of what We were taught on pattern making. 'We feel that we have covered and mastered the elementary principles of the art. The work and study were interesting and of practical value in addition to the training of the mind, eye, and hand.

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TUE flIi5.T1iS'AN 35 Andrew Maul SHRINKAGE Wlicii the casting is made of east iron, tbe Mg shrinkage rule is applicable. Slirinkage is caused tlirougli cbcniical action wbilc the inoltcn inctal in the mold is cooling, thereby the casting' is rendered smaller than the patterng an allowance innst therefore be inadc on all patterns to compensate for this contraction-the extent thereof depending on the kind of metal and the size of casting. Sbrinkage may be said to be an allowance on the dimensions of as pattern to inalce up for the contraction of the metal as it changes from a liquid to a solid. WVC were next given stock for the test bar. Aiter planing and Sf1lli11'l1lg the four sides and ends, we were told to put draft or taper on tbein. Draft is a slight taper, about Mg to the foot, on a patterng it facilitates its removal from the sand. FINISH May be described to be an allowance on certain surfaces of a, pattern so that the surfaces may be inachincd to their correct size. It is allowed only when designated on the drawing by the italic letter f.

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THE ARTISAN 37 '3 l r it , 9 W Henry C. Staubitz John Koch Alec Armesden Machine Shop This year we have not attempted to cover more ground, hut rather have tried lo do more thoroughly, accurately and undcrstandingly those flll'1Cl?1l1161'll'?1l operations and problems which will, in the future, insure a more rapid advance- ment and a clearer understanding of machine tool operation. We are lirst given the history of the trade and this is followed by a discus- sion of its opportunities, advantages and disadvantages. Safety precautions are very iniportant to the new student, therefore we are thoroughly instructed and cautioned about the inherent dangers present in all moving machinery hefore heing allowed to operate a machine. VVC are next instructed .in the use of the lathe and learn to do rough-turning, facing, finish-liurning, centering, necking, inside and outside radiusing, knurling, drilling, reaming, grinding of tools, elementary thread cutting, and to use arhors and micrometers. Then we are taught the purpose and operation of the Shaper and learn to rough and finish, p-lane surfaces, and make minor adjustments on the machine. Attention is next transferred to the milling machine where an elementary knowledge of the machine is gained, enabling us to perform successfully surface milling. Bench and drill press work is carried on incidentally with the other machine work. In the senior year a more advanced knowledge and a greater degree of skill is required and the theory underlying the work is practically applied. The more advanced processes, on the lathe are -taught, such as internal and external forms of tlireads,,horing and form turning,-Side planing, slottingand cutting key- ways for- theLihaper,-and the use of thc dividing head and gear cutting on the milling machine. 'l'hc drill-press work, layout work and heneh work advance proportionately. . Part of an afternoon each week is given over to physical,exercise followed hy a shower. 'llhe .remainderxof the afternoon is taken up by a shop lecture at which time' information-suppleinentary to demonstratiopns and shop work is given and difficulties are ironed-out. ' .ln all of the extra. curricula ,activities such- as the orcliestra, hand, hasket- hall,,q1 i'ack, soccer football and 'swimming we have been well represented. At the swinnning meet our shop gave an exceptionally good account of themselves, and we feel that our two years at McKinley School have heen very profitably as well as pleasantly spent. Y . l ,