Canadian foundryman (1921) . _LJ ?_ FIG. 14—SETTING THE ARMS TOGETHER. laid on it and, with the try square, linesdrawn across the face corresponding to thespacing done in the lathe. Placing the trysquare against the rim of the gear is not al-ways a reliable method. Fig. 14. shows a substantial manner ofsetting the arms together. This work canbe done very handily on the ordinary benchsaw. After the arms have been put to-gether, they should be let into the rim as. FIG. 13- BUILDING UP THE RIM OF GEAR WHEEL. Construction of Gear Patterns The general method of constructing orbuilding up a gear whe
Canadian foundryman (1921) . _LJ ?_ FIG. 14—SETTING THE ARMS TOGETHER. laid on it and, with the try square, linesdrawn across the face corresponding to thespacing done in the lathe. Placing the trysquare against the rim of the gear is not al-ways a reliable method. Fig. 14. shows a substantial manner ofsetting the arms together. This work canbe done very handily on the ordinary benchsaw. After the arms have been put to-gether, they should be let into the rim as. FIG. 13- BUILDING UP THE RIM OF GEAR WHEEL. Construction of Gear Patterns The general method of constructing orbuilding up a gear wheel pattern is shown inFig 13. The rim should be built up and shown in Fig. 13 and secured with glue anddowel pins. After the teeth have all beenjigged out they should be placed on the rim,the root of each tooth being set with its edge in contact with one of the spacing linesdrawn on the face of the rim. This is avery much more accurate method than at-tempting to space the teeth to a center tooth should be glued in place andrubbed down so that it fits the line accuratelyand then after the glue has set slightly,nailed in position. As the work proceeds theteeth should be tested with square andcalipers and the work finished by rubbingin a leather fillet. BEGINNING WITH MAY ISSUE. With the May issue of Canadian Foundry-man we will begin a series of articles byW. P. Essex, of London, Ont., which will beof exceptional interest to pattern-makers. To ap
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfoundri, bookyear1921
