School shop installation and maintenance . rather than horizontal, it would be necessary to pourit at the end; only, in this case, the upper end of the box wouldnot be clayed and would thus serve for both a pouring port and avent. Any oil holes would be filled with clay. In pouring both halves at once, shims are placed between thehalves, as explained above, together with a piece of cardboardwhich is notched as shown in E, Fig. 71 and should rest againstthe shaft. The total thickness of the shims and the cardboard BABBITTING 85 should be a trifle more than J-g. The notches should be madetwice t
School shop installation and maintenance . rather than horizontal, it would be necessary to pourit at the end; only, in this case, the upper end of the box wouldnot be clayed and would thus serve for both a pouring port and avent. Any oil holes would be filled with clay. In pouring both halves at once, shims are placed between thehalves, as explained above, together with a piece of cardboardwhich is notched as shown in E, Fig. 71 and should rest againstthe shaft. The total thickness of the shims and the cardboard BABBITTING 85 should be a trifle more than J-g. The notches should be madetwice the size and distance apart shown in the drawing for themetal must run thru them in order to fill the lower box, and if toosmall the box will not fill easily; whereas, if they are too large,trouble will be encountered in breaking them apart. This card-board is to make separation of the halves easy. The halves arebroken apart by striking several snappy blows with the cold chiselat the parting of the halves after the shims have been Fig. 70 82. Scraping the Babbitt.—To get a good bearing betweenthe metal and the shaft, the metal must be scraped. There aremany good bearing scrapers on the market. A very good one canbe made out of a half-round wood file by grinding it smooth andthen forming it to the shape shown in, D, Fig. 71. The edgesshould be ground and whetted sharp as shown in the cross sectionview, C, in ths same figure. The first operation, in fitting the bearing to the shaft, is to freethe corners so they will appear like spaces, .1, Fig. 72. Thisshould be don(5 on the lower half and will prevent a possiblepinching of the shaft at the corners. The shaft should be free 86 SCHOOL SHOP MAINTENANCE for a distance of ^i down from the parting on the lower half andan equal distance up on the upper half. After freeing the corners,a little Prussian blue, or lampblack mixed with oil, is rubbed on StCTlONONA-B cl
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectmanualt, bookyear1922
