. School shop installation and maintenance . hinglue or shellac. After gluing the paper, plans for an oil groove can easily bemade by rubbing clay on a small cord or wrapping string andputting the latter around the shaft. One turn around the shaftdirectly under the oil hole in the box should first be made and aknot tied. Then each end of the string should be wound spirallyaround the shaft towards an end and in such a direction that theturning of the shaft will cause the oil to work out along the groove BABBITTING 81 that is to be left by the cord. That is, wind each end in the direc-tion the s
. School shop installation and maintenance . hinglue or shellac. After gluing the paper, plans for an oil groove can easily bemade by rubbing clay on a small cord or wrapping string andputting the latter around the shaft. One turn around the shaftdirectly under the oil hole in the box should first be made and aknot tied. Then each end of the string should be wound spirallyaround the shaft towards an end and in such a direction that theturning of the shaft will cause the oil to work out along the groove BABBITTING 81 that is to be left by the cord. That is, wind each end in the direc-tion the shaft turns, Fig. 67. Make only one to three turns aboutthe shaft with each end and go no nearer the end of the bearingthan about % and fasten the string there by wrapping it squarearound the shaft once and tying it. This method can perhaps bemore easily used on a spHt box than a sohd one but, on the latter,it can be used by gluing the paper around the shaft just at one sideof the box, tying the string around it there and finally shpping the. Fig. 67 paper and string gently into place in the box, taking care that thecenter knot on the string lines up with the oil hole in the box. 79. Damming up the Box.—The next step is that of dammingup the box so that the hot metal will not run out. A good materialfor this purpose is clay. It should be no wetter than necessaryto mold properly, else steam will be formed and a blow blow means the scattering of the hot metal by the formationof steam. If a number of bearings are to be poured and thematerial is to be used for damming again and again, putty mixedwith asbestos ^\\\ not dry out like clay, and requires mixing butonce each time bearings are to be poured. Putty, if not mixed with 82 SCHOOL SHOP MAINTENANCE the asbestos, will get very soft when warmed and will not holdthe molten metal in the box. 80. Melting the Metal.—While this process of damming isgoing on, the babbitt metal can be melting. The melting placeshould be as cl
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectmanualt, bookyear1922
