The mechanic's tool bookWith practical rules and suggestions for use of machinists, iron-workers and others . om those pre-viously noticed. An implement called the boring-bar is the tool used for this purpose. To make the boring-bar, select a steel or ironrod of suitable length and diameter. For thegeneral jobbing-shop about two feet in length andan inch and three-quarters or two inches in diame-ter will be found suitable. For longer Avork ofcourse a longer rod must be used, and for asmaller hole than two or two and a half inches asmaller rod is necessary; but for holes of less thantwo inches
The mechanic's tool bookWith practical rules and suggestions for use of machinists, iron-workers and others . om those pre-viously noticed. An implement called the boring-bar is the tool used for this purpose. To make the boring-bar, select a steel or ironrod of suitable length and diameter. For thegeneral jobbing-shop about two feet in length andan inch and three-quarters or two inches in diame-ter will be found suitable. For longer Avork ofcourse a longer rod must be used, and for asmaller hole than two or two and a half inches asmaller rod is necessary; but for holes of less thantwo inches diameter, unless it be necessary to borethem eccentric to their circumferences, the boringtools already described may be more advantage-ously employed. Having selected the bar, proceed 122 mechanics tool book. to square up its ends and center them to corres-pond to the form of the center of the lathe, and besure to make the centers very deep, so that thespringing of the bar or a sudden interruption of itscourse will not cause it to fly out from between itsbearings as it turns upon the lathe centers. When. Fig. 28. the bar is turned true and nice, make a suitable mor-tise, of the form of a parallelogram in the centralportion of the bar, in which to place a movablecutter, and form a gib or key to drive in behindthe cutter so as to hold it firmly in place. Thesecutters must be made of the size of the intendedhole, and may be formed with cutting edges ateach end, so that one end will remove the roughchip and the opposite end will produce the finishedsurface. The form of these cutting points will befashioned by the mechanic to best suit his ideasof a cutting tool, and as they operate similar to alathe-turning tool, the hint may perhaps not belost in mentioning it. Preparatory to using the boring bar, the firstthing necessary is to ascertain if the lathe be set THE BORING BAR. 123 so as to turn a true cylinder or a cylinder of thesame size at each end. To do this, take a rodof about
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Keywords: ., bookcentury1800, bookdecade1860, bookpublishernewyo, bookyear1868
