. Railway mechanical engineer . Fig. 7—Large High Speed Steel Milling Cutter and it may be of interest here to show details of(jne size of cutter which has already been noted inrelation to the groups in Figs. 1 and 2. This particularform of cutter is used on a heavy vertical spindle millingmachine and its dimensions as well as the proportions of itsarbor are covered by the drawing shown in Fig. 4. The cutteris 6j/8 in- long by 5 in. diameter. It has 13 teeth cut toan advance angle of 26 deg. or one turn in 30 in. The teethare cut with a 70 deg. milling cutter, to a depth of are provid
. Railway mechanical engineer . Fig. 7—Large High Speed Steel Milling Cutter and it may be of interest here to show details of(jne size of cutter which has already been noted inrelation to the groups in Figs. 1 and 2. This particularform of cutter is used on a heavy vertical spindle millingmachine and its dimensions as well as the proportions of itsarbor are covered by the drawing shown in Fig. 4. The cutteris 6j/8 in- long by 5 in. diameter. It has 13 teeth cut toan advance angle of 26 deg. or one turn in 30 in. The teethare cut with a 70 deg. milling cutter, to a depth of are provided with a 7/32-in. fillet at the bottom. Thegap between teeth will amount to about 2 ^^4 cu. in. for eachtooth; thus ample chip space is provided for heavy millingoperations. The bore of the cutter where it tits the arbor is /4 Confers (b/fonts). Coffer PluffS set rn Spiral mfh Coffer Body fo be made o^Ar/e Sfee/. CofferPfoff. fl/omber/^t^utred 174 F^r 8—Construction of Inserted Tooth Milling Cutter 2 in.: there is a bearing surface at each end l;s in- longand a ke}-way at one end for a fs-in. key. Cutters of this design after they have been ground in re-sharpening to a point where the teeth require reforming, arerecut and this process is repeated until the outside diameterhas been reduced to 3;>8 in., which means that only a 5/16-in. wall remains between the bore and the bottom of thetooth fillet. But even with this marked reduction in diam-eter, the teeth are amply coarse and the space between themsufficient to give satisfactory results. Fig. 5 represents the process of recutting a mill of thispattern. To all appearances the work is quite like a freshcutter except for the narrowing down of the land at the topof the tooth (which will of course be ground after the cutteris again hardened an
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
