The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . cks are introduced in most cases as in fig. 7, andthese not only resist the stress of the cutting, but gauge the diameterexactly. ^ • Sharing Action.—In many tools a shearing operation takes pla^ which the stress of cutting is lessened. Though not vet^apparent, it is present in the round-nosed roughing: tools, in theknife tools, in mOst milling cutters, as well as m all the shearingtools proper—the scissors, shears, &c. ?? Planes.—We pass by the familiar great chisei group, used bv wocid-worke
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . cks are introduced in most cases as in fig. 7, andthese not only resist the stress of the cutting, but gauge the diameterexactly. ^ • Sharing Action.—In many tools a shearing operation takes pla^ which the stress of cutting is lessened. Though not vet^apparent, it is present in the round-nosed roughing: tools, in theknife tools, in mOst milling cutters, as well as m all the shearingtools proper—the scissors, shears, &c. ?? Planes.—We pass by the familiar great chisei group, used bv wocid-workers, v/ith a brief notice. Generally the too! angles of these liebetw^n 15 and 25°. They include the chisels proper, and thegouges in numerous shapes and proportions, used by carpenters, HAND TOOLS] TOOL . stone-masons and allied tradesmen. .These 8P7 ate mostly thrust by hand to ^^^^^.j ^ t^e stout mortise control. Other fseU axe ^^=0 Pf j ^^j stone-masons toulschisels, some of the E°efbody chills coerced by the mechanicalIon\«PofXrJL5» T4 sformetal stocl. The. also iron in breaking the shaving and conferring rigidity upon the cuttingiron. This rigidity is of similar value in cuttmg wood as in cuttingmetal though in a less marked degree. , . , ^ . .\ Drillmg and Boring roo/i—Metal and timber are bored withequal facility; the tools (figs. 9 and 10) embody similar differencesto the cutting tools already instanced for wood and metal. All thewood-lvorking bits are true cutting tools, and their angles, if analysed,will be found not to differ much from those of the razor and commonchisel. The drills for metal furnish examples both of scrapers andcuttirig tools. The common drill is only a scraper, but all the twistdrills cut with good incisive action. An advantage possessed by alldrills is that the cutting forces are balanced on each side of thecentre of rotation. The same action is embodied in the best wood-boring bits and augers, as the Jennings, the Cilpin an
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectencyclo, bookyear1910
