The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . oring one or more holes simultaneously. Withfew exceptions the tool rotates and the work is stationary. Thenotable exceptions are the vertical boring lathes already the demands made upon drilling machines are nearly asvaried as those on lathes. There is little in common between themachines which are serviceable for the odd jobs done in the generalshop and those which arc required for the repetitive work of theshops which handle specialities. Provision often has to be madefor dr
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . oring one or more holes simultaneously. Withfew exceptions the tool rotates and the work is stationary. Thenotable exceptions are the vertical boring lathes already the demands made upon drilling machines are nearly asvaried as those on lathes. There is little in common between themachines which are serviceable for the odd jobs done in the generalshop and those which arc required for the repetitive work of theshops which handle specialities. Provision often has to be madefor drilling simultaneously several holes at certain ? centres orholes at various angles or to definite depths, while the mags ofthe spindles of the heavier machines renders counter-balancingessential. Bejuk Machines are the simplest and smallest of the group. Theyare operated either by hand or by power. In the power machinesgenerally, except in the smallest, the drill is also fed downwardsby power, by means of toothed gears. The upper part gf, cUe ^riilin^ | . tM\oi\ sit bnfii i-ivii o-jom -jfiT. A, Base-plate. B, Pillar. C, Radial arm. D, Spindle carriage. _ __ E, Drill spindle. ^^ t F, Main driving cones driving vertical shaft Gthrough mitre-gears H. J, Spur-wheels, driving from C to vertical shaft Mitre-wheels, driving from K to horizontal shaft fyf. having its bearings in the radial , Nest of mitre-wheels driving the wheel spindle E from , Feed-gears to drill spindle, actuated by hand- wtieel P or worm-gears Q. F?G.,46.—Pillar Radial Drilling Machine, 5 ft. radius. R, R, Feed cones driving from shaft M to worm-shaft S, for self-acting feed of , Change-speed gears. — V, Hand-wheel for racking carriage D along radial arm , Clutch and lever for reversing direction of ? rotation of Worm-gear for turning pillar Handle for turning worm,A, Screw for adjusting the height of the radial , Gears for actuating ditto from shaft C. <2,
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectencyclo, bookyear1910
