. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . 393 GEAR-CUTTING MACHINES. the proper depth of cut is obtained, when the cutter passes through the blank and back by aquick return movement; the wheel is then moved the proper distance for the next tooth, andso on until finished. The cutter-head is adjustable at any angle for cutting bevel-wheels, thedegrees being marked on a graduated arc, no other change being required. There is also pro-vision for moving the cutt
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . 393 GEAR-CUTTING MACHINES. the proper depth of cut is obtained, when the cutter passes through the blank and back by aquick return movement; the wheel is then moved the proper distance for the next tooth, andso on until finished. The cutter-head is adjustable at any angle for cutting bevel-wheels, thedegrees being marked on a graduated arc, no other change being required. There is also pro-vision for moving the cutter out of center eacli way, for cutting ljevt4-\vheels. Rilgmms Bcvd-Gear Cutter is shown in Figs. 2 and 3. The princii)le of the machine isexplained as follows: It is possible to make with any system of interchangeable gears a rack. Fig. 2, 3. —Bilgrams bevel-gear cutter. which will corrocliy gear witli any wheel of the sot. Any wliool that gears correctly with thisrack must therefore also gear correctly with any other wheel of the set: and from this itfollows that if any number of wheels are made to gear correctly with this rack, they mustalso gear correctly with one another. If the wheels were made of some soft material, saywax. the teeth could be formed by simply rolling the blank into the rack, care being takenthat the pitch-line of the blank will roll on that of the rack without slip. The desirablecleaiance can be ol)tained liy giving this rack just the converse of clearance. Gears are. how-ever, made of material that can not be removed by pressure, and the process must thereforebe modifieil. The teeth of the rack might be made of hardened steel, with sharp eilges at theends; and by giving tliem a lateral motion the material could l)e cut away insteatl of to one side. The (liagraiu
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
