“Very specific requirements exist when creating a proper and true solid model of an involute form for gear generation,” says Brian MacNeil, milling products and application specialist for Sandvik Canada Inc. But for true involute forms, such as those required for spur and helical gears, special software is needed. With simple gears and splines, profiling the teeth with an end mill might be “good enough.” Provided your shop has a machining centre equipped with a rotary indexer, or a Y axis mill-turn lathe, most CAM systems can generate an accurate series of toolpaths when presented with a solid model. In today’s world of low part volumes and expectations of quick turnaround, there’s one problem with it: what to do when the right hob is unavailable. Gear hobbing is a mature, dependable process that produces spur, herringbone, spiral, and other types of gears quickly and accurately. Gear milling is a timesaving alternative to hobbing
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