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Glossary of Terms S-Z A|B|C|D|E|F|G|H|I|J|K|L|M|N|O|P|Q|R|S|T|U|V|W|X|Y|Z SB - stock bore SS - this abbreviation is used for both Stainless Steel and Set Screw, caution should be exercised in its use and interpretation. Set Screw - a socket head screw, which is screwed tight against a key or shaft in order to fix a sprocket or gear on that shaft with pressure and friction. Speed Reduction - When transferring energy from a high-speed source such as a motor to a lower speed application, some method of reducing shaft speeds is required. Sprocket and gear systems are typical mechanical methods for achieving required speed reduction through a desired combination of tooth ratios. For example: If a 20 tooth pinion is driven by a 3600 RPM motor, and the pinion in turn drives a 120 tooth gear, the ratio of reduction would be 6:1 or 1/6 of the input speed; equaling 600 RPM at the gear. If the specific application requires a lower operating than that provided by the first stage of reduction a second stage may be applied by placing additional gears in series until the desired output speed is achieved. Spiral Bevel Gears - In similar fashion to helical gears, higher potential load transmission relative to straight bevel gears is achieved with spiral bevel gears by cutting the teeth in a curved shape. Split - sprockets and gears can be manufactured by several methods, which allow them to be split in half. Splitting allows for installation of the parts without disassembling the machinery they are going into. Spur Gears - are gears cylindrical in form, with teeth that are straight and parallel, and operate on parallel axes. Strand - This is a term used to describe sprockets. A Strand is one 360° circular array of equally spaced sprocket teeth allowing continuous operation of one width of chain. Roller chains are manufactured in single or multiple widths. Multiple width chains require multiple-strand sprockets, where the strands are properly spaced to fit within the interconnected sidebars of the chain. Multiple strand chains allow transmission of higher loads for a given pitch of chain. Chains are commonly available for single, double, triple and quadruple (or simply `quad') strand sprockets. TL - Taper-Lock® Taper-Lock® - is a Registered Trademark of Dodge/Rockwell Automation and refers to a split-tapered bushing system Weld-In Adapter - a steel hub drilled, tapped and bored to fit a specific bushing such as a Taper-Lock®, Q.D.®; (also referred to as weld-in hubs) Worm & Worm Gear - Worm gear sets run on non-intersecting, perpendicular shaft axes and provide high ratios of reduction. The worm is a threaded cylindrical shaft, which drives the worm gear (also referred to as the worm wheel). Worm gears look somewhat similar to helical gears except that they have a curved throat recessed in their face to allow the worm access to the flanks of the gear teeth. Worm gears are almost always made from bronze or cast iron with the worms made from steel. This combination of materials allows for the sliding action between the gears. Worms may have a single start (continuous thread) or multiple starts. |