{"data":{"fields":"term_definition","term_definition":"<div class=\"definition\">Gear tooth standards are customarily described by the basic rack with all linear dimensions based on the module or given for 1 DP. Linear dimensions for any other pitch are proportional, that is: addendum = constant x module, or constant D.P. The pressure angle will be the same for all pitches. Standardized tooth proportions include addendum, dedendum, circular thickness, clearance, and fillet radius. Bevel gear systems are not as restricted as systems for spur gears and helical gears, because the pinion is practically always derived from the gear and both members are matched together. Besides, the methods of bevel cutting make it very easy to alter addendum proportions and tooth thicknesses.<\/div>"}}