Backlash - The distance the width of a tooth space surpasses the thickness of the engaging tooth on the pitch circles of industry gears.
Bore - The diameter of the hole in a industry gear.
Bull - The larger gear of a set of industry gears.
Center Distance (CD) - The smallest distance between the axes of non-intersecting, mating industry gears.
Coupling Sprockets - Used for connecting two non-continuous shaft ends of industry gears.
Dedendum (DED) - The distance, radial or perpendicular, between the bottom of the gullet and the pitch circle on industry gears.
Gullet - The distance between the teeth of industry gears.
Hob - A cutting tool used for cutting teeth in industry gears by using a hobbing machine.
Hub - An extension projecting from the side of industry gears that creates width to a part so it can be mounted on a shaft.
Hub Style - The type of style of the hubs on industry gears. Type 'A' indicates there is no hub on the industry gear; type 'B' indicates there is a hub on only one side of the industry gear; type 'C' indicates there is a hub on both sides of the industry gear.
Module (MOD) - The pitch diameter's ratio to the number of teeth on the industry gear expressed in millimeters.
Mounting Distance (MD) - The distance from the crossing point of the axes to the location surface of industry gears.
Pinion - The smaller industry gear of a set of industry gears.
Pitch - The size of the teeth of industry gears.
Rack - A steel bar with teeth on one side where a pinion can be driven across. Also a
spur gear with an unlimited pitch diameter.
Ratio - The distance from the center of industry gears to the point where the teeth or edges come into contact with one other. It is directly related to the size of one industry gear compared to the other.
Teeth - Edges or outside of industry gears have pits and extrusions to interlock with other industry gear parts. The teeth of the industry gears prevent slippage between the gears and promote consistency and regularity in the industry gears.
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