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Spur Gears
Click on a link below to learn more about the different types of spur gears CMG manufactures.
Spur Gear
Enlarged Pinions and Reduced Gear
Stub Tooth Gear
Internal Spur Gear
Cluster Gear
Spur Gear
A gear designed to provide uniform rotation on an axis perpendicular to the transverse plane from one parallel axis to another. A spur gear can be a cylindrical shape in and of itself or integrated as part of a shaft to become a geared shaft or pinion shaft.CMG, depending upon the size and tooling available, can either hob or shape a spur gear. We can shape a spur gear up to 22.0” in diameter with a 5.0” face width. We can hob a spur gear up to 16.0” in diameter. CMG can obtain an AGMA 10 on shaped and hobbed spur gears and up to AGMA 13 on ground spur gears. CMG can profile tooth grind a spur gear up to 15.75” in diameter. CMG can grind a geared shaft or pinion shaft up to 29.0” in length. CMG typically has tooling for diametral and modular pitches from 3DP to 32DP or .5 MOD to 10 MOD respectively.
Enlarged Pinions and Reduced Gear
Pinions with a small amount of teeth sometimes require an enlarged diameter to avoid undercut in the root of the tooth. This can be accomplished in several ways to include using an outside diameter for the next larger number of teeth. Quite often the standard center distances and pitch diameters can be maintained.Stub Tooth Gear
The Fellows Stub Tooth has an addendum and dedendum shorter than the conventional full depth tooth. The Diametral Pitch is expressed as a fraction such as 10/12. The numerator is used to determine the Pitch Diameter and tooth thickness while the denominator determines the addendum, dedendum, depth and clearance of the tooth.Internal Spur Gear
Internal spur gears, also know as ring gears have the same standards and terminology as an external spur. They are simply gears that have teeth on the inside of the blank.Cluster Gear
As the name implies, cluster gears are a series or cluster of gears on a shaft or gear blank with varying diameters. Quite often these types of gears have relationships between the different clusters of teeth or a required line-up.CMG can either shape or hob cluster gears. CMG has full CNC shaping and hobbing capabilities that incorporate timing protocols and stock dividers for location of teeth to establish proper positioning.
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