What are involute splines? Involute splines are commonly used to attach a gear to a shaft. Normally, involute splines are made in pairs, an external spline and an internal spline. Internal gears. Creating internal gear sets has been improved with GearTrax. It is easy to create a set of gears, one internal and one pinion gear as a matched set. A spur gear tooth and involute spline tooth geometry can now be added to any sketch in CAD. This makes it very easy to add gear teeth to any part or multiple teeth geometry to a single part. Spur and helical gear teeth are cut-extruded rather than the tooth feature boss-extruded on a base feature.
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