panurge
10 kW
Are you looking for a model of the female spline shape (cog & adapters) or for the male driver? they're obviously different...
For the female interface here's a very good model. http://www.peterverdone.com/hyperglide/
Remember that although Hyperglide is a standard, the 9 spline interface is in fact a "pseudostandard" especially for the inserts with many slightly different interpretations over the decades, a very lax interface with big tolerances, mostly depending by the locking interface.
Note that If you don't intend to make synchro-clusters, there is no need for the small spline: a regular 9 spline shape is easier and equally good.
However, If you intend to make a male driver, the exact Hyperglide shape is needed, to insert HG cogs.
For the female interface here's a very good model. http://www.peterverdone.com/hyperglide/
Remember that although Hyperglide is a standard, the 9 spline interface is in fact a "pseudostandard" especially for the inserts with many slightly different interpretations over the decades, a very lax interface with big tolerances, mostly depending by the locking interface.
Note that If you don't intend to make synchro-clusters, there is no need for the small spline: a regular 9 spline shape is easier and equally good.
However, If you intend to make a male driver, the exact Hyperglide shape is needed, to insert HG cogs.