Very good likelihood this is in the wrong place, but here goes....

Trying to setup a spinning, attachable cog. Following the steps as outlined in previously written, well known, highly enjoyable walkthroughs. Basically, what I'm getting at lower mass (0-100ish) is a cog that barely spins, but shakes like its got 200mph winds behind it....

There must be something minute, but important that I'm missing.

Go.

Edit: Material Tag is a necessary selection for functional cogs, apparently.