[WillowTheWhisp]

Originally Posted by jambutty

The outer rim doesn’t have cogs – it is itself a cog and it is locked.

OK, I meant teeth, The teeth being interlocked with the other teeth. I knew what I meant.

Originally Posted by Neil

This explains the gears a little better willow. Look how the outer gear is part of the gearbox casing so is held stationary. the 3 inner gears are fastened on a common plate and to the output shaft.

Epicyclic gearing - Wikipedia, the free encyclopedia

Yes, I suddenly had a blinding flash in which I saw it differently, hence my follow up post saying 'ignore that'

I'm still on the side of suction though.