Three Evolutionary Sequential Lego Technic Gearbox’s, 6 Speed, 8 Speed and 10 Speed

As the title shows, we have three gearboxes which have evolved from the humble 4 speed Sequential Gearbox
The first gearbox includes the standard 4 speed Sequential Lego Technic Gearbox plus the addition of Reverse, Neutral and Drive (R-N-D) functionality
The second Gearbox was built after I was messing with Microsoft’s Excel where I’d created a gear tooth calculator for the ratio
This enabled me to find a new step so the 8 speed gearbox really added an overdrive section so none of the gear ratios overlap as is quite common with the standard 8 Speed Sequential Lego Technic Gearbox
My unique 8 speed Lego Gearbox 1st gear is a genuine 3.1 ratio
This then got me thinking about adding a R-N-D functionality to this gearbox
With quite a bit of tweaking and redesigning, the last gearbox in this trio has both aspects of the above Lego gearboxes included
As you’ll see in top drive, the gears are so free, they even stop meaning this gearbox should be fine for manual uses too
It’s amazing how large the Stepper system has to be to run a sequential gearbox especially when you consider we only have 3 more gears compared to the original R-N-5 clicking gearbox
Let me know what you think in the comments and if you like my little Lego MOC’s why not like and subscribe
#lego #legotechnic #gearbox
If you like this Lego Gearbox, why not check out a few more I’ve created
• Lego Gearbox

[@KiraTheFox77]

That's cool! I should do that with my legos. I have some vehicles in DIRE need of this

[@Legotyres]

I’ll be making some free instructions at some point which will be available on rebrickable under the profile @Legotyres 😊

[@KiraTheFox77]

That would be awesome! Thank you! 🙏

[@user-yj4fe3dm4b]

Even the “humble” one is better than any gearbox I have managed to scrape together from my small stash of gears.

[@Legotyres]

When I get time, I’ll create some free instructions on rebrickable 😊

[@user-yj4fe3dm4b]

@@Legotyres Thanks, it’l work great for a realistic car transmission and dashboard that I am working on.

[@Legotyres]

I’ve started creating instructions for you! It’ll be the 8 speed first, then I’ll do the Sequential 4 speed gearbox with Reverse - Neutral - Drive with separate steppers selectors
Once I’ve sorted the teething issues of the big gearbox, I’ll create instructions for that one too 😊

[@user-yj4fe3dm4b]

@@Legotyres Thanks!