AT Mini: Spring-Based Truck Concept & Development Log.

I’ve been working on this truck concept for a few years and finally got to the point where I want to start sharing it.

Introduction:

It’s a spring-based design that doesn’t use a traditional kingpin or pivot bolt.

Originally I was envisioning this as a way to make an All-Terrain mountainboard type truck, with suspension. But I decided that the easiest and cheapest way for me to design and prototype it was making the smallest version I could, and I had just gotten my first 3D printer. And so the AT-Mini was born.

Here is the first video I made, with the original proof of concept:

For years even prior to this, I’d been playing around with torsion trucks, and had been completely stumped on how to make torsion springs trucks work without breaking.

Designs like this have been around since the 70’s, and I’d been fascinated by them for a while.


But they never took off for several reasons, but the biggest is because they break.

This proof of concept video was the big “Aha!” moment, where I realized what was actually going on to cause this style to never work out. And with a fresh new lead, I started out making.

I’ll be updating this thread as we go along

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Nice idea! I think suspension is the future
Have you tried the avenue trucks? Some guys use them for esk8 too

I’ve been neglecting to update this thread, so he’s some pictures.


First “ridable” prototype.


Secondary Spring idea


The whole assembly.

After a lot of work and several years I reached this point.
Secondary spring replaced with a urethane block. Polyurethane ball joints.


Testing “Wings” to limit lean.


Looking slick.


Testing reduced “wings” to limit lean and prevent hyperextension of the springs.


Worlds most comfortable Mall Grab.


Destructive Testing.

Many bent axles, broken trucks, and busted decks later.


My “Carve-O-Meter” for fatigue testing.


Truck reached failure after 1055 carves, but this truck started the test already cracked from previous brunt force trauma during last testing round.

Project has had its ups and downs, but its still looking quite promising.

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I’ve not had the chance to try avenue trucks. Every time I got to check them out they’ve been out of stock.

Nice to know that avenue trucks are usable for esk8.
I recently acquired an appreciation for how much torque there is going into the trucks from the motors, so I was unsure if Avenue’s could put up with it.

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Is that “carve-o-meter” an inductive sensor with a magnet taped onto the hanger? Pretty creative solution, love it!

Yes. I was looking browsing different counters and I came across this thing which comes as a kit for $15.

And when I saw it, I knew I wanted it showing the counter on the deck itself.

Its super fun because I show it to people, and everyone wants to put a few carves on it to make it go up. So its made it a lot easier to get people to try the trucks.

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