Fully adjustable camber/caster for TT-02

[Pylon80 4226]

I thought I would share quickly my latest TT-02 iteration. The idea was to have a fully adjustable chassis that uses standard  - rather than type S - TT-02 parts. Also I wanted to make sure the original parts would not require complex modifications and that the number of custom parts would be reduced to an absolute minimum. The result is also mechanically "clean" in that there is no unwanted change in caster as the suspension compress. The extra holes on the plate allow adjusting roll center when using type-S shock towers.

So here it is! I am quite happy with how it turned out. I can now dial in camber, caster, bump steer and Ackerman.

 

[TurnipJF 10812]

Looking very neat and tidy!

[RC Perspective 527]

Nice! I've been using the forward facing links for Caster and the whole adjustable arm for camber. 

No top plate needed for the front. Can alter the angle depending on the ride height with spacers/threaded posts.

A slop free front end on a TT02 is nice 

I'm also a big fan of the Type-S steering set. I've got it on the R above too.

-RC Perspective

[Pylon80 4226]

19 minutes ago, RC Perspective said:

Nice! I've been using the forward facing links for Caster and the whole adjustable arm for camber. 

No top plate needed for the front. Can alter the angle depending on the ride height with spacers/threaded posts.

A slop free front end on a TT02 is nice 

I'm also a big fan of the Type-S steering set. I've got it on the R above too.

-RC Perspective

I saw TT-02's with forward facing links on RCTech a couple years ago. It's an easier route but caster will change as the suspension compresses. This is because the attachment points on the bumper are not at the same width as the attachment points of the camber links. That won't stop the car from driving well. In fact this is sometimes a compromise that even Tamiya makes: the F104 F1 chassis are like that for example. But I wanted to get the cleanest kinematics that I could.

[RC Perspective 527]

18 minutes ago, Pylon80 said:

I saw TT-02's with forward facing links on RCTech a couple years ago. It's an easier route but caster will change as the suspension compresses. This is because the attachment points on the bumper are not at the same width as the attachment points of the camber links. That won't stop the car from driving well. In fact this is sometimes a compromise that even Tamiya makes: the F104 F1 chassis are like that for example. But I wanted to get the cleanest kinematics that I could.

Sounds about right.

On the setup station after adding the Mini CVA's and setting the ride height high with the hubs, then dropping it down a little via shock position, I was able to achieve no appreciable caster change on suspension compression/rebound by setting the links to a neutral position at ride height, and slightly stiffer springs to limit the travel range. In order to change the caster, I'd have to be going fast enough to flip when turning.

I'm not racing it, but speed running/general bashing, So I doubt I'd really notice any difference between the two setups.

The compression and rebound caster change could be manipulated to an advantage If I'm thinking about it correctly. Almost like a reactive camber setup, but with caster instead.

Either way though, it really cleans up the front suspension slop.

I may be able to use your design on my drifter, As the front attachment point is blocked because I moved the upper shock portion to the body post location. The Square Drift steering needs some slop removal. Could also mount the Gyro on it too!

-RC Perspective

[Pylon80 4226]

37 minutes ago, RC Perspective said:

The compression and rebound caster change could be manipulated to an advantage If I'm thinking about it correctly. Almost like a reactive camber setup, but with caster instead.

You got that exactly right.

I am happy to share the file if that helps. I had the plate cut by Fibre-lite but haven't put it on their website as I didn't want to interfere with the outstanding work that our friend @qatmixhas done already.

[RC Perspective 527]

Just now, Pylon80 said:

You got that exactly right.

I am happy to share the file if that helps. I had the plate cut by Fibre-lite but haven't put it on their website as I didn't want to interfere with the outstanding work that our friend @qatmixhas done already.

Good to know the suspension theory stuck in my head 

That would be awesome!

@qatmix Has put in some incredible work! Though I don't think he would mind as that's what the community is about; Sharing knowledge and progress. I certainly don't speak for him, but same goes for the Aero stuff I've been designing; it's Public Domain Dedication as I would love to see others expand on the chassis/body combos I have already covered.

As a collective, the community can design things that would only be rivalled by major companies. One of the reasons I absolutely love the onset of 3D printing.

-RC Perspective

[twaleta 161]

On 7/13/2022 at 9:36 AM, Pylon80 said:

 

 

[twaleta 161]

On 7/13/2022 at 9:10 AM, RC Perspective said:

Nice! I've been using the forward facing links for Caster and the whole adjustable arm for camber. 

No top plate needed for the front. Can alter the angle depending on the ride height with spacers/threaded posts.

A slop free front end on a TT02 is nice 

I'm also a big fan of the Type-S steering set. I've got it on the R above too.

-RC Perspective

Looks nice! do you have the sizes or lengths for the screws/turnbuckles (and also the plastic spacers on the bumper and the ball nut thingies the turnbuckles connect to?) Im using stock bumper

[skom25 2389]

On 7/13/2022 at 3:35 AM, Pylon80 said:

I thought I would share quickly my latest TT-02 iteration. The idea was to have a fully adjustable chassis that uses standard  - rather than type S - TT-02 parts. Also I wanted to make sure the original parts would not require complex modifications and that the number of custom parts would be reduced to an absolute minimum. The result is also mechanically "clean" in that there is no unwanted change in caster as the suspension compress. The extra holes on the plate allow adjusting roll center when using type-S shock towers.

So here it is! I am quite happy with how it turned out. I can now dial in camber, caster, bump steer and Ackerman.

 

It was long time ago, but maybe you remember. To adjust camber, you used standard ball nut and M3 screw. Hole for suspension arm has 5 mm. Which part you used as an adapter?

[Pylon80 4226]

6 hours ago, skom25 said:

It was long time ago, but maybe you remember. To adjust camber, you used standard ball nut and M3 screw. Hole for suspension arm has 5 mm. Which part you used as an adapter?

Oh I still have that car actually!

To make the adapter I used a piece of aluminum standoff cut I the right length (search "M3 rc drone aluminum standoff" on eBay). It was exactly 5mm diameter. I slipped it on an M3 screw. The screw was a countersunk one (flat head) with an aluminum dimple washer.

I really need to make a build thread for it one day. There's a lot of interest in the TT-02.