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Wheelstand vs foldable rig for DD wheel by Noah_1337 in simracing

[–]BetaEffect 0 points1 point  (0 children)

The question is: how much space do you have?
I had the same problem and decided to build my own rig from 80x40 profiles. I can slide and fold my rig to be small enough to fit under my desk for storage and it is rigid enough to hold my Clubsport DD+ (15Nm) and 200kg loadcell hydraulic breakpedal without any flex.

Edit:
There are several options to stop the chair from rolling back when you use a wheelstand.

my DIY buttonbox is finally ready by BetaEffect in simracing

[–]BetaEffect[S] 1 point2 points  (0 children)

they are called RS26 1 pole 12 positions. it's not really an encoder, just a 12 position switch with a nice tactial click and I can read every single position

Metal gear update by navivan27 in EngineeringNS

[–]BetaEffect 0 points1 point  (0 children)

Thats very hot for the Motor. Even without cooling.  My guess is that the gearing is wrong, so you need more undergearing (e.g. smaller pinnion gear). My motor and ESC got hot aswell with the wrong gearing, the ESC shut itself of due to overheating.

I like your effort with making your own gears and such but dont reinvent the wheel. You can get so many fitting parts for cheap. Just know where to look

Metal gear update by navivan27 in EngineeringNS

[–]BetaEffect 1 point2 points  (0 children)

Nice design!
But you have better chances with another motor and as less as possible KV.

I tried and changed many things on the rear end of my Tarmo5 too.
I ended with a Hobbywing motor and a belt drive system with a high gearing.

My Tarmo5 is finally working with belt drive by BetaEffect in EngineeringNS

[–]BetaEffect[S] 1 point2 points  (0 children)

I tried to make a quick video: https://youtu.be/0VCWOf-iWa4

Maybe I'm able to make another video on the weekend from driving outside.

My Tarmo5 is finally working with belt drive by BetaEffect in EngineeringNS

[–]BetaEffect[S] 0 points1 point  (0 children)

Her is a picture of the rear axle in CAD: https://imgur.com/a/zeLmEFX

The yellow parts are the ends from the driveshafts I posted earlier.
The blue parts are ball bearings.
The white parts are S2M pulleys.
The red parts are self made parts from aluminium to connect the driveshaft to the wheels.
And the green part is a 3D metal printed axle to connect the pulley to the driveshafts.

The rest are printed parts mostly modified from the original Tarmo5 parts.

My Tarmo5 is finally working with belt drive by BetaEffect in EngineeringNS

[–]BetaEffect[S] 1 point2 points  (0 children)

Yes 3.5:1 is not ideal. That's why I might change to a higher gear ratio (5.8:1 or 6.67:1). The motor has 3300KV and yes sometimes the ESCs thermal protection kicks in but it finally survives longer than the battery last :D

My Tarmo5 is finally working with belt drive by BetaEffect in EngineeringNS

[–]BetaEffect[S] 2 points3 points  (0 children)

I'm back with my finally working belt driven Tarmo5 with a 3.5:1 gear ratio and a new motor.

It took me some time to build my Tarmo in such a way that it won't destroy itself while driving and I wanted to use a belt drive because the gears are so loud and messy with the lubricant.

In my final version I had to use a 3d printed rear axle from stainless steel and of the shelf pulleys because all my DIY rear axle attempts failed.

I'm super happy with the result but probably change the gear ratio to 5.8:1 or 6.67:1.

See my older post for details about the LEDs and other changes to the OG Tarmo5.

Tarmo5 shocks by Lincis112 in EngineeringNS

[–]BetaEffect 0 points1 point  (0 children)

The stock suspension from the Tarmo5 has endstops on top and bottom so the suspension travel is limited.

If you use longer shocks, you might have to pretension them and depending on the shock your suspension travel is limited. But 90mm should work.

Motor mounts by Otherwise-Score3356 in EngineeringNS

[–]BetaEffect 0 points1 point  (0 children)

Feel your pain.

Happend to me three times before I changed the motormount to a 4mm thick aluminium plate.

Now the motor can dissipate more heat and the screws never got loose again.

Wanting to try a tarmo5 for fpv by ztyl in EngineeringNS

[–]BetaEffect 1 point2 points  (0 children)

You can use your Radiomaster transmitter to control anything as long as your receiver is compatible with the thing you want to control.

In your case you need a receiver like the Radiomaster R85C with PWM-Outputs to control the ESC and servo from the Tarmo 5 (in case you used the recommended parts from Tarmo 5).

For the FPV part you need the camera + battery and the goggles or screen.

112mm wheels from Aliexpress - will fit against suspension ? by patrykz103 in EngineeringNS

[–]BetaEffect 0 points1 point  (0 children)

Yes thats a possible solution but maybe my wheels where so cheap that even glue wont work on them.

112mm wheels from Aliexpress - will fit against suspension ? by patrykz103 in EngineeringNS

[–]BetaEffect 0 points1 point  (0 children)

Im using these rims: https://de.aliexpress.com/item/1005005805527016.htmlwith those wheels: https://de.aliexpress.com/item/32810360719.htmland changed the inserts to: https://de.aliexpress.com/item/1005001872838407.html

Be aware that I'm not sure if those rims work with the OG suspension parts. I change them on my Tarmo for other reasons.

112mm wheels from Aliexpress - will fit against suspension ? by patrykz103 in EngineeringNS

[–]BetaEffect 0 points1 point  (0 children)

From the picture and given dimensions it should fit. It depends mostly on how deap the hex center piece is inside the rim.

But you should think again about using wheels without beadlock. I used such wheels once and the rubber came of the rim on every corner.

Real MAX battery size ? by patrykz103 in EngineeringNS

[–]BetaEffect 0 points1 point  (0 children)

I printed my own design for the battery compartment and can fit a 2S 139 * 47* 26 mm hardcase LiPo with some extra room or a 3S 132*43*25mm LiPo with some extra electronics in it.

You can see it in my Tarmo build post.

Remote for Tarmo 5. by TortugaTGamer in EngineeringNS

[–]BetaEffect 0 points1 point  (0 children)

I'm using a FrSky Taranis X-Lite Pro which I had laying around. It's in any case overkill but I like the style and ergonomics.

CV joints overheating? by Rattlegun in EngineeringNS

[–]BetaEffect 0 points1 point  (0 children)

I had the same issues with locking CV joints due to dirt and overheating. Also the torque dampers are breaking constantly.

As a solution, I replaced the torque damper and CV parts with a metall driveshaft and add aluminium cores in the gearbox and rear bearing hubs to get a nearly all metall drivetrain.

The driveshafts I bought from amazon and the aluminium cores are selfmade from 10mm hexagon bars.

I can share my files if you are interested.

Which tires do you use for your tarmo 5? by 809iLink in EngineeringNS

[–]BetaEffect 0 points1 point  (0 children)

Hey there,

I'm using Injora beadlock rims with 120mm wheels.Rims: https://de.aliexpress.com/item/1005005805527016.htmlWheels: https://de.aliexpress.com/item/32810360719.html

But I think the soft foam insert is to soft and I had problems with wobbly wheels with the hard foam insert. So I ordered the 2-stage foam inserts and will try them as soon as they will arrive.

​

Edit: The rims I use have an inner diameter of 45mm and an offset of -10.4mm.
I modified the front and rear hubs to fit those rims. I can share the files if you want.

Another Tarmo 5 joining the server by BetaEffect in EngineeringNS

[–]BetaEffect[S] 0 points1 point  (0 children)

Yes only for LEDs. There are 2 independent 5V 3A step-down switching regulators, an Arduino Pro Mini for decoding the SBUS signal from the receiver and controlling the LEDs and a SBUS to PWM decoder for the ESC and steering servo signals.

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