OCSM Sim (2dof + traction loss) project

Hi everybody!
In behalf of my association I would like to present the project we have been working for a while.
It is basically based on RacingMat concept, with some minor improvements related to allow movements for wheel, pedals and shifter (our association is involved in social activities with children and elderly people) and the addition of traction loss.
As this is the first ever built for everyone working on this project, we spent lots of time in designing how the whole structure should eventually be.
Here is a render we made after weeks burning our brains out: .
Please do note that every part in this image is in perfect scale (what an over thinking..).
Despite this, the structure appeared to be too heavy, so this design has been slightly abandoned over time, resulting in a simpler and lighter structure that we are just starting to build. Hopefully our weak wiper motors should last longer.
Here are some sketches of the top part we are working on in these days:
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Some others modifications will be surely needed and I will keep up to date this thread as they will be implemented in reality. When the project will be finally ready, I will also post quoted drawings, hoping to do something useful for the community.
Talking about electricity, we decided to use the well-known duo Arduino + Motomonster with two powerful (but maybe slow) 12V 200W wiper motors from a junkyard.
I would like to show you a video () of the circuit and the top speed this motor can achieve at 12V.
I think it is too slow. What's your idea?
Perhaps I can consider switching the circuit to 24V to double the speed, but I will need a new H-bridge.
I am really puzzled about this point..also because I've to bear in mind that I need to add another motor for the traction loss...

Thanks to all of you guys for the attention!
And sorry for my messed-up english.

Buy the 12v 200 watt 25.1 gearbox motors instead. 3 times the speed and more power than wipers

Hello !

If your motors are powerful, but slow you can use them on only 120° (or less) instead of 180° and increase the size of cams.

If you want to use 24V, I recommend you to use a Sabertooth (2x25 or 2x32), I wrote a code to use Ard + Sabertooth

I forget to tell you that you can buy Smolka 24V : 16Nm@48rpm for 50€ each !!

Hi
With the concept of RacingMat therefore any mobile I advise you to switch to 24V

You can take the same engine as RacingMat "smolka 24v" the same card arduino.
it will not be a monster moto shield card controller but pololu or Saberthoot

https://www.pololu.com/product/2507

For the power supply you taking this power typer:

http://www.shop2tout.com/power-supp...limentation-a-decoupage-regulee-100-240v.html

Your simulator will be more responsive, and for the purpose traction loss 12V I think that the turn will be a little soft.
good luck

I looked at the video, thats way too slow.
Granted a 24v h-bridge is probably cheaper than faster motors, however, with wipers, they will only run 50-60prm if run at correct voltage. If you run 12v through a 24v motors, you get half the speed and half the torque.

Only a suggestion to buy faster motors,
150rpm compared to 50-60prm.

150 rpm is really fast

You are going to reinvent the catapult

I run on a seat mover 150-180rpm with only 80 deg of the 180 deg usable (0.1sec to go from max to min), for sure results in a rattle of a rig, In full 2DOF like planned not sure if the inertia of catching the weight at those speeds would be a good result for these motors and rig, plus the rider. Fairly rare to get those type of speeds to work on full 2DOF, but are just perfect for a seat mover built for racing only.

I would look at 24v or even higher ratio gearboxes on decent motors , wipers seem to fail or get slower in speed over time, some seem to go forever thou. All depends on the hours in use and how its all balanced.

As rob says, the speed gives us incredible fine vibration and reaction. Obviously you have not read or seen many other videos or posts of people sims with faster motors. Theres more out there than Racingmats "invention"
14 sim builds later I hope I know a bit more.

I trust you ! It should be very responsive !
I like the motors Smolka because they are not expensive (50€ 55$), and when I built my first motion rig (3 years ago) it was very important . I use them on 120° and I can feel the vibrations of the road holes.

But of course with faster motors you can feel more !!

I will seek your rigs, I'm sure it will be ver interesting !!

Thanks bsft, Wanegain and michto35 for the help!
With my actual motors I can get 60 rpm at 24V (but maybe more torque than Smolka motors). That's the maximum speed I can achieve at the moment.
Unfortunately there isn't a cheap way to change cams on my motors (if I got the word cams right..) and there's no money enough to buy two new motors.
The only solution seems to be going doubling the voltage and buying a newer H-bridge. In this regard, there's a huge difference in price between Sabertooth and the Pololu; does the sabertooth worth this difference?
One more question: I can get 24V using two pc power supplies in series (I have lots of them). Is there any particular attention I should care about when using this configuration? I'm a bit afraid when motors go reverse..

Thanks again guys!
Marco

So faster is better...
..just to have an idea, does anybody know where the motors bsft suggested could be found in Europe?
I've made a quick research on ebay but the results were nothing..

If you can get 60rpm@24V you don't need to change. I mean, you can use them if you have them already !

The difference between Pololu and Sabertooth, is that you need 2 Pololu for each motor (you can read : can deliver a continuous 12 A (30 A peak) per motor, or a continuous 24 A (60 A peak) to a single motor connected to both channels) ! You need only one Sabertooth to drive 2 motors and can be connected using a serial communication to Ard.

As said wanegain the 24v smolka are good engines cost, I also recover Meg breaks and they play the gear must therefore fall on good with luck.

@bsft is using these motors : https://www.motiondynamics.com.au/worm-drive-motor-12v-24v-200w-180-rpm-20nm-torque.html

Incredible motors, I need to try them (but a little bit expensive if you add shipping cost)

Thanks again guys. Yes I already have the motors (the guy in the video is actually me ).
I'm actually wondering if would be economically more convenient to buy a 24V h-bridge or save some money and go directly to the motors bsft is using with success.
Unfortunately the motors I have are old and quite weared out thus this makes the decision harder..I cannot estimate how much they will last in a sim..

My pololu driver two engine the same way as the monster moto shield but 24V
It does not take me 2 engine map as pololu JRK 12V

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Ma pololu pilote deux moteur de la même maniere que la moto monster mais en 24V
Il ne me faut pas 2 carte moteur comme les pololu jrk 12V

For that you need to know what is the current needed for your motors... Maybe 12A continous is very enough, but I prefer to have a safety margin

The jrk is listed as 12a cont. it will run 30 amps cont with 45 amp spikes No problem

Good to know !