Frex SimWheel

I found what is the part with the orange gear ring, that is connected right after the motor shaft...

http://www.nbk1560.com/couplicon/produc ... ex_en.html

Its a Zero Backlash, Soft Flexible Coupling !!!!!! :lol:

The question that remains is how it connects to the main screw...

Thanos

Great find Tronic! How did you work that one out.

So the reduction in backlash is just caused by having a flexible coupling?

We can't see where it's transmitting the drive to yet until someone gives a clearer pic.

I think I've figured it out.

The tiny motor on the back is imho just for cooling purposes!

They seem to use a linear motor system like those from SEW Eurodrives! These are motors with massive torque, are fast as hell, are silent and have no rotational parts (they call it motor, but it is more a magnetic rail, than a conventional motor).
Such motors are used for example in the carmikaze simulator!

playtime 2:48

http://www.youtube.com/watch?v=r97E_QvCoQs

It's likely that such a linear motor powers the slide on the rail, I think.
Otherwise I couldnt explain how they could be able to achieve that much torque.

Regards
Christian

http://en.wikipedia.org/wiki/Linear_motor

It could be a linear motor system on the bottom, but it would have to be very compact and its another thing... I don't see any cables coming out of the bottom, where it should be this motor!



(another enhanced photo of the motor...)


Thanos

good point

Regards
Christian

Hi
they are not the only one.

If you think about it every thing speaks to my version with two screws Soft Flexible Coupling is connect to smaller screw. If you look at picture there is another bearing. Gearing is do by difference in pitches and diameters of screws. We cant just see (i hope)

EDIT: Linear motor wuld be faar more expensive, better way is BLDC motor.
EDIT2: I want this baby http://www.mmspektrum.com/multimedia/im ... 25_big.jpg that would be FF D (most powerful has around 20 000 Nm from 0 rpm )

That system is, from what I see, more a rumbling system, than Force Feedback device.
Do you have a link to the manufacturer?

Hi. Ego
they write force feedback
there site is http://www.racingsimulators.com
regards Ad.

Well, cyberspace, the company who invented/sold the RnR promoted it as Force-Feedback device as well, though it was joystick controlled in the end.

But the wheel you linked has Force-Feedback obviously. It can be seen in this video.

Regards
Christian

Hy.
Ye you are a head of me with the video.
They made it far more easy than Frex.
Regards Ad

But their system does not support more than ~280° whell rotation, while the Frex one is multiturn.
Not really comparable.
But for those who are satisfied with restricted wheel rotation, like for F1 or Dragsters, it will do the job.

Hi Ego
It isn,t difficult to give it adjustable steer clearence.
one little gearwheel on the steershaft with 10 tooth for example and a 32 tooth for the end locks
when the big wheel have allso 32 holes you can put two pins in it for the lock
and it,s easy to adjust the clearence by putting the pins in different holes.
regards Ad

Why don't we concentrate on what ShigeT told, when started designing it:

(Edited a little the sentence in red to make it more meaningful)


Then, what way is left yet? And small enough to be able to hide from the photos taken from clarkii2??


Thanos

In case it isnt a linear motor, then it is made like Mambo suggested.
A second spindle that drives the slide, which is connected to the coupling.

Regards
Christian

Hi
When i look at the picters i still don,t get it ,with the second shaft
I see a coupler and bearing, but a smaller shaft is useless ore it must be for avoiding tilting the slider.
But the roller shaft is so big the zero backlash nut will avoid that
I see no function for a second shaft and makes it complecated for nothing.
regards Ad

Small shaft dont avoid slider, in slider there is another nut witch is connect to big nut when motor spin, small nut slide (for example) right and big nut also move right. Movment of big nut makes big screw rotates. Bigscrew has high pitch (a gess about 80 mm per one rotation -it looks like multi screw-thread ) so thats mean if you turn whelle one turn nut make 80 mm travel and smaller screw must rotate more (if it has pitch 5 mm then must rotate 16x more) thats make the transmission.

Hi Mambo.
I know what you mean, but you can do this all without the second shaft ,only with the big shaft.
why put a second shaft in it.
regards Ad

Just to mention that if second shaft/screw is used, it has to have the same pitch, otherwise one nut (high pitch) will try to move faster than the other nut (small pitch)!!!!

It must be another way of coupling the motor to the big screw!

Thanos

Btw, I noticed that while the is a bearing on the left (below the big screw shaft), there in no bearing on the right side end!! This eliminates I suppose the possibility for second small screw shaft!

the idea of a second shaft is cool but.

There's no space for it in the pictures, it would have to be inside the shuttle at the bottom which it isn't cox the motor isn't aligned there.

As tronicgr said you would not be able to turn the wheel as the small screw couldn't be back driven. This would mean you'd need a torque sensor so you could control ALL movement from the motor in response to torque on the wheel.
(I love that idea but doubt it's being used here?)


Whatever the answer is, it's only about the size of a large matchbox and is hidden from view due to the angle of those pictures... Connected to the right side of the flexi coupling and going into some sort of bearing in the ali block.

Shige you evil genius... What have you done?!?!?