Floriske.nl's 2DOF Playseat GT Wiper motor Project

[floriske]

I have thought about gas struts, but they are more expensive and not adjustable.

Regarding yokoyoko's remarkt about the balance point:

Finding the balance point is important for sure, but as soon as a platform style sim is tilted it "falls" out of balance (same happens with a seat mover but with less shifting weight). Here's a sample doc I made for someone else a while back:

Use of springs.jpg (186.92 KiB) Viewed 5273 times

In the most ideal situation the center of gravity and pivot are on the exact same spot, this would require the least force to move it around.

Hence my remarkt about the fact that I would have mounted the pivot through the platform and underneath the seat instead of underneath the plaftorm if I would do a same sort of build again. In my case the center of gravity is quite high above the pivot.

[vicpopo]

Hi Floriske,
I updated my topic ,look at the bottom I attached new pictures which could maybe give you some ideas.
http://www.x-sim.de/forum/viewtopic.php?f=37&t=254
Best Regards

[motiondave]

Can I mention that I used springs under a frame early on. But it was with wipers and was not for balance correction. It was for helping the wipers cope with the direction change better.
I found that the soft gears in the wipers got backlash and wore out fast.
The spring idea was to create a small load on the wiper and help keep the gears meshed.
It worked very well and stopped my wiper motors being chopped out.
Since going to big worm gears I found the springs, for me, not needed as the gearboxes proved to be strong enough to handle constant and harsh direction change.
Just what I found out, thats all.

[floriske]

In your case your balance point is a lot lower than in mine (as mentioned sort of a flaw in my design that I would have done different if I had to do a new build). In my case more weight shifts while tilting and the springs are a precaution for "reducing" this weight. But you are absolutely right: springs are no must have with big motors, just helpers.

[Battlestar]

Hi floriske,
I am constructing a similar simulator to your design - a platform mounted on a universal joint. I have pretty much found the point of balance, but like yours, the centre of gravity is well above the pivot. I have 12v wormgear motors to use, and until now, I didn't think of using springs. Would you say from observation that its better to have them than not. I would appreciate your input.
Cheers,
Mike

[floriske]

I have only thoroughly tested the difference with and without springs when I was still using wiper motors, and yes they made a great difference. The sim felt more responsive and faster with bigger spring tension as it did with lower tension.

With the new wormgears I didn't do any more testing, but they helped with the wipers I reckon they will help with the wormgears as well.

One small extra advantage of the springs is that, if the motors power is cut, the sim tilts to the direction it was in at that point or where I shift my weight to a little slower instead of suddenly dropping over.

[motiondave]

In your case your balance point is a lot lower than in mine (as mentioned sort of a flaw in my design that I would have done different if I had to do a new build). In my case more weight shifts while tilting and the springs are a precaution for "reducing" this weight. But you are absolutely right: springs are no must have with big motors, just helpers.

Whats the height between the base and the bottom point of the pivot?
I have done a lot of frames, from 140mm to 400mm high in frame height.

[warstyl]

Hi Floriske ,
I am impressed with your simulator design ,very very impressive .I studied your design in the early stages while trying to design my simulator rig and beside doing a direct copy I thought it would be great to be original and different and come up with something of my own ,However your have some brilliant design features which do not allow for much improvement besides redesigning another different concept .
Really and truly awsome !!

[floriske]

In your case your balance point is a lot lower than in mine (as mentioned sort of a flaw in my design that I would have done different if I had to do a new build). In my case more weight shifts while tilting and the springs are a precaution for "reducing" this weight. But you are absolutely right: springs are no must have with big motors, just helpers.

Whats the height between the base and the bottom point of the pivot?
I have done a lot of frames, from 140mm to 400mm high in frame height.

The chairs base, the moving base or the compete sim's base?

The first is approx. 30cm, the second approx 7,5cm and the latter approx 25cm.

Hi Floriske ,
I am impressed with your simulator design ,very very impressive .I studied your design in the early stages while trying to design my simulator rig and beside doing a direct copy I thought it would be great to be original and different and come up with something of my own ,However your have some brilliant design features which do not allow for much improvement besides redesigning another different concept .
Really and truly awsome !!

Thanks a lot for the compliments!

[spartan300]

hi Floriske,
We have the same motors, but i have rn-vn2 dualmotor controler.
Do you think this controler is not good for this motors?
thx
Loukas