6dof - motors vs linear actuators vs 3dof

i have been toying with the idea of building a stewart platform that is 6dof

i have some questions for the guys that have built a 2dof and a 6dof

A. is it true that a 2dof gives more realistic cornering vs a 6dof ?

When i look at a professional sim they seem to have very limited movement and the better ones use lots of tricks like airbags / g seats to fool the driver -

B. do we really need lots of movements ?

C. plently of professional sims use levers and motors rather than linear actuators - the holy grail seems to be a 6dof with linear actuators why is this the best design ?

i really like the look of this sim - does anyone know if it is diy or pro ?

this one is quite neat too --

big motors on this one !

the videos you posted I believe all used AC motors. I tried factory made 6dof and 4dof sim using powerful AC sever motor driven Actuators. They are ok for flight sim but not for racing car sim though, IMHO.
In fact I felt that by using simple SCN5 actuators for 2dof is far better than those 6dof sim by using power full motors on racing car sim.

Here are two videos you can side to side compare:

The second video - is that a scn5 ?

lol this again joe.
the video proves nothing they are running different data. its not the same. if you try to use videos in place of scientific quantification (actual numbers and measurements) for comparison you will be WRONG. what is that second video anyway?
The scn5 will reach a maximum unloaded speed of 400mm per second. we are pushing these DIY ACTUATORS to over 900mm per second unloaded the scn5s are a great turnkey solution but do not even come close to the torque and speed of our actuators. as far as trade off the only force that the 2dof simulates that a lever 6dof cant as easily is roll in the turns. the diy actuators can also simulate this because of the long working length of the pushrod. the 6 dof can simulate heave, surge and sway for the entire rig not just move the seat forward and back in the seat as in joe's seatmover.
I would stay away from building a lever actuated 6dof though and explore the diy actuator.

the speed you refer to i think is at non-reversed point speed. The speed for reversal of three phase ac motor is far slow than that of dc motor. this is my point....

I agree that ac motors are a waste of money. DC is the way to go as far as bang for buck.

.four actuators on four corners doesn't make sense to me. Kinda like a table with one short leg. What happens does it just lift one actuator off the ground or does the chasis flex. Three would make more sense. But nonetheless a stewart platform is way more agile than either.
TBH tho I'm not going to debate the effectiveness of a platform vs a seatmover. Its been done. I believe that op is asking about full frame rigs.
Also take a poll of the guys that went from 2dof to 6dof. Do you see them saying things like "my 2dof was better" or do you see guys getting rid of 6dof for a 2dof. I don't think I have ever seen this. I realize you love your sim bud and thats awesome but my 6dof is way better than my 2dof was.

I refered to my very specific experiences on the day I tried both sims side by side at Chicago Auto show. This is my subjective conclusion. I know you love your 6dof rig and love your dc motor solution. I dont. I love 3dof and SCN actuators. I am rebuilding my rig with 5 SCNs. It turns to pretty much personal...no reason to national...
So, lets just move on....

EDIT:
Hey @joe extraknow your rebuild would be great to see. regardless of our individual opinions I encourage you to start a thread and share your build.

neat 3dof --

To the people who have went from a 3dof to a 6dof, does the driving feel better and more realistic? for flying it obviously does but i wanna know if it's worth upgrading to a 6dof for games like dirt, ATS, project cars 2, assetto corsa, etc.. i have a 3dof from dofreality and now they're selling a 6dof upgrade. So can anyone here please give me their experiences from a 6dof? @noorbeast do you know where i can find a list of all the people in this site who have a 6dof? i just know @SilentChill has. Any thoughts or opinions are appreciated, even if you don't own a 6dof!

The difference to me was massive you get so much more from a 6DOF , well 3 more true 3dof feeling. The 6FOF from dofreality doesn't look that great for €5000, I could build 2 really good 6dof linear actuator platforms for that price. In fact you could probably build a big AC rig for that price.

Each to their own I suppose and thats just my opinion.

ohh that's great. was the difference massive EVEN in driving sims? and btw i have the 3dof from dofreality, so i need to pay them only $2500 to upgrade to a 6dof, not €5000. Forgot to mention that in my original question here. Reckon that's a better price and more worthwhile price?

can we see pics and vids of your sim

what type of motors / gearbox does it run ?

I have the same 3dof as this guy:
think it's called a "worm gearbox"

Did you ever go 6Dof @Mpmo ???

nah still waiting on reviews on the new 6dof upgrade for the dofreality rig, you?