SIM builds and Materials USED

Any particular reason why??

Simtools runs on PC, right? Is it only Windows based?

Yes, only windows.

Wish I had seen this befor I bought the Raspberry Pi B +, Raspberry Pi 2 which has a 4 core/1 gig ram and toted as to be able to run Windows 10. If thats the case then I should be able to run simtools and Win 7. Anyway I ordered it. Won't be here til after I go back to work, so won't be able to get to play with it til I get back. Now to see how much ram it will recognize, I have a 64g micro sdcard around here someplace....

http://www.ebay.ca/itm/Set-of-2-Hea...572?pt=LH_DefaultDomain_0&hash=item2edf45f93c Need your opinion on these guys, have a look and let me know what you think, please and thanks.

Sorry, not suitable for a sim - as already noted, too slow. They also normally have just a standard screw (not a ball screw) and some plastic components.

No way @bsft This rig weighs a ton, it's built from mostly 18mm ply I've got 6 heavy duty castors under it and struggle to move it on the carpet, granted I am just a little past my prime (kidding) but I'll settle for 2dof.

Ok, so is this the consensus of all, that we need to use 400mm/sec if we are to use linear actuators and that they need to be ball screw. This is the reason why I wanted to have the pros who have built their Sims to list the components used, so as for the newbie to be able to go look for these, instead of wasting time looking for something thats not going to work. So now when I do my work log I will say if I use actuators, that they are 400mm/s ball-screw 16" long. The length to be determined by how much travel you want?

or just use the gear motor's A LOT of us use and know work flawlessly. Why are you stuck on Actuators ? Do you know they are Pretty dang loud, and sitting Directly behind your seat can be rather intrusive if you dont use a Noise Canceling Headset. ? where as gear motor's are near silent expect for VIOLENT direction changes where you'll hear a little "gear noise"

after looking at the link to the scn5 posted by noorbeast, I understand why so many are using the gear motors, wiper motors, but can see why someone would want to use the scn5's. No need to worry about pots and any thing associated with them? Basically plug and play. Those who have used these, can you elaborate.

The actuators I run are noisy mostly from bearings being worn out,, well the right hand one is, the left hand is noisy but not as much.

As I got them for free, but had to re-motor them myself , I will use them.
That being said , they move at about 250mm linear per second.
I have also run a rear shoulder mount DC motor and JRK seat mover, and yes I agree with @Nick Moxley , they are faster and quieter. Mind you the larger DC motors and JRKs can run at 300mm to 500mm linear speed per second, loaded on a shoulder seat mover, with the right settings in the JRK and a lever of 40 to 65 mm CTC.
@Rastus , my mistake, all the castor wheels you use to move it around, for some stupid reason I thought you were adding a drift frame. Nevermind.

How does this linear speed translate to (angular speed of) degrees per second in change of seat tilt angle?

Dunno! maybe @eaorobbie can explain further.
All I know is that in the JRK utility program, there is a graph that allows us to measure how fast it goes from top to bottom. And then allowing for actually how far the lever travels, say 80mm up and down, you can estimate the actual linear travel speed.
But remember, depending on design and motor placement, that 80mm travel at the motors can be more like 200mm travel at the head of the seat.

Thats what i wanted to hear. I know its all a matter of personal preference but in my opinion there should be a suggested minimum head travel distance and a minimum head travel speed that ensure imersion.

With such a suggestion new users could have a crude estimate on how their designs should be (before even going to theoretical calculations).

Problem with that is No all driver's are the same weight, Not all Setup's are Identical and not all user's want as much motion (at the head) as some users might want. Not One of us builder's said "i have to have X amount of travel out of my rig" We build it and tune it from there, And as you will soon learn, using 100% of 1 particular force, is NOT recommended.