my new motion sim with VR

[misoswan]

From what I've read it should be about as good at synthesizing the feel of pulling G-Forces as a non-360º travel motion rig with VR is at synthesizing full roll and pitch ... if that makes sense.

 

But there are people this forum that have built the G-Seat ... and more on it and those people can be found here ...

https://forums.eagle.ru/showthread.php?t=122577&highlight=Bergison+gseat (which has more links in the thread).

 

Here's a viddy of the creator with it ...

 

But I don't think if I mount one on a motion rig (by modding my existing seat with single "push/pull plates"(instead of flaps) in the seat bottom 'and' in the seat seat back) that it would require the all of the G-Seat functions.

 

Just the motorized seat belt snugging and relaxing system, with the single seat push/pull plate in the seat bottom and back being motor driven in both directions (up/down and back/forth) all working in concert, should be enough to synth both positive and negative Gs well enough to pull it all off, as well as to add what's needed to feel some heave ... with the motion rig providing pitch, roll, and yaw, and the VR's semi-motion sensation filling in the gaps. :)

 

my update for new 3DOF chair maybe finish before christmas lol .. then mounted on my old platform, I reduce the height

[MacThai_75]

^^^ Great Christmas gift to yourself!

Will be interested to read how it all works out!

[steve2112]

i wonder if i could use some kind of airbags attached to my existing seat. i'm not crazy about the idea of cutting my racing seat into bits, it looks so nice now

[MacThai_75]

If you can come up with a way to inflate and deflate them fast enough (like being at a Pink Floyd concert :smilewink:)IMHO it would actually be better than plates.

 

I have a special 2 axis (alt/az) computerized and motor driven chair (called the StarChair 3000) ... that a fellow in Australia makes, to carry a large set of Fujinon 25X150 battleship binoculars for astronomy use.

 

I took the DC powered pump from a blood pressure monitor to inflate/deflate a lumbar support air bag, which is used behind my head to maintain the same eye relief as I go from horizontal to vertical and my head sinks back into the headrest.

I press a button to inflate/deflate the bag so I don't have to strain my neck to keep the same distance from my eyes to the eyepieces of the binos.

 

Although the cannibalized BP pump does fill the lumbar support air bag fairly fast, I'm just not sure that it would be fast enough in a flight sim for anything but slow smooth maneuvers.

 

Here's some pics of that setup that explains this a bit better.

I'm not sure if they are of any direct help, but they might get the creative juices flowing.

Click on them for more detail

 

With my wife modeling it, pointing to zenith ...

 

The lumbar support air cushion used as a headrest ...

[steve2112]

that's cool. i could use hot water bottles for the chair activators, and for the pump, i guess a foot powered dinghy pump controlled with a worm driver motor

 

interesting idea?

[MacThai_75]

After further consideration, I think that air will be too slow and/or too complicated to implement, because it will need to be throttled effectively so it's inflation and deflation are both fast enough, and be properly proportional.

It will also be very noisy ... sounding all the world like an obscene phone call! ;)

 

So I am looking into much simpler to build designs, that can be slipped into my existing seat ... sort of like this, but be motor actuated instead of the hand lever, and used in both the seat back and seat bottom ...

 

 

 

 

 

 

To add to the G-seat belt motorized roller system, it will 'probably' require me to open up the upholstery of my seat back and fab a new seat back extension anyway.

And my seat's bottom is already open underneath ... so fairly easy to install a device like this up under there, pressing against the seat bottom support straps.

 

I'm also looking into proportional solenoid linear actuators that (if cheap enough) might make a good replacement for the required motor, and possibly even most of the above's internal components.

I.e. long threaded rod, and other parts ... as well as the motors and etc. that drive the seat belt tension rollers.

 

A "more than one way to skin a cat" sort of thing ... :)

Edited November 28, 2016 by MacThai_75

[steve2112]

now you've got me all interested in the idea. damn you macthai75!

 

i agree the airbag is a bad idea, a mechanical system with linear actuator seems fine, but all the linear actuators i've seen on ebay are too slow, 5-10mm/sec

[MacThai_75]

Yup me too ... but not so much because of speed as much as force and throw at a continuous duty cycle, and etc.

So cheap gear motors of the proper RPM and torque seems to be the best choice to move both the seat belt tensioning rollers and the seat back/bottom arcing plate lever (as per the drawing above) probably after installing bearings to act as rollers to keep it operating smooth, fast, and with a longer lifetime than just the rubbing parts as in the drawing.

IOW: the inverted squared off U shaped rod #52 in fig 5 and fig 2 will have bearings to act as rollers placed at the top of the inverted U.

That U will be made from two pieces of flat bar with a rod of 'all thread' through the holes in the upper tips, with the bearing rollers installed first ... if that makes sense.

 

In other news ... check the rotational mounting orientation of your u-joint.

I just put an inclinometer on mine and found it has more angular movement in one axis than the other, because of the way they are built.

In one axis it was almost 25º and in the other axis it was almost 30º.

So if you need more pitch than roll, then you might get that by simply rotating the U-joint 90º.

Edited November 28, 2016 by MacThai_75

[misoswan]

3dof motion platform +A-10 chair VR

 

update my VR platform

[MacThai_75]

@misoswan ... Looking good!

Very nice detail, and the open platform design looks really easy to live with! :)

 

Good work! :thumbup: