High angle & Displacement 6DOF

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Re: High angle & Displacement 6DOF

Postby DoctorD » Sat 1. Nov 2014, 13:39

Well, tonight I experienced a certain little sense of accomplishment and pride as I sat back and took in the machine.


I still have a few things to complete before I can run the full test routine, but it certainly moves well using the positioning sliders individually.
I can get 38 degrees of pitch and roll (looks scary) and a tad under 500mm of translation in all directions.

The max speed is limited to 30% for now, but it's certainly no slouch!
I'm wondering whether I'll get the nerve to run it anything faster than 75% from first impressions.

A few more bolts to go in tomorrow morning and I'll get out the camera for some recordings.
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Re: High angle & Displacement 6DOF

Postby RacingMat » Sat 1. Nov 2014, 19:12

DoctorD wrote:Well, tonight I experienced a certain little sense of accomplishment and pride

Yes, you can! 8-)

DoctorD wrote:I can get 38 degrees of pitch and roll (looks scary)

A video !! but don't forget your belt!!
2 DOF playseat : arduino, motomonster, 12V truck wiper motors
http://www.x-sim.de/forum/viewtopic.php?f=37&t=943
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Re: High angle & Displacement 6DOF

Postby DoctorD » Sun 2. Nov 2014, 07:43

No videos yet, but here are some shots of the platform going through some basic motions.
As you can see, there is plenty of range left on the actuators to mix in other motions (so you can still have bumps and sway whilst at full pitch/roll).



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Re: High angle & Displacement 6DOF

Postby vicpopo » Sun 2. Nov 2014, 09:48

Hi DoctorD,

That is an awesome pitch angle !! :shock:

Really interested for now the first video in motion !

Looks very good ! ;)
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Re: High angle & Displacement 6DOF

Postby sirnoname » Sun 2. Nov 2014, 12:49

Will you mount the couch or the chair ;)
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Re: High angle & Displacement 6DOF

Postby Riton » Sun 2. Nov 2014, 14:05

cool!!
video now! 8-)
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Re: High angle & Displacement 6DOF

Postby tronicgr » Sun 2. Nov 2014, 21:46

sirnoname wrote:Will you mount the couch or the chair ;)



I think he can!! :lol:
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Re: High angle & Displacement 6DOF

Postby dillydally » Wed 5. Nov 2014, 06:06

DoctorD wrote:6x 2Hp 3-Phase motors - Brand new surplus stock from eBay ($80 each)
Motors.jpg



Those huge motors for only $80 daaaamnnnn what a deal.

Also just want to say how awesome this sim looks, you could charge people to ride it at a fair. hehe. And for $6000 total you have done an amazing job at sourcing parts at good prices. Do you think it will come in on budget?
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Re: High angle & Displacement 6DOF

Postby DoctorD » Fri 7. Nov 2014, 05:34

Thanks for the lovely comments Dillydally :)

I'm pretty sure I went over the 6k mark last fortnight (currently at 6300 total expenses). I am very happy with how well it has gone together and also how neat/clean it looks when assembled.

Which reminds me. There are only 3 of those motors left, so I better pick up a spare or two for replacements/upgrades (should I add that to the build cost?... probably yes :P )
I'd love to add a 7th axis at some point (continuous yaw).

Videos should be inbound this weekend. I've spent a crazy amount of time working on the control rods. I didn't trust msyelf to weld them sufficiently well enough (considering the relatively small contact ring between the rod and the tube) so I've gone to a more 'composite' approach, a combination of high-roughness/high-surface-contact JB Weld (epoxy) coupled with multiple high strength dowels which I calculate will give me at least 5400N (540kg) of longitudinal resistance in shear per control rod. I have allowed for a factor of safety of 10 to allow for the dynamic nature of the platform and the variability of the epoxy adhesion forces, creep, vibration and the fact that someone has to sit on it :P (that's over 5 tonnes, when unfactored, per rod).

I guess patience and time will tell (coupled with a healthy maintenance and inspection regime)
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Re: High angle & Displacement 6DOF

Postby DoctorD » Sat 8. Nov 2014, 07:51

Alrighty, I finally have some decent video to show you guys.
This is a simple clip, motion is controlled via the X-Sim plugin axis sliders (moved by me using the mouse).
I still haven't gotten around to tuning the servos and all 6 motors are running off the same wall socket (not the best practice, I know). Soon I will have them split out into 3 different sockets so you won't see voltage error pauses, like when the platform drops at the front in the heave motion in the clip.

The translational movements are a little 'ugly' at the moment because the platform geometry isn't in sync with the software plugin. Additionally, The yaw movement is only set to around 50% of it's total travel.
Max motor speed set to 83%.

Anyways, here's the video:
http://www.youtube.com/watch?v=AMBpimru3Nk


Hope to have more in the coming days...
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