Showroom FlyPT - 6DOF Brushless DIY Actuators

good job......

Thanks,

Well, the motors are rated 3500rpm and 0,6Nm (4500 rpm 1,8Nm peak)
For a SFU1605 (ball screw), thats 16mm diameter with 5mm travel on each turn we can have for rated values:
3500rpm => 290mm/s of travel
0,6Nm => 372N = 38Kg of lift <<<< WRONG! Used the diameter instead of radius.
0,6Nm => 754N = 75Kg of lift

Well this theoretically, still have to test it.
I need some weights for 75kg...

All printed parts are solid PETG. They seem to be strong, let's hope they are.

You are right!
Already destroyed two pots.
I think I will get some from VICHAY seems they are better.
I will try to add a bearing on the shaft. But she has to be small, let's see what happens.

Hi @pmvcda
first thank you for sharing your very nice and neat job and
could it be possible to use AC servomotors and drive like "1000W Leadshine Servo Drive EL5-D1000 and AC Servo Motor EL5-M1000-1-32"
with the same code and configurations?
cheers

Thanks,
Sorry for late reply.
I don't know much (or nothing) about those drives, I think they can handle pid, so it would be better to use pid in those drives.
If that's the case, I don't see much use for my code. You just have to send the pretended position to the drive (with the Arduino).
Don't take my word for granted, but having that feature in the drive is way better than making it on the Arduino.

Meanwhile, I got some connectors to connect the actuators to my control box:







I will add them to the parts list.

Also made some models with the final actuator design in Sketchup.
Here's an exploded view (just for fun):

Got some scraps of wood and made a prototype box this weekend.
It will hold the power supply, motor drivers, Arduino and all the connectors (to actuators, USB and 220V).

Needed to make it to study the way to put all the wiring, before making the final design and ordering materials (it will be made in aluminium I think).
Still missing some connections...











Even if it's not terminated, I already have some changes to make on the final design...

(If needed, there will be space for two more power supplies and it's still missing some fans over the drivers)

No big updates here.
Needed some days to print all parts, now some soldering needed on the wires to end all actuators.
My main problem is to decide the final sizes of the rig.
For that I made a Sketchup model with MSPhysics.
Still in doubt here.
I have 100cm longest distance between actuators and 20cm short distance.
Base and top structure share dimensions.
But how to put the seat there?
Certainly at the middle, but vertically, I wanted to put it in the lower possible position and use one of the horizontal beams to support the wheel.
I will make a new version of the model with the seat (still looking for a light one).



This model is available for download here: https://3dwarehouse.sketchup.com/mo...e-9848-3d665d1d7711/6DOF-Motion-Sim-version-2

Having the bottom ring larger than top ring adds lateral movements. Just a suggestion.

More "range"?
Need to take a look, but it would have more support and be more stable, the problem is space. I'm almost on the limit.
Would have to increase the length of the actuator to avoid low angles on the lower position.
This size in my opinion is the minimum to mount the seat on the top structure, so the only way is to increase the base.

I might be wrong but if they are the same size it more like 3dof. If the bottom ring is larger diameter then you get lateral movement as well as tilt.

Great work! Congratulations!
I tried to use axial bearings instead of the original BK12 or FK12 bearings for the ballscrew with no luck, now I was thinking about flange bearing and I just realized that you used them, any problem with them?
Flanges are just about 5 times cheaper than BK12 or FK12 in my country.

@ mariano86 inside the bk12 and fk12 sits a double row angular contact bearing and a deep grove bearing.
The double row bearing got two numbers 3201 and 5201 they are made for axial and radial forces.
Look in youre country with 3201 bearing and 5201 bearing, hope this saves money!
ps
only the number means an open bearing
ZZ after the number means with dust covers
RS after the number means with oil seals

Well, ideally you should use other bearings, but I think for the loads in this case, it's enough.
They might have a shorter life, but they are also cheap. Will tell in the future if they handle.
They use deep grove bearings in this, so they should accept the axial load. The bearing can pivot in the die cast, so any small misalignment is accepted increasing the bearing life.
My main concern is the die cast, will it handle the loads... Let's see.

A good supported ballscrew needs minimal one double row angular contact bearing, or two deep grove bearings on booth ends

Looks like a nice build, have you considered selling printed parts to fund your build?

Yes, I thought about that, and I think I have to make it, because cost's are increasing...

So, after looking everywhere, I got the courage and ordered this seat for my build:


(not my picture)

Problem, it takes between 3 and 4 weeks.
But it fits most of my needs:

-I can mount the seat in my real car
-I like the looks
-It's lite, around 5 Kg
-Ordered the padding to make it more comfortable
-It's solid
-Since it's composite, and an hard surface, it transmits better all the small movements and future installation of buttkickers.
-And the price is good! 280€ + 80€ shipment to Portugal.

This is going to delay my upper structure even more, I had doubt's and now, I really need the seat to be here.

EDIT:
For reference, they are the VX220 seats from JKComposites: http://www.jkcomposites.com/vx-220/
But in the mail,, instead of 300£ they make 250£.

The SketchUp model you uploaded is very much appreciated. I was in the process of creating a crude 6DOF model to animate from within Unity 3D (to scale for VR), but will now convert your model for the purpose. I'd like to visualise the extents of all 6 DOF allowable by playing with the dimensions of the top and bottoms frames and actuator lengths.

That's a beautiful seat. Very much lighter than my Playseat.

that seat is insane, i have stocking in the internet those ones, they looks just grate! nice decision

Great project!

I tried the sketchup model you made. It seems it needs larger base diameter. It actually broke when i applied full yaw rotation...

It seems that MSPhysics can't handle the 6 actuators at the same time.
I will try to change friction and other parameters to see if I can make it work better.