6DOF motion platform using ODrive

Wickie,

Thanks!

Unfortunately though, none of the endstop commands are showing up for me.

I’m on Ubuntu and I downloaded the Wetmelon repository and tried flashing the board…
it does:
erasing… done
flashing… done
verifying…done
waiting for the device to reappear…

and then I get a bunch of errors.

But it appears as if the board got flashed… however none of the endstop commands are available.

I must be doeing something wrong…

AHH! I figured it out! I hadn’t downloaded the development tree properly! Its github’s fault. When you click on the “clone or download” button on this page: https://github.com/Wetmelon/ODrive/tree/Endstops
and if you get the link to clone “https://github.com/Wetmelon/ODrive.git” it is not the right branch.
but if you download the ZIP file it is correct from this page it is correct.
arrg so frustrating. @Wetmelon FYI

also @Wickie one important command missing from your table is homing speed:
odrv0.axis1.controller.config.homing_speed = 2000

hello together

I think it’s time for a little update on my project.
The last weeks I have continued a bit with the production of the parts. The production of several identical parts is much easier than it was with the prototype. Meanwhile more than half of the parts are finished -see picture.
This time I also produced the motor flanges as laser parts. They are super cheap and precise and only need a little rework. Very recommendable! I have also ordered some more parts, if somebody wants to rebuild my actuator…

Wickie

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Great job.
Now, put it all together :+1:

Hi Wickie, Yes great job.

I went down the path to laser parts here in AU, but way tooo expensive ( for me at least ) so I print on; until I’m really happy with the outcome.

Talk with you soon.
Jerry.

dear community!
again some update of my project:
The last Weeks I made more thoughts about the upper part of the platform and the base.

As you can see I changed the design of the base – It was due to a proposal of my son - and what shall I say - we love it!

For the material of the base I decided to make it from reinforced concrete. The reason for this material is because I wanted to have a stable and heavy base and minimum of vibration noise coming from the actuators.
And last but not least - I think it will look super cool (at least in my opinion :slight_smile: ).

So we started to make a mould from wood and purchased cheap concrete for about 15,- € (for 90kg) - as it turned out it was too cheap !!! so during demoulding our base cracked. I also think we have been too unpatient and didnt wait long enough for hardening.
So we decided to build a new mold - and due to the lessons we learned so far, the second mold became much better than the first one.
Also this time the concrete we used was an expensive and special one that is usually used for making concrete furniture. The price was now 117,- (for 75kg). But believe me, it was worth all the money!

Now the base is finished and we are super happy :slight_smile:

The weight of the base including the reinforcement is now about 80kg – so possible to carry with two or three persons.

Here are the pictures…

regards

Wickie

2 Likes

Amazing work. Let me know if it’s available for purchase.
Thank you.

Hello all!

Last week I received my high-speed quality ball screws from TBI Motion!
And they look sooooo good :smiley:



The shop where I bought the ballscrews is called Tuli ( [[https://www.tuli-shop.com/linear-mo...d-nuts/precision-ball-nuts/ball-nuts-sfh.html]
Bildschirmfoto%20von%202019-10-04%2021-34-06
After the first attempt with cheap China ballscrews (which I had exchanged again because of the running noise), I finally decided for the 10 times (!!) more expensive quality ballscrews - hope they are worth their money and run quietly.

Since all parts of my actuators are almost finished, I think the final assembly of the actuators can be done in the next weeks! I am sooooo corious.

Wickie

2 Likes

Hi Wickie,

I’m new to the ODrive site and am loving your project.

Can’t wait to see it fully operational.

Well done for all the hard work.

Regards,

Neil.

Hi guys
some little update on my project. Yesterday I finished the last parts of all my 6 actuators - really all! - I can tell you guys - it was a lot, lot of work! - I think it have been alone more than 200 threads to cut!
Today I gave the Zylinders some paint (same color than the later rubber-cover - RAL 7039).
Wickie

4 Likes

Really awesome work you have.

Since you’re having issues with usb, have you tried using ethernet-serial bridges? They use erhernet-serial bridges and virtual Com ports on your pc.?

They’re really handy when you need to use multiple serial devices. Or use serial over long distance.

Hello Roiki1,
nice that you like my work!
Regarding the ethernet-serial bridges I have to admit, that I am a total rookie in software and electronic things. My focus was allways on the mechanical side.
But nevertheless thank you very much for the hint! I have looked a Youtube video about the ethernet and tried to understand. Maybe it will work.
When my motion-platform is running I will go back to the software topics and I would highly appreciate it when you could help me in case I will have problems wit the usb communication!
warm regards
Wickie

Hi all,
some update to my project:
This week, my son an me started the final assembly of the actuators. And I can tell you its such a good feeling to see the work growing and to see an end of the long tunnel :grinning:
Today we also built a simple wooden upper frame, just to be able to fix the 6 actuators provisional on the base and see the first time the overall dimensons- I can tell you guys, the simulator is really really huge and looks somehow dominant in my living-room - (luckily I am already divorced - otherwise I would probably still have that in front of me now :rofl: ).
Wickie



3 Likes

Hi

I’m lucky that my parents are divorced, now line is standing in my dad’s living room :joy:. Yours is coming along nice too. Good luck

Cheers

Carelsbergh Stijn

Hi there Wickie, you have produced something fantastic, to make this a reality; keep up the good work so we can all enjoy your build.

Regards Jerry :smile:

PS: how are the ball screws ?

Hi Jerry!
Regarding the ball screws: When looking to the surface of the screw rod with help of a magnifier I can see it has a very smooth surface compared to the chinese -ball screws I had. Also they run smother when turning by hand.
But to rate the noise under real racing/ sim conditions I still have to finish the electronic-box and install the hall-sensors (edit: sorry - meant Reed endstops)
I will report the results
warm regards Wickie

Out of interest, why do you need Hall sensors when you have encoders fitted?
Nice project, btw :smiley:

Hi Towen, I may be wrong, “as I often am” but I think Wickie may mean “position” sensors for safety as the encoder is not absolute.

Jerry :slightly_smiling_face:

Hi towen,
Jerry is right - I meant the magnetic Reed-Switches I use for the endstop detection :grinning:

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