My 3DOF project is born!

What I mean about the harshened profiles is, that you can increase the intensity of the motion as you have more power available to you.
As for the heatsinks on the big chip of the jrk, put a cooling fan on it. Thats why I set up a box like I did. The jrk's stay nice and cool.

Hi
Youre mechanical noise sounds like ,wrong distance between gears.
do you have much backlash?
i admire youre great work
regards Ad

winch motors are noisy going in one direction, let alone constant direction change.

Sorry for giving sereous advice!

I think you could weld a case around the winch gearbox and fill it with bearing grease that should atleast half the noise, this is much the same principle of my wheelchair motors.

Hi dudes! Thank you all for your comments and advices!

@adgun: Hi! the distance between the gears of the winch isn't editable since you don't want to loose the really good actual situation of forces. Winches are born to transform and amplify the force of the poor 12v little motor on it!
What you mean for backlash? in the gear motion? If yes so winches have a pretty bad backlash because the work of the gears. If you want all that power so you need to know that you have to consider dead zone, limits and do a lot of correction in the profile.
And please don't hesitate to give me serious or less serious adv ices!, I need it!

@bsft: Dude I am working on the box where I will put the 3 jrks I need a lot of cold for these little monsters!
about the new ranges of movements so yes, I am changing the old profile for the new earned degrees of inclination
Now without changing the old profile so I already earned a lot of centimeters! But with the new modifies to the profile then I will earn again other centimeters of inclinations! (damn, sorry for my english..)

@BartS: Yea dude, I was thinking about the same! To build 3 little soundproof room where the motors will stay! I am pretty sure I will reduce about 20-30% of loud! The only problem could be that the motor temperature will can get up.... :\ just I need to test it

for people who dont care about backlash www.banebots.com
for gearboxes with motors that ,out performs scn5/6with force and speed.
regards

there are a lot of interesting components there!

Hi all again.
Today I made many stress test of my 3dof. here the vids!:





Here the vid with complete cabin



The work of the end-join with the new modification.



With cabin without the hatch


Here the problems after all these tests.

A lot of test and some considerations:
1) the stern winch some times get over it's maximum up position because the left and right winches when are pulling down make the stern winch forced to go up over the max up position. This is a problem that I have from the start and now I must solve that.
I will to add work range for the stern winch to have a maximum up position more up.

2) the 220v to 12v converter can't erogate the right amps. It's handle max 20Amps but the jrk is setted to 22.5. Result after 5 or 6 test : a bzzz sound and the stern winch motor getting mad up and down. I am pretty sure the problem is the 220vto12v converter. SO I need to change it to a powerful one. (left and right winch motors are plug to car batteries so no problems)

3) Jrk are not optoisolated (I hope this is the right english word) then many times happen they lost usb connection. I hate that, I need to buy 3 usb devices that make my 3 jrk will be optoisolated

4) My winches have one way friction, well narrow but with my actual configuration (many speed and power) they are innacurate when they reach and mantain a precise position. A lot of times happen I need to manually correct the position (very boring situation, loosen the bolts, Unscrew the clutch with the right tools, put a support to make the platform don't fall down to the Unscrewed winch, restart with the learn procedure, re screw all ecc ecc...).

5) My main under spring is too hard. My platform tell me THANK YOU if I put inside some BIG friend because more wheight so more easly my platform can go down with vertical force.
My motions system makes it harder to go down than raise.. this is wrong.. the spring is too hard to my configuration. If I try to obtain my 3 winches both down to minimum position I get my platform suffering very bad. And this is BAD.

So good to see your platform fly! Gives me hope for mine ;D
Thank you for posting your progress and sharing your learnings. Very valuable, indeed!
PS: I really like your signature…

Hi mate! Are you trying to build 3dof with winches + jrk? If yes so good luck, the way is not simple or easy but sure is possible :thbup:
If I watch the road traveled since now I am amazed from all the work done. Let me to give you an advice:
Please, make a good project before you start to build... it's very important.. I had a not precise project and I had to do a lot of modifications to the already assembled platform.. The haste and the money can be 2 really bad enemies. So a good start project (including ALL ***ALL*** mechanical aspects..) will your best ally for your project

Thanks for compliment and yea, If you decide to start then no hesitation and no fear!! Just GO go and goo!! and sure you will get somethings good! :

Hi guys, here some little news about my 3dof:

The new spring is near to arrive and a really new and big new configuration is almost ready!!

The new version points:

* New modification to the main squared piston. Added so and so 15cm of lenght. So the new vertical run will be: 30cm (finally I will feel (how I would) the up and down movement !! damn!!) (the old and actual cylinder already let me to have a more long piston)
* new modifications to the universal joint so the new lateral and longitudinal tilt : over 35°
* New custom and really over my limits optimized spring. This spring is obtained from a long calculations time about wheights, platform inclination and positions (price of this custom spring = 180€).
* now the 3 jrk are inside a box, with cable laying , heatsinks and 2 good fans.
* The new mechanical configuration let the motor to suffer less and the new spring is designed to be rigid of the percentage that my platform need to make my motors suffer in equal way if the platform going up and if the platform going down. Really many calculations here to obtain this (theoretical for now) result.

a few more days here and I will can to reassemble everything and I will know if all this work will go to an happy ending!!
Then soon I will post new vids! :hi:

Very nice project !

Have you thought about using a belt or harness ? It helps a lot when you have fast movements like yours, especially when braking or in corners...

Hi,

Just after a bit of advice.
Im copying your design. I have organied a Uni Joint like you suggested.

My idea was to create the uni joint and hte poll with suspension first.

Then once that is made, I was going to make a base that will be connected the top of the uni joint that eventually the seat and rest of gear will sit on...

I was planning on putting a bar in the middle to go horizontally down. This way I can move the joint back or forward depending of hte center of gravity.

After these were done I was going to buy the motors and worry abotu how I was going to attach them.

Then finally connect up the electronics.

I am lucky enough that my old man owns a workshop with lots of welders etc, but Unforutne that I never learnt how to weld so im relying on friends

If at all possible, I would love some Hi-Res pictures of the spring and stand

Thank you! Yes, the seat belt is near to arrive here too! (4 attach point, 75€). And yes, the movement effects get a very good improve with something attaching you to the seat! (I am already test with a DIY seat belt and the result it's great!

Mmm interesting. Can you show me some pics or paint about?

Yea dude, when I will get phisically the new spring and I will go to remount all so I will post some pics and video!
I am really excited to test this new spring.
A lot of destroyed brain neurons here but if all will go how I think (and I hope..), the result should be good!
:??

Hi Aldoz,

What did you use for the Ram that goes up and down? (Thats connected to the uni joint)

I aswsume you used a suspension strut. I just went and got one also.. I hope its long enough..

Hi stowaway, I am using a customized spring as I write before!. It's a 550mm lenght spring. The info about this spring for you are unnecessary 'cause my spring is done for exactly my motion system.
The spring is mounted in a squared cylinder-piston (with 30cm of possible run)

I will mount the spring with already this spring compress of 400N (to obtain correct performances and to give to motors the right and precise bit of extra lift power when the platform is at max position then in the moment in where the spring help is minimal so the gravity push with near his max force!)
The matter is really fascinating and It's really interesting to try to find optimal configuration to obtain maximal result!!

I probably wont get the most opitmal spring possible...

I was more interested in the Cylinder-Piston.. Where did you get that from? Is it from a car?

I went out and bought a Falcon Suspension

Kind of like this:

http://www.ebay.com.au/itm/Ford-Bilstei ... 20c2571d5c

Except mine has a spring on it, The spring is EXTREMELY tightly wound (meant for a car thats 1ton+) So what I am doing is i am going to cut the suspension so it is not so tight, and hopefuly it will give it a bit of play.

I dont think my piston wil have as much up and down movement as yours.. But It should be enough hopefully. It will definetly cushion the movements..

IF i need to get a custom spring, I will add this on later.