MY own 2 dof diy

as your request,i order this bungee cords and i dont know what i will do next, like how i will put it on the rig...

Should i buy Gas struts?, wiol this can help me reduce backlash?


100n power, or need more than this?,Also i didnt found motorcycle steering dumper as H3 dofReality use to help smothness.

so should i buy this?

Hello guys, i got problem that one motor moving up and down (tracking) more accurate than other one, when i tried to fix the issue i add more ki (smc3) for the motor that moving less its tracking perfectly but i got too much backlash, too much shaking, i change rod angle but i couldn't fix it, so what i'm thinking on is to purchase the dampers as suggested by *DofReality*, so i know its make the movement less but it can reduce the backlash ,

so my idea is to increase the Kp and the PWmin while using the dampers so i can get perfect motion with less backlash.

So is my idea make sence or should i do somthing els?

I use
(2dof front motor, 100A drive controller, 300w motors 12v.)

I cant use back motor with shoulder mont long rods because of my small room.

Looking forward for any suggestion and if anyone use dampers and can help me with my idea , appreciate it

I forget, i will order this dampers but waiting for reply about my idea first.

Hey there, Motor tuning is not easy and I'm certainly no expert. In my case I have only a narrow window where they function well and I found that narrow band with trial and error.

As to your backlash?
Is it backlash?

Is there physical slack within the motor gearbox or is it over correction due to the motor tuning?

Really you need to tune the motors under load, I tend to sit on my rig while I tune. I start with tuning it so it responds well to a sine wave, I then switch to motion in order to dial it in corectly. Square waves and triangle waves I tend to ignore. You can never get it perfect, the idea is just to get it as close as you can.

Equally you might find within the pid you dont require the i, ther d or the s.
I can run my machine well enough only setting P, PWMmin, PWMmax & PWMrev.

One config that works for me on m y machine is:-
Fpid/5
Kp 150
Ki 0
Kd 0
KS 1

PWMmin 10
PWMmax 160
PWMrev 160

but another is:-
Fpid/1
Kp 120
Ki 0
Kd 1000
KS 6

PWMmin 30
PWMmax 180
PWMrev 170

(All machines are different, these exact setting may or may not work properly for you, you need to find your own).

I find that both settings work well enough but the second one isn't so exact as the pid tends to slightly over correct and potentially thats whats going on with yours, I dont know.

I tried using bungie cord on my machine early on & it may have smoothed out a bit of jitter but if that jitter comes from the motor tuning, more than likely it will still be there. If your issue is physical backlash then the bungie or the damper might help but it might be cheaper to try the bungie first as if it doesn't help you dont want to buy the dampers.

As I said, I'm no expert but if you have questions I'll help if I can.

Thanks a lot bro, yes i have backlash so because of that i'm thinking on dampers.

@noorbeast i got an idea from this tip from you, do you think if i weld long square pipe to under the pedals and attach the rods and motors there will move the seat strong and faster with lower smc3 setting? , because now i'm using these setting and i cant get the green line near the blue until i increase the power and make the seat more jerky



see the green line here and this is how it look wile moving



its loosing big amount of movement in game like shifting offroad line,

so my idea is to weld like this from under seat to below the pedals and attach the motor there so i can reduce weight in m0tor as i thought from the your quote



to this

so it can help me achive my goal?, make the green line react more accurate to the blue line?.

ok when i go back home i will do, i will set deadzone to 0 but i dont understand what you mean by set steps to 1? can you expline it please, thanks for your time and help

isn't steps usage only for only changing value faster?, so i think its dosen't matter to let it 1 or 100 right?

here is it

this with kd

this with ki but too much jerky

yes bro i tried even set kp to 150 with ki from 1 to 10 but still too jerky

Hi, can anyone please suggest where to change the motor position?, i want to change motor place because i couldnt achive good movment in smc3 , its hard to move slowly because of backlash, if i increase damper streanth backlash almost gone but movment to green line its bad.

i think the motor place and the shaft in middle is too close to each other so i think i need to move it far enough to get easy move.