My 4dof scrapyard build.

Hello everybody!I have already started my build and read many posts from this awesome site.
I was also on a tight budget,so where did I look for my parts?Our local junkyard!The costs for my build,motors ,metal,gas strut,seat and the electronics is about just under 200 dollars.It will be a 4dof rig.
I have 4 motors, specs are:

• 1 pair are 24v 200w from a wheel chair cost about 5 dollars.
• 1 pair are 24v 400w from an old floor polisher 9 dollars.

• Gas strut found laying round for heave.
• A old office chair.
• Scrap metal for frame
• Electronics bought from china.
• For power supply two 12v 85ah batteries from junk yard.

I have been building my rig as I found part by part.
Here are some pics as I went along.

Video coming soon of testing phase.

Everything for just 200$? Wow, this is impressive. I am looking forward to see this in action.

Incredible I have done it in wood, with 2 scrapping engines and it has also left me almost 300 , only 2 dof(with the seat clear) I want to see those engines operating so cheap, I hope it goes well.
forgive use google translator.

Yep hoping it goes well

It seems i found a goldmine at our local junk yard,just hope all the parts hold up.

Guys just a small update,been busy with other projects around the house thats taken up my time.Firstly changed my rear motors to gate motors with their gear boxes to see if it will handle my weight better than the wheel chair motors,also they are plenty and cheap,about 3 dollars each at the scrapyard.Then I have decided to modify my frame as I felt it was to high.So I cut my rod arms down,also read a thread on calculating where to place my motors from the pivot point inorder to get a higher angle degree.So i decreased the width and length of my frame.Also worked out the centre of gravity using racemat suggestions.But now i have created a dilema whereby the front legs of my seat is the gravity center but if i place the front legs of my seat on the pivot the seat will now hang way over my rear motors..Will this not put too much strain on the rear motors?Will post pics of this dilema and the new setup.

Okay I have some pics of what has been done so far.These are my 12v 180 watt gate motors I am testing to see if they will be up to the job,as you can see from the pics how I connected my pots also,using a wrench socket that I had drilled and tapped for a hex screw.Don't know what is the gear ratio on these,but has good holding power and has good speed.Also have connected my motor drivers,using two Monster Motor Shields and two bts7960's.Have moddified a atx power supply to fit them in and is cooled by the default fans on the cases and have also added a larger fan to each case.Excuse the spaghetti wiring.

3 euros each engine? How cheap, it cost me 25 euros each in the design, congratulations.

Thanks,planning on making the hall sensor setup,this is just for testing though.Already broke a pot or two

Yep they weren't in the best of condition,had to redo brushes and refurbish them,always on the lookout for motors to rebuild,for instance I already found 6 3phase 1hp motors for my 6dof future sim all for 86 dollars paid for them by weight 1,43 dollars per kg

Okay here are pictures for someone to perhaps have a look for any ideas to assist me....

This seat has the centre of gravity by the red arrow.


The pivot point where im going to place the front legs of the seat.


The red square is how the seat will sit on the frame,as you can see it will be protruding over....will this cause the frame to be unbalanced or have too much starin on the back motors?Any help please...

Oh and here are more pics of the front of my gate motors if anyone wants a look.

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Can't see the pictures.

Dont know where I went wrong with posting the pics,I can see it on my side,I've re-posted them again.Thanks.

Yep I followed that example thats how I came up with the seat the way it is.Im going to try and just fit the seat over the frame and hope its okay,fingers crossed.Thanks

Okay the journey continues..
Had all 4 motors connected,pots set,just testing all 4 motors to work together in simtools.First tested without the frame,tested heave,pitch,roll,surge,sway and traction loss,everything worked without problems.Then connected frame to the motors and thats when all the problems started,the back motors which are the gate motors, first started glitching stuttering and eventually just getting stuck during movements,motor controllers almost burning out.So I figured it was something to do with my frame structure,1st thing I changed,the angle of my rods were not perpendicular,when I changed this ,could notice alot of the tension the motors were experiencing was gone.Then during movements the frame would pick up on one end,stupid reason,I had not welded the pivot stand to the base frame,once this was done the lifting stoppedI also decided to change the gate motors, felt they also weren't strong enough,so was running out of spare motors laying around because I had first started with two wheel chair motors,then the gate motors.Now I had two 240 watt 24v motors also from an old hospital polisher,but the gear boxes were way to weak,so I took the gearheads off and put the motors onto the gate motors gearboxes.