Showroom 2 DOf motion Sim on a Budget

Will do

ah ok, makes sense, Rock on!

and they look really cool too....

Hi all,
Here we go with stage 2
130 x 65 x 50 x 3mm Brackets $8.00 ea
100 x 100 x 3mm brackets a couple of bucks ea
12 volt motors from the wreckers $20.00 ea
Brass couplings from Jaycar $7.95 ea ( I thought was a bit steep for what it is)



Running total?? Don't really care now!!!!




Had to cut the bosses down on the motors so that the plate would sit flush when mounted.( One on the left has been modified)
Next was to drill a 20mm hole in the centre to accept the output shaft boss and housing.It worked out well as the hole was there already. I just had to make it larger.
After that, it was drilling the 3 mounting holes. That was a bit trickier as I had to match the existing PCD of the motor.

Below is the finished item.





After that it was time to mount the pot.
A bit of eyeball engineering was the go here.Firstly I had to make sure the pot would be centered directly above the output shaft. (This was easier said than done.) One 10mm hole in the bracket for the pot shaft and one small 3mm hole for the locating tab on the pot.

Once that was sorted out, it was time to drill the coupling out to accept the output shaft to the pot. I killed the first one .Found out I had to drill halfway down with a 8mm bit (motor side) and the other with a 6mm bit (pot side). Firstly I went all the way through with the 8mm bit. Once that was done it was time to cut the pot shaft down so it almost butts up the the output shaft( Measure twice cut was) Never a truer word has been spoken.I was very careful with this one.




When that was all done i had to weld the 2 brackets together, being careful with the positioning so all my measuring didn't go to waste.





Now it is time to mount it all together.Here is the finished product.After a day of intense thinking and engineering on the fly. Still haven't written down or drawn any plans yet.. It is all stuck in my head. That is only one side, I still have to do the other one yet but, that should be alot easier.




I tested the system with live for speed. It all works well. Next week will be figuring out the cam and connecting rod geometry.

Keep you posted

Regards Simon

good stuff man, well done

simple but very effective design great work so far.

Well, I got the cam connected to the motor yesterday. Took a bit of work sorting out the geometry.I had to shim the cam up with a washer to make sure it didn't rub on the backing plate. Welded it into position and away we go.After bending the cam so I would clear the pot I managed to get a length of 75 mm ( CTC ) so I should give me a throw of 150mm travel @ 180 degrees.



One thing I am concerned about it the positive and negative to the motors. If i connect the con rods with a piece of steel off the seat , would this in fact connect the + and - of both of the motors electrically? Do I need to isolate the motors from each other completely?

Any advise on this would be a great help.

N.B. I tested the 2 motors and discovered my power supply (17 amps @ 12 volts max) can not handle the amps needed to power both motors at the same time. Works fine when running 1 motor, it kept cutting out so, the next step will be to upgrade the power supply to approx 30amps

Keep you posted

Regards Simon

Hi All,
made some progress this weekend. I bought a new power supply to handle two motors maybe another one down the track. ( Ebay $40.00 delivered.) Found a good post on how to turn it into a power supply pretty easy.

www.daddyhobby.com/forum/showthread.php?t=77204


Got all the wiring cleaned up, put plugs in the wiring loom so, if any components fail, I can just unplug and replace them. Same goes for any upgrades I may want to do in the future. Also put in a 30A fuse.

Tested the system with Sim tools and Live for speed. IT WORKS!! I have gotten further than I ever thought I could, thanks to this forum. I would like to thank everyone for their knowledge and information.Next step is to start building the seat itself.



Keep you posted

Regards Simon

Good progress

However Lever arm looks a little thin, maybe its just the angle of the picture but i would prefer to see a nice thick piece of flat bar, So you Guarenteed it will NEVER bend.

The cam is 3mm thick zip plated steel. I am hoping t is strong enough too.If i get the COG correct , it shouldn't place a lot of stress on the cam.I am more concerned about my dodgy welding.

U can always fix it if it breaks. Great thing about DIY.

Excellent progress, i must get into mine...

Got chrissy holidays coming up soon so, I will get stuck into it . Looking at a seat slider set up for surge and sway axis. My brother in law has a out of commission bush basher car at his house so I will grab the front seat and CV joint from that.

Best of all .It's free!!!

CV joints have some twist in them as they are designed for it, so dont be surprised if the frame twists a bit. Meaning you may have to put a drag link in to hold it steady

I still haven't firmed up the structural side of things. I have had a lot of ideas in my head but, wont know until i put them into practice.I would say a fair few gussets will be required .I cant really do anything until I get my hands on a seat, which should be this weekend.Then I can start on the design and progress from there.

Alright, time to fab. I got my seat and CV joint today.Went to the wreckers instead (Got impatient, couldn't wait for brother in law) Got a pretty cool seat from a MX6 $75.00 for both.CV joint was already cut with a gas axe so that made getting it out of the car easier. Cool thing is , I also have the slide rails so, the seat is fully adjustable for the kids.I will be able to use the sliders in future for a surge axis. ( Work in Progress on that one)
Bought 18 mtrs of 50 x 25 x 1.6mm RHS. $60.00. More than I need but, I am sure I will find a use for it.



Firstly, had to work out the overall length .I worked on 1200mm long this gave a comfortable length for the pedals, width was based on the CTC distance of the seat rails (490mm). Next was the height of the steering wheel. Got to thank my wife for posing for me as I did laps around her with a tape measure, I just started with a rectangle and went from there.




Once I welded up the uprights for the steering wheel and gusseted it up, I bolted down the seat and away we go.




Next was the most distressing.Finding the center of gravity.I found an old piece of 25mm PVC pipe. Got the missus help again( Ballast)Sat the frame on the pipe and just kept rolling backwards and forwards until we found the balance point.Took us about a half hour.

Tomorrow will be mounting the CV to the frame and fabricating the base.Got a few ideas but, I think I will sleep on it and look at it with fresh eyes in the morning.


Keep you posted
Simon

looks good, getting there

Great work !!! Love watching these projects come together