2DOF Steel frame 24v motors

Hello all. First time poster here. Been a member quite some time and learned a lot on this forum. Thanks too all the people who contribute with codes, parts list and other usefull info. Because of this i got the motivation to try building a motion rig.

I have been collecting parts for around 9 months now yes, i try buy things cheap, but its mostly due to exspensive shipping fees.

I welded a frame together with 40x40 steel tube. With a scrap ballbearing mount i found. For now i go for 2dof, but initial thought was 3dof. I still have a motor in spare.

I have arduino, ibt2, 24v 250w 75rpm wheelchair motors, hall effect sensors and 24v power supplys.

Just wantet to share my project and would appriciate feedback and thoughts from others

looks like we have similar builds! except i went with wood. ive got the same motors and just got it moving today. they have plenty of TQ! even at 18.5v. Yours is looking good man!

Thanks, yes. I have been looking at your build recently. It looks great! I see you have mounted the motors in the middle. I was actully considering placeing the motors same as you, but went for the rear mount instead.

Happy to hear it works and have good tq. I am still waiting for powersupply before testing my rig.

Hi:
Nice beginning
just as a sugestion. Ballbearing mount should be the last part to be welded to frame.
It must be as close to CoG as possible, and you dont know were it si until complete structure is done.
In my projet i did a complete preassemble, 2nd look for CoG balancing with me sitting on it , and last, weld it in the right position.
Probably you have enough torque in your motors, but is not mi case and in this way you can reduce the needed torque.
BR

Hi! Thanks for the advice. I know what you mean, but due to not wanting to tear down my current sim rig and knowing this project will take a few weeks, I took a gamble Im sure i may regret my choise later. I also wanted to build it little bit adjustable due to other family members maybe wanting a try.

I plan on mounting a electric adjustable car seat and make the steering and monitor on aluminiumprofil, so it can be adjusted up-down or forward-backwards with some manuall work.

It could work or be a complete disaster, I will keep this thread updated

I’ll definitely be following your build to see how it runs!

Mounted some aluminiumprofil too have the steering wheel and maybe monitor on. Still need make the middle piece where the mounting is going to be. Hope i will manage to make it adjustable and still be rigid and solid.

Still not recived the power supply.

I am starting to think the ballbearing is not going to work due to the rotation it also give. Might need the sort of other link or u joint.

I used this one

Hello again! Sorry for not updating this thread, the truth is I have not made much progress befor yesterday, when i finally installed a proper joint link. Works good.

Problem now, I am thinking if the 24v wheelchair motor is grounded. Because when i run one motor straight from the transformer, I can measure 24v from motion rig frame to transformer.

Its a MY1016Z2 250w 24v 75rpm wheelchair motor.

Anyone testet this motors before?
Hoping for some clarity. Thanks!

The motor is unlikely to be grounded, I have the same motors only from a different manufacturer and they are not grounded, show in the photo exactly where you measure the current and it shows 24V.

I thought so too, but I checked for resistence between motor and frame it was. I then connected one motor just to confirm that its actully correct, and then i measured 24v from transformer and frame. See picturers. Sorry for bad quality.

I have since connected the motores to a bit of compressed plywood type of material, very strong, to avoid any problems with electricity to the motores

Great news. Its alive!

Waiting for the seat before i mount the steering wheel and pedals

Update:

After placeing the seat and had a sit in the rig with motion I think I need to redo some framework. The CoG is not centered on the joint and the motor mount and the arms(?) is to weak. I used a 8mm threaded rod from pivot to upper frame, this started to bend little bit. So need stronger connection there.

All in all a little setback, but I find the building and thinkering very fun.

Is there a way to limit/threshold the motor movement( how far the arm/piviots/ motor rotation move) in smc3?

It feels like the potmeters are not sensitiv enough. It might be due to 1:1 ratio. I think if i make the potmeter input 1:2 it will work better. I use rubber band and plastic roller between the potmeter and motorshaft

Potmeter and motor

All solutions I've seen used a timing belt, rubber band can slip.

1:1 ratio is OK , I have one and have no inaccuracies in reading the arm rotation .

Thanks! Yes it is a good idea. I have also seen it on some threads here, I will look into it

Update:

The third time looks too be the final time. I think its ready for steering and pedals now.

Have new joints between motors and frame, as well as sturdy motor mounts. Also put the electric on its own base as it was hard to change stuff with all the electrical in the lower frame.

Enjoy some pictures of the latest version.

I also took a run in smc3 and all works like a charm now. Rig feels very strong, as well as the motors.

Moved the the lever very close to the motor shaft center to not have to wild of a ride. I feel it is very good now, just enough movement