2 DOF Motion Sim

Hi all,

A little bit about myself: I am currently an undergraduate student studying computer and electrical engineering. I enjoy working with electronics and love playing video games so why not have the best of both and create a seat mover! I have very little knowledge and experience with hardware tools and components so this will definitely be a learning exercise for me.

Here I have obtained most of the parts. For this project, I will be going with Pololu JRKs and 25:1 motors, each driven by an HP DPS-600PB B PSU.



Starting off, I began cutting steel tube to use as the frame for the chair. In addition, I 3D printed tube connectors to use as temporary support for the frame to make sure that my measurements fit properly before taking it to a shop this weekend to get it welded together.

Hoping to make more progress, but I've been bogged down with school, work, and applying for jobs.

Hello, Welcome and what A WONDERFUL start to a very addictive process. Glad you have joined us and I am looking forward to seeing your build in detail wherever and whenever possible of course...

Not a lot of updates so far: did the wiring for the PSUs and verified that they output 12V.


I did run into an issue though, which I'm hoping someone may know the answer to. I took apart the DC motor out of curiosity and 2 pieces flew out.

I want to say they both go on top of the bearing but I am not sure why there is a need for 2 of them. If anyone has any insight on how they are put back, I would greatly appreciate it! Tomorrow I am looking to getting the seat frame welded together and mounting the seat.

They are normally there to take up the play and stop the armature from moving back and forth. I would have only ever pulled these apart if I had to .

SeatTIme is right.

They are definitely spring washers for armature play. Though looking at your photo, the reassembly is going to be somewhat tedious. My simple opinion is that you may have to take the whole motor apart to reassemble it all together correctly....

I met an awesome fellow this past weekend with a very impressive workshop who was able to help me weld the steel frame together.


With that completed, I was then able to get the seat mounted on top and onto the base platform.

I am liking how things are coming along so far and can't wait to see (and play with) the finished product!

Got the lever arms for the motor installed and mounted onto the base. I'm using 3/8" threaded rod for the shoulder mount rods shown below and am a little concerned if it will start to bend over time with usage. Would it be better to reinforce it somehow?

I feel like one of my JRKs may be out of luck I went to test them and can't remember exactly what I did but I smelt something burning. Now when I get to the "Detect motor direction" in the JRK Config Utility, it spits out an error saying "Error detecting motor direction. Driving the motor with a duty cycle of __ did not change the measured feedback. Check your motor and feedback connections."

At first I thought the motor was at fault so I plugged it in to the other JRK which worked fine. Upon taking apart the heatsink I saw this and don't know if there is anything that can be done or if a replacement is my only option.

I have a general idea of how I want the placement of the PSUs and JRKs to be placed. Also ordered some 80mm fans to help with cooling the JRKs. For now, I only have 1 motor controller wired up because I fried the other and have a replacement on order. Also inverted one of the 3D printed potentiometer mounts temporarily as it is not long enough.
Also a video demonstrating basic movement of my seat mover. I may consider shaving a bit off the levers as they seem to be coming in near contact with the rod ends.

Hey, your sim is amazing, and you work in a places very clean, it bring a good vibes to make all in a one day.
I am to making a 2dof, in the beggining I made test with xsim and woks but, there some problems, and I decided to use simtools. Now, I am sure tha the software, the pins conecction change and all the values, and the code for arduino(before I used prilad and sirnoname). If you have some inf about how start and what download i will appreciate it. Thank. Good Day

Man I found that maybe you can look for support.
https://www.xsimulator.net/simtools-quickstart/

Very small update before the big one (my replacement JRK is supposed to arrive today ). I have applied for a Simtools license and have some game plugins I would like to download but currently am short of coins.

I modified the pot mount to extend the length far enough to mount my potentiometers.

Also because my project is delayed because of a fried JRK, I'm slightly concerned if the thermal pad from the heatsinks are good enough for transferring heat. I will additionally be using fans so that should definitely help with cooling but I am wondering if going with thermal paste (Arctic Silver 5) is more effective than thermal pads?

Very late post but it's better late than never. I've been busy with school and other things so I never had a lot of time to work on the motion rig. But after 3 months since starting this project, I'm happy to announce that this project is pretty much complete!


The only major update that I've really made is mounting the shifter down to a more natural position on the rig.


As promised, here is a clip of me using the rig. I don't know if this is the end of this project or just the beginning of something big. I'm open to suggestions as to what I can do to enhance this!