2DOF - Seat Shaker - Obutto Ozone

Hi Everyone! You guys are super inspiring, and I have begun planning my own project using ideas from many projects here.

My goal is to use my existing Obutto Ozone, and to create a compact 2DOF seat shaker setup similar to @pipis2015 'compact seat mover'. I plan to place it between the Obutto seat and frame like this.

I'm thinking of getting two of the "Canada Worm Drive Motors, 12V DC, 75-80RPM 50:1" motors that are mentioned in the 'DC motors shopping list' FAQ. From what I've read in the forums here, it sounds like I'll want the 50:1s since they'll be placed directly under the seat.

I've also read that setting up JRKs is much easier than setting up Arduinos for this, so I plan to buy two of those. I've got some basic experience with Arduinos from previous hobbies, but like the idea that the JRKs would be a bit more plug and play.

I do not have any tools for cutting metal or welding, so I'm planning a couple of workarounds that I've seen here. Rather than using steel plates like @pipis2015, I'm planning on using wood. I've seen a few other similar projects that mount the motors and the universal joint to wood, so I'm thinking this will work ok. As for the universal joint, I'm going to try to make my own like @Wanegain suggests in the need-u-joint-recommendations thread:

Any red flags you guys see? My plan next is to order the motors and JRKs and see if I can get them working. Then I'll start working on putting things together.

Thanks for all the information shared here!

Awesome, thanks for the confirmation @noorbeast! I've ordered those motors and the JRKs, as well as two 180 degree hall sensor pots (6127V1A180L.5FS) and two HP DPS-600PB B 575W power supplies.

I'll take pictures and post updates once I get my hands on this stuff. Can't wait!

Life got in the way and this project took a bit longer than planned. I was able to work on it slowly here and there and finally got it all together though. Here's the rig with the seat attached:


I did end up building my own u-joint, and it seems to be working well:


Here's how I've got the two motors mounted:


I ended up connecting the potentiometers to the motor shaft with tubing as I saw elsewhere in the forums. Seems to be working well:


Here is a closeup of the motor levers and rods connecting to the top platform:


I got it all wired up and had both the JRK configuration software and the xsimulator software moving the seat around and was overjoyed ...until I sat in it and broke both of the motors It was all going well for a short time until I shifted my weight in the seat and found myself flailing.

My theory is that I stripped the gears on both motors, as I am able to move the levers freely with no real resistance. My plan is to remove the motors, disconnect the gear boxes, and examine the gears inside to confirm. I'm hoping I can easily find replacement gears if that is indeed what happened.

I _may_ have shifted my seat backward on the rails while I was putting everything together, so the center of gravity might be off. That's my first thing to check as far as addressing any design flaws that may have contributed to the break.

Besides that, is there anything that sticks out as something to adjust? I'm hesitant about the length of the motor levers and the rods connecting the motor to the top platform. I wasn't completely sure that I was using the calculator correctly, so there could definitely be some adjustments that need to be made there. I'm also wondering if I should use some springs as I've seen on some people's rigs.