Uni joints

I'm building a 2dof joyrider and to move the pitch and roll axis of the platform I wanted to use some rods that would be connected to the DC motors. So, what sort of uni joints would you guys suggest in this case?

I think he means the uni joint for the pivot under the center of gravity below the seat. I'm in the same situation where I need a larger uni joint for mine to eliminate some of the rotational flex.

Yes, my mistake. I missed the joyrider bit. I need to go and talk to my 4x4 friends

I think you are talking about these guys. Not a universal joint, but a rod end. This is the one I used, which is a "QSC CFR-6, 3/8 X 3/8-24 Economy Female RH Rod End" on Amazon for $6.14 each with free shipping. Note that I mated these up with 3/8" threaded rod going from my levers to the frame, BUT the rod ends have 24 thread per inch so this is NOT the standard threaded rod from most hardware stores. I had to special order it.

One thing I didn't like was how little misalignment these allow. The ball portion just can't move enough before binding. This is a non-issue with the roll axis, but the pitch access would bind if the sim was rolling at the same time. That forced me to reduce my range of motion more than I wanted to.

The Rod end or Rose Joint's i suggest (What Noorbeast posted above) have a Chunk more "Working angle" , when you look at the spec sheets on SQ10-RS units you can see the angle that regular rod ends just cant do.

Working angle is a good term for it, and I may end up swapping my rod ends for these. I've also considered using actual U joints to allow a very big range of motion.

One other solution I considered very seriously was to have my pitch motor mounted to the roll frame instead of static on the floor. But my motors are awfully heavy and the force on the motor would require some pretty substantial structural elements to keep it solid. But now that it is done, I'm thinking having the motor roll would have been a better solution. That would completely eliminate the binding issues and the need for a rod end at all. That would have allowed me a greater range of motion.

@cgodwin I don't know if your aware that it is possible to extend the working range of a rose joint by using conical washers or some of the other methods listed in this post... https://www.xsimulator.net/community/faq/heim-rose-joint-conical-spacers.72/

I'm using SQ10-RS on my rods for the back of my seat.

Hey, thanks for the advice everyone. I did indeed mean the rod ends and not the uni joints. I probably will go with cgodwin's design because I know it should work. I guess it will be another week before I start completing this project.