Winging a 3DOF (pitch, roll, yaw) build.

I decided I'm going to cut my rods down to 19". After 45°'ing all angles (rest angle, rod angle, and pivot angles), I found the intersecting point right at 14" on seat back frame. It still gives me plenty of pitch (17°) while maintaining 99% efficiency, and roll at 71% efficiency. I'm going to keep a long CTC lever (5.3") unless someone tells me directly it's an absolute horrible idea. I'm still having issues wrapping my head around why a 2.5" CTC is the golden rule.

Thanks! Today I mounted yaw motor, made lever for that (2.5 CTC) and also made holes at 3 and 4 inches CTC on my pitch and roll motors. After cutting rods down and manually pitching the seat base, I'm still only getting 11.2 degrees max (so much for simcalc telling me I'd get 17°, lol). It's alright, I just want to get this thing wired up and into simtools testing stage. That'll hopefully be this Wednesday. Only thing holding me up is I gotta make the yaw rod. Maybe I'll knock that out tomorrow evening.

Mounted the 3 pots last night and made the last control rod. I cannot find a 3 motor diagram for Arduino and IBT2s. Can anyone helpe out with that please? Would the green from the third IBT2 go to 6, and the blue go to 7 of the Uno R3? This is the last thing holding me up from testing.

Sorry, forgot to add the diagram I'm working with. Would the correct config be green 6 (PWM) and blue 7?

Ah man. Yes I am planning on using smc3. I haven't seen any tutorials on using a second Arduino. Are they wired in series or do I need to get a separate USB cable for it? This is gonna set me back quite a ways timewise. Gotta do what I gotta do I guess.

So the 2nd Arduino arrives tomorrow, but I have yet to find how to wire the IBT2 for motor 3 to it. Would I wire the IBT2 into PWM pins 2, 3, and 9 of the second Arduino? Or to PWM 6, 7, and 11?

Also, did power on testing on Saturday. One of the IBT2s was bad. 3 more of those arriving tomorrow as well. But for the controllers that worked, they dialed in pretty quickly. As of right now, rig is stripped down for clean up and paint. I'ma post a lot more pictures after work today.

Just to be clear, the wiring position for motor 3 on the 2nd Arduino does not matter? I can wire it in same position as motor 1 on the first Arduino?

So the structure itself is 95%'ish finished. Gotta make TV mount and possibly a dual caster wheel drop for the rear. The electronics are half way finished, hopefully done by Friday night, with full motion in seat testing Saturday.

Quick question on setting the motor rest position. When power is applied to the motors, which software and where is the rest position set? I'm running SMC3, but when power is applied, they randomly set themselves. They are not running away or spinning, I'm just trying to get them to find their initial "set here" spot when turned on.

After searching "centering", a few threads popped up that I'm going to dive into. Centering was the term I needed. Thanks again for that.

Having a ridiculously hard time testing in SMC3. Pots are accurate, all centered, but when it comes time to motion test, it will only do 3 revolutions and then the motor cuts and the arm of the motor being tested just drops to max bottom. The sine wave is nowhere near close to clip or max. Only powering 1 motor at a time. This happens with all 3 motors. Watched multiple tuts, and no matter what I try, it keeps dropping out on me. Manually, I can move it with cursor without any issues. Any suggestions or should I just move into simtools?