Bumpy Stepping Motion (2 Dof Flight Chair)

That is one solution. The phidget motors I bought have the planetary gear but they're brushless and I'm not getting into that. Good luck with the project.

I spent last night and today working out a potential solution that I hinted at before and have ordered parts. Due in a few weeks. I'll update when it comes together. Only spent about $120 including shipping (which was more than half the cost). Hope it works out.

very informative. i've reviewed the videos, and flew a bit slow - indeed i can feel the steps (on roll mainly). pitch seems to be fine.

I'm looking forward to seeing your solution as well. I'm at about twice that cost with mine. I hope both solutions work as we want them to.

Hi Tim, were you able to resolve the problem?
Thanks to let us know.

I found an interesting video, DOF Reality H3 user writes that after changing the software to SIMHUB he feels less “cogging”

Thanks a lot, I'll also give it a try by next week. Looks like things are moving fast for Simhub.

Hi Attyla, i tried Simhub. interesting software, but i didn't get any improvements over Flypt. i guess it might come down to case by case basis.

Here is the solution I've been working on!

https://www.youtube.com/shorts/BkG8xuLoC2Y

It's taken me a while to figure out how to piece all of this together and I had to find a machinist that could bore out the gears to fit the shafts, but I think this will work! I believe one of my motors is bad as it seems to be pulling too much current (pwm in smc3 shows maxed out during motion and it's shutting down psu during direction change at higher speeds) so I have a replacement on the way, but I'm getting closer. And that motion is butter smooth due to the significantly decreased "CTC" radius. The previous radius started at 55, then I tried 45. This new radius is 17.5'ish (35mm OD gear) so my available torque has significantly increased, my motion distance increased by about 10mm, and the efficiency is constant due to the linear travel. And the original problem of a lumpy ride at slow motor speeds appears to be gone. I haven't created the linkage between the rack and the chair yet, but it feels very smooth at slow speeds. The downside is the max speed of motion will decrease, but it will still be plenty, especially for flight. I've calculated it at 137mm/sec max. (Gear OD is 35mm, motor can run at 75rpm.)

Of course, to use this linear rail method, there needs to be enough vertical room above and below the motor for operation, but I already had my rig on top of a rolling platform so I can move it around in my office, so I have plenty of room. I'll check back when I get everything running (hopefully).

Thanks a lot Tim. The new setup looks promising. All the best.

Tim , see the code published on page 133 of the thread about SMC3, user Sebastian 2 published a revised SMC3 code with working Kd and Ki, the result is that the movement even on 24V 250W motors is much smoother especially with slow movements.
https://www.xsimulator.net/communit...or-driver-and-windows-utilities.4957/page-133
As for the motor drawing too much current, the cause may be too much grease that the manufacturer applied, I had such a case and replaced the grease with CX-80 lithium grease the motor works fine.

Reading through you entire I thread I have learned you are 1000x smarter than I will ever be, that being said. I have been spending countless hours dialing in smooth movement on my platform for helicopters. Pretty much GA with all the wobble in the world depending on airframe.

Going back to your post from Feb 25', you tried 100% smoothing, one thing I noticed with simtools "Filter smoothing" for super small inputs and movement... "smoothing" seems to add that stepping feeling, slower movements with more smoothing = less smoothness (for me) Maybe it's my platform, but what I found best for me was this combo. Pitch & Roll + Pitch Rate and Roll Rate as seen in my photos. The Pitch and Roll has a slow washout, and zero smoothing with the most "DEGREE" of movement, while the "RATES" added a quick response with minimal smoothing at 40%, but because their movement was 10% at most vs pitch rate and roll, with an added dead zone, the initial movement would line up with the aircrafts movement and then respond at once with the "rate" and fall into "degree" for pitch and roll. I then movement my intensity down from 100% to 50% and increased the sensitivity in the m/ax/min for those rates and degrees. The movement are seemingly one to one with what I see and feel to the sim. It's now smooth as all hell too. If this helps in anyway then I great. If this is useless to you then disregard and carry on. Good luck.

Thanks! I'm actually pretty sure I'm one of the below-average-intelligence people here as I unfortunately don't know enough about electronics. In fact, I'm having major issues with this new setup and just burned up both power supplies somehow. But that's for another help thread I need to start after I get done writing this.

Anyway, thanks for the idea. However, the smoothness problem lies outside of simtools and persists regardless of settings. I can recreate it in Flypt mover using a very slow and shallow sine wave, unlike the uncontrollable wave of SMC3. And it's logical too, these motors are not designed to move at 1 rpm, or even less, and only a degree or two, perhaps less, which is what the typical GA flight would consist of during straight and level. Fortunately, I think this new design will solve this as the motor is going to be spinning faster and further for those small, shallow movements.

Thanks so much. I read through the page and definitely saw some interesting things there. Once I get my other issues sorted out, if I'm still having problems, I'm going to come back and try the modded version of smc3 posted there. Looks very promising.