Bumpy Stepping Motion (2 Dof Flight Chair)

Tim Herschbach · Feb 26, 2025

Thick8 said: ↑

Hi, Sorry to be late to the party.
I'm having the same issue with a DOF Reality P3 machine. From what I've be able to gather, the problem is a combination of 2 issues that tend to present while slow flying. The founder of DR had a conversation with mark from Flight Sim Hanger regarding this issue, and their fix for it. Basically they are using the 3000 RPM motor in combination with a planetary gearbox and a ballscrew. This is supposed to eliminate both the backlash (position searching) and the issues with the 2 pole PMDC motor (cogging). Their new machines have this configuration, and they are supposed to be coming out with an upgrade kit for older units. I emailed them, and they wanted $520 +++ for just the ballscrew update. Can't imagine what the entire upgrade would cost. I've chosen to build my own upgrade kit. Here's a link to my progress. https://www.xsimulator.net/community/threads/sort-of-diy.19294/ I had to wait for a longer end-mill (that arrived today) to make cuts in the ballscrew mount. I hope to have at least one of them done in the next week or two. Here's the interview
Click to expand...

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.

Jango · Feb 26, 2025

Thick8 said: ↑

Hi, Sorry to be late to the party.
I'm having the same issue with a DOF Reality P3 machine. From what I've be able to gather, the problem is a combination of 2 issues that tend to present while slow flying. The founder of DR had a conversation with mark from Flight Sim Hanger regarding this issue, and their fix for it. Basically they are using the 3000 RPM motor in combination with a planetary gearbox and a ballscrew. This is supposed to eliminate both the backlash (position searching) and the issues with the 2 pole PMDC motor (cogging). Their new machines have this configuration, and they are supposed to be coming out with an upgrade kit for older units. I emailed them, and they wanted $520 +++ for just the ballscrew update. Can't imagine what the entire upgrade would cost. I've chosen to build my own upgrade kit. Here's a link to my progress. https://www.xsimulator.net/community/threads/sort-of-diy.19294/ I had to wait for a longer end-mill (that arrived today) to make cuts in the ballscrew mount. I hope to have at least one of them done in the next week or two. Here's the interview
Click to expand...

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.

Thick8 · Feb 27, 2025

Tim Herschbach said: ↑

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.
Click to expand...

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.

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Bumpy Stepping Motion (2 Dof Flight Chair)

Tim Herschbach Member Gold Contributor

Jango Member

Thick8 Just some random guy