#✅ - servo mis timed/ servo alignment issues.

10 messages · Page 1 of 1 (latest)

karmic panther
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So the servos aren't moving in time with each other one lagging and moving further than the other. Board is a new mke mini with the pulser.

This issue is repeatable with another pair of servos. Mg90s Which leads me to believe this is a coding issue.

I haven't had a chance to look into the actual mke since I have zero experience with that. ( Though this issue leads me to believe I'm gonna learn soon trying to fix it). I reached out to the seller on eBay and they told me to post it here for help.

hollow leafBOT
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Hey @karmic panther, thank you for contributing to this forum.
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karmic panther
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Im seriously about to just buy a servo trigger or something.

inland idol
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That is normal. Once you install the faceplate and helper arms the entire linkage system normalizes.

karmic panther
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I don't recall this happening on my last board. And the over travel seems like it's going to hit servo stall. But you're sure?

inland idol
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The slight misalignment of 1 to 2 degrees between the servos is actually normal for this setup. When the faceplate and helper arms are installed, they create a 4-point linkage system that helps keep everything in alignment. Once everything is fully assembled, the servos should move in sync as expected.

The slight offset you’re seeing right now shouldn’t impact the final movement once everything is installed.

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A 4-point linkage system, also known as a four-bar linkage, is a mechanical system commonly used in various engineering and robotics applications to transfer motion or force in a controlled manner. Here’s how it works in simple terms:

Four Components: The system consists of four rigid components (bars or arms) connected by pivot points. In the case of your helmet, these components include:

  • The servo arms (which move the parts)
  • The faceplate
  • The helper arms (which help guide and stabilize the movement)
  • The helmet frame (which acts as a fixed base)

How It Moves: One of the servo arms (the actuator) rotates or moves, causing the other connected bars to move in a predetermined, synchronized pattern. The linkage system distributes this motion, ensuring that all parts move together, even if the servos themselves are slightly out of alignment.

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Stability: In a 4-point linkage system, even if one component (like a servo arm) is off by a small amount (in your case, 1 to 2 degrees), the other components will work together to correct and stabilize the motion. The linkage keeps everything in sync because the movement of one bar influences the movement of the others, making sure the faceplate stays aligned as the servos work together.

Precision with Flexibility: This system is commonly used in situations where precise movement is needed but slight mechanical imperfections (like small servo misalignments) exist. The fixed pivot points ensure that, once assembled, the servos’ slight differences in position don’t cause major issues—the system naturally corrects and maintains alignment.

In your helmet setup, this means that once the faceplate and helper arms are installed, the 4-point linkage system will correct for any minor misalignments between the servos, ensuring they work together smoothly.

karmic panther
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understood, thanks for clarifying! i'll hopefully be able to get my dry fitting done today, and finally move on to the paint portion.

hollow leafBOT