As I'd posted up in another thread, one of the drawbacks to the rack and pinion linear servo setup in our new cylinders is the limited throw that it supplies (about 5mm). This can be overcome with proper setup of your control horns and other linkage connections, but it would be more ideal to have additional throw to play with.
I recall years (and years) ago, seeing something that used a wheel with steel cables to push and pull a linkage rod. This is a bit labor-intensive to produce, but the advantage is perfect linear motion with a high degree of flexibility in terms of alignment.
A couple of iterations and I came up with the following:


This simply press-fits onto a standard servo and provides over 12mm of travel end-to-end. I'm going to tweak this a bit for fitment and then I think this will be the new servo endcaps on our SubDrivers. Unfortunately, the outputs are not the same as the previous endcaps, so if you wanted to upgrade to the new version, you'd either need a new endcap assembly, or you'd need to fill the old holes and drill new ones for the linkage seals.
Bob
I recall years (and years) ago, seeing something that used a wheel with steel cables to push and pull a linkage rod. This is a bit labor-intensive to produce, but the advantage is perfect linear motion with a high degree of flexibility in terms of alignment.
A couple of iterations and I came up with the following:
This simply press-fits onto a standard servo and provides over 12mm of travel end-to-end. I'm going to tweak this a bit for fitment and then I think this will be the new servo endcaps on our SubDrivers. Unfortunately, the outputs are not the same as the previous endcaps, so if you wanted to upgrade to the new version, you'd either need a new endcap assembly, or you'd need to fill the old holes and drill new ones for the linkage seals.
Bob
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