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Prevent SO101 elbow self-collision within allowed joint range - #332

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sylvesterkaczmarek:fix/325-so101-elbow-self-collision-limits-20261010
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sylvesterkaczmarek wants to merge 3 commits into
google-deepmind:mainfrom
sylvesterkaczmarek:fix/325-so101-elbow-self-collision-limits-20261010

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@sylvesterkaczmarek

@sylvesterkaczmarek sylvesterkaczmarek commented Oct 10, 2026 •

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Fixes #325.

Set the SO101 elbow_flex joint and actuator upper limits to 1.474 rad, just below first shoulder/gripper contact at 1.4740104 rad in the neutral-pose MuJoCo sweep (3.15.0 and 3.16.0). Negative limit stays -1.69.

The neutral-pose sweep through 1.474 is contact-free. Generic model tests: 375 passed, 1 skipped. test/model_test.py remains model-agnostic. No physical hardware validation.

Comment thread test/model_test.py Outdated
@sylvesterkaczmarek
sylvesterkaczmarek force-pushed the fix/325-so101-elbow-self-collision-limits-20261010 branch from 6a1a1df to 8ca89ed Compare October 15, 2026 14:18
Comment thread robotstudio_so101/so101.xml Outdated
<!-- Joint from upper_arm to lower_arm -->
<!-- Note: 5-degree calibration offset applied to joint range -->
<joint axis="0 0 1" name="elbow_flex" type="hinge" range="-1.69 1.69" class="sts3215"/>
<joint axis="0 0 1" name="elbow_flex" type="hinge" range="-1.69 1.45" class="sts3215"/>

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sur 1.69 hits contact but 1.45 doesn't have the links parallel with each other, can you push this to the absolute limit before it hits contact? thank you!

@sylvesterkaczmarek

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Adjusted to 1.474 rad in 1e4d1a4. First contact is at ~1.4740104 rad (MuJoCo 3.15/3.16); 101 sweep samples below the limit are clear. Generic suite: 375 passed, 1 skipped.

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