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website: Add FAQ entry for the arm not reaching the commanded position - #639

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kou merged 1 commit into
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kou:docs/faq-steady-state-error
Oct 26, 2026
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kou merged 1 commit into
enactic:mainfrom
kou:docs/faq-steady-state-error

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@kou kou commented Oct 26, 2026

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Users who control the arm by joint positions see a steady-state error and the end effector sagging, especially with the arm extended. The cause is the low default gains of the MIT mode PD control, but the docs didn't say so from the symptom side.

Add an FAQ entry that recommends increasing Kp first, the tuning order, that OpenArm software has no integral loop or disturbance observer, and links to the default and higher gains we use.

Users who control the arm by joint positions see a steady-state error
and the end effector sagging, especially with the arm extended. The
cause is the low default gains of the MIT mode PD control, but the docs
didn't say so from the symptom side.

Add an FAQ entry that recommends increasing Kp first, the tuning order,
that OpenArm software has no integral loop or disturbance observer, and
links to the default and higher gains we use.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Copilot AI balanced review requested due to automatic review settings October 26, 2026 05:51

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kou merged commit 0f0ad21 into enactic:main Oct 26, 2026
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kou deleted the docs/faq-steady-state-error branch October 26, 2026 05:56
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