Table of Contents
⚠ Disclaimer: This entry may be incomplete, out of date, or inaccurate. It is AI-maintained on a best-effort basis. Do not rely on it as a sole source — verify claims independently using the sources listed below.
Summary
OpenTree is a website that lists non-Chinese parts for robots and drones, with the tagline “Parts you need; risk you don’t.” Each listed part is shown against the part it replaces. The site is operated by Sentinel Automata, which also lists OpenTree as an affiliated page on LinkedIn, and it states it is not affiliated with Unitree or the G1 trademark owners. It is aimed at robotics companies facing the FCC’s new robot rule and its Buy American–style domestic-content definitions, and it doubles as a sourcing map for the US component supply chain described in the Actuators overview.
Key Facts
- Operator: Sentinel Automata (founder Ian Daily); pre-production, with a Long Beach, CA pin on its own map
- Business model: Not stated — the site has a parts catalog, a “List parts” page for suppliers and a “Reserve” page, but does not say whether it sells directly or takes commissions
- Supplier listing: Non-China makers can list by December 31, 2026; listing is free through 2027 with no contract
- Tools and content: parts catalog; “Our joints” page; guides; map; FCC 65% calculator that totals a robot’s US-made component cost in the browser
- Site statistics (company-reported): a typical robot scores 27% US parts by cost, or 73% after swapping in US joints; two joints listed; no drone parts yet
- Contact: hello@opentree.shop
The US Component Map
The map, last checked November 6, 2026, shows 40 pinned companies at 52 locations, and says 60 more companies are listed below the pins across 20 states. Inclusion rules stated on the page:
- A pin requires the company’s own site to say it makes the part at that location; offices and foreign makers’ US sales arms are listed but not pinned.
- Makers controlled by a PRC-controlled company, and companies on the 1260H or Entity lists, are excluded.
- Origin and location claims come from company websites and are unverified; “not stated” means not found.
- The map presents listing facts, not endorsements or legal certification.
Pinned companies, grouped by component family (grouping approximate; the page does not assign families to each entry):
| Family | Pinned companies |
|---|---|
| Joints and actuators | HEBI Robotics (Pittsburgh, PA), Tolomatic (Hamel, MN) |
| Bearings | SKF Kaydon, Schatz Bearing, NHBB, Auburn Bearing & Manufacturing, Schaeffler (Danbury, CT) |
| Encoders and sensors | US Digital (Vancouver, WA), Encoder Products Company (Sagle, ID), FUTEK (Irvine, CA) |
| Frameless motors | ThinGap (Camarillo, CA), maxon (Taunton, MA), ElectroCraft (Gallipolis, OH; Princeton, IN) |
| Drives and controllers | Moog Animatics (Murphy, NC), ADVANCED Motion Controls (Camarillo, CA), Galil Motion Control (Rocklin, CA) |
| Laminations, winding and magnet wire | Windings Inc., Thomson Lamination, Essex Solutions, Rea Magnet Wire, MWS Wire Industries, Tempel (Worthington Steel) |
| Magnets | Noveon Magnetics (San Marcos, TX), Vulcan Elements (Research Triangle Park, NC), Arnold Magnetic Technologies (Rochester, NY), MP Materials (Fort Worth, TX), USA Rare Earth (Stillwater, OK), Niron Magnetics (Minneapolis, MN) |
| Gears and reducers | Cone Drive, Forest City Gear, Arrow Gear, Schafer Gear Works, Harmonic Drive LLC (Beverly, MA), Gear Motions |
| Other / not stated | OpenTree and Resolved Motion (both pre-production), Westmag, Laser Technologies, Onvio, ASCO Sintering |
The company’s own framing is that most of the map is empty, which it presents as the finding: few robot-part categories have confirmed US makers.
Profiled Entries
Entries in this research section for companies pinned on the map: Actuators and gears, Bearings, Magnets, Motor Materials, Encoder Products Company and FUTEK. Map companies not yet profiled include Schaeffler, Arnold Magnetic Technologies, MP Materials, US Digital, Galil Motion Control, ADVANCED Motion Controls, HEBI Robotics, Harmonic Drive LLC and maxon (Taunton, MA); some of these are covered elsewhere in the section.
Why It Matters
OpenTree is both a sourcing tool and a market-positioning move for its operator: it gives US robotics buyers a way to check bill-of-materials provenance while directing attention to US-made joints, which is Sentinel Automata’s own product category. Readers should weigh it as a company-run directory rather than a neutral registry.
Claim Verification
Claim: 40 pinned US robot-component makers across the map
Status: Unverified (company-published directory; origin claims taken from each listed company’s own site and not independently audited)
Supporting sources:
Claim: A typical robot is 27% US parts by cost (73% with US joints)
Status: Unverified (company-reported calculator output; methodology not published on the page reviewed)
Supporting sources: