§1 xArm 850
xArm 850 Overview
What the machine is, what arms like it are used for, where it sits in its maker's range, and why it is at IntelliMake.
Start Here
This section says what this machine is, what arms like it are used for, where it sits in its maker's range, and why IntelliMake uses it. Every tier below starts from the same three facts.
- It is a robot arm with six rotary joints1.
- UFACTORY sells it as the UFACTORY 850, and also calls it the xArm 8504.
- At IntelliMake's Phase 1 factory it is station S25.
S2 in one line: S2 is the xArm 850 arm that picks up incoming material and moves it between receiving, staging and production56.
Choose your depth
1Beginner
What Is This Machine?
For: Anyone with no robotics background: a visitor, a new operator, a manager
Kind of task: Recognize and recall, with plain-language explanations and pictures
In this part you meet the machine, learn three numbers that describe it, and see why a "collaborative" label does not tell you whether it is safe to stand next to it. No robotics background is needed.
The Machine
The UFACTORY 850, which UFACTORY also calls the xArm 850, is a robot arm4. It has a base and six rotating joints, numbered from Joint 1 at the base to Joint 6 at the tool end, where tools attach71.


Its Size and Strength in Three Numbers
- It can carry at most 5 kg2. This platform infers that the tool on its end counts toward that 5 kg, because UFACTORY's payload setting counts the tool and the part together. A heavier tool then leaves less for the part it holds10.

What Arms Like It Do
- Under material handling, UFACTORY lists pick-and-place, bin picking and kitting among the jobs cobots do12.
- UFACTORY's page for the 850 lists it as ideal for welding, screwdriving, robot vision and industrial production13.
- UFACTORY has shown the 850 welding14, and handling eggs with a dexterous robot hand15. Both come from UFACTORY videos without captions, so this page states what they show in words.
"Collaborative Robot" Is a Label, Not a Promise
- UFACTORY defines collaborative robots, or cobots, as robots that share tasks and spaces with people16.
- Yet UFACTORY's own manual for the 850 says no people should be in the arm's working area while it is running17.
- It also makes whoever integrates the arm responsible for a risk assessment of the whole system18.
- So the sources pull in different directions about what the label means for a real installation19.
- The point: a label on the box does not tell you whether it is safe to stand next to the arm. The risk assessment for the whole installation covers how far people keep from it18, and UFACTORY's rule is to stay out of the working area while the arm runs17.
How People Tell It What to Do
- People program it graphically in UFACTORY Studio, or in code with Python, C++ or ROS20.
- UFACTORY describes Studio as software that runs inside the control box21. The lab uses the Studio desktop app, downloaded from UFACTORY and installed on the computer2223.
- People can also teach it by hand. In manual mode the arm holds itself up against gravity, so a person can move it and record positions2425.

Why It Matters Here
- IntelliMake's Phase 1 factory is designed to demonstrate autonomous production of personalized products26.
- There, as station S2, this arm picks up incoming material and moves it between receiving, staging and production56.
What "Verified" Means on This Page
Almost every record on this page is Verified. Verified means a manufacturer or IntelliMake document says so. It does not mean anyone has measured it at the physical cell. Where a record is Inferred, the reasoning is printed under it; where something is unknown, it is marked as a gap and no number is given.
Check Yourself
Answer, then check. Each option has its own feedback, and nothing is scored.
Open questions in this section
Next on the beginner path: §2 Role in the Phase 1 Production Process
2Novice
Where the 850 Sits in Its Family
For: Someone who will work near or with the cell: operator, trainee technician
Kind of task: Explain and sequence: put steps in order, match parts to their functions
In this part you compare the machine with its siblings, read the maker's claims about durability and power, and see why this platform quotes no single price. It is for someone who will work near or with the cell.
The 850 and Its Siblings
- The 850 reaches 850 mm. UFACTORY's xArm 5/6/7 arms reach 700 mm34.
- It carries 5 kg, the same as the xArm 6. The xArm 5 is rated 3 kg and the xArm 7 3.5 kg35.
- It has six joints, where the xArm 5 has five and the xArm 7 has seven36.
- The Lite 6 is UFACTORY's smallest table-top six-axis arm, with a 600 g maximum payload and a 440 mm reach37.
What Each Arm Is "ideal for"
- UFACTORY's xArm page lists machine tending, bin picking, mobile platforms, lab automation and robotic research. Machine tending is not on the 850's list38.
- The Lite 6 is listed for lighter-duty work, such as lab automation, coffee machines and touchscreen testing39.
What UFACTORY Says About Durability and Power
- UFACTORY says the 850's harmonic drives and servomotors with 17-bit encoders support 24/7 operation and ±0.02 mm repeatability. That is the maker's own claim40.
- There are two control boxes. The AC box takes 100–240 V AC mains, for a workbench. The DC box takes 48–72 V DC, to suit a mobile platform's battery41.
Price: UFACTORY's Own Figures Disagree
- UFACTORY's own sites give three prices for the 850: US$9,899 in the 850 page header, "From US$8,999" in the same page's footer, and US$10,500 on UFACTORY USA for the arm with a control box and 2 m cables42.
- UFACTORY USA also says the 850 gives mainstream six-axis performance at half the price. Treat that as marketing: the price it rests on is itself disputed4342.
"Collaborative" Is Not the Same as "Safe Here"
- This platform infers that calling the 850 collaborative does not make a given installation safe to share with people44.
- The inference rests on two Verified statements in UFACTORY's manual: the integrator must risk-assess the complete system, and people stay out of the working area while the arm runs1817.
Check Yourself
Answer, then check. Each option has its own feedback, and nothing is scored.
3Intermediate
Matching the Machine to a Task
For: Someone who will set up, program or maintain the arm: technician, student engineer
Kind of task: Apply: work through written scenarios that need a decision (which mode, which setting, what to do about this error), with feedback on each choice
In this part you pick the right figure for a task, and learn to notice when the figure you need is not in the sources. It is for someone who will set up, program or maintain the arm.
Repeatability Is Not Accuracy
- The 850's stated repeatability is ±0.02 mm45.
- Repeatability is how closely the arm returns to a point it was taught. The sources give no absolute accuracy figure, which is how closely it reaches a coordinate that was computed rather than taught46.
- That missing figure matters for offline programming and camera-guided picking, which both work from computed coordinates47.
- UFACTORY states ±0.1 mm for its xArm series, so the 850's repeatability figure is five times tighter48.
Vision Picking
- UFACTORY's open-source ufactory_vision project has object-detection and grasping demos that support the 850, with Intel RealSense or Luxonis cameras and UFACTORY's Gripper G1 or G249.
- A demo shows that the parts work together. It does not supply the absolute accuracy figure a camera-guided cell would need4947.
The Lite 6 Against the 850
- The Lite 6 carries at most 600 g and reaches 440 mm, well below the 850's 5 kg and 850 mm37.
- UFACTORY's sources disagree on the Lite 6's repeatability: ±0.5 mm on ufactory.cc, and ±0.1 mm "precision" on UFACTORY USA50.
Collision Detection Is Not a Safeguard
Check Yourself
Answer, then check. Each option has its own feedback, and nothing is scored.
4Expert
Judging Marketing Claims Against Evidence
For: Someone who designs, integrates or changes the cell: integrator, engineer, agent developer
Kind of task: Analyze and decide: weigh trade-offs, resolve contradictions, critique a configuration
In this part you test the maker's marketing phrases against the evidence, and separate what is documented from what is merely plausible. It is for someone who designs, integrates or changes the cell.
"Industrial-grade"
- UFACTORY markets the 850 as its most powerful robot, with industrial-grade performance52.
- The sources give no quantitative comparison of the 850's ±0.02 mm repeatability with conventional industrial robots of similar payload. There is only UFACTORY's own phrase53.
"Half the price"
- UFACTORY USA claims mainstream six-axis performance at half the price43.
- With three different UFACTORY prices on record, there is no single figure to halve42.
"Collaborative Robot"
- The 850 page calls UFACTORY arms collaborative robots. A3 reports that ISO 10218:2025 drops that term, and UFACTORY's own manual keeps people out of the working area during operation19.
- A3 says the standard speaks of collaborative applications instead, because only the actual use of a robot can be confirmed as collaborative51.
- That record is Inferred, not Verified: it rests on A3, a credible secondary source on the standard, not on the standard's own text51.
- The sources show no assessment of the 850 for collaborative power and force limiting54, and the UFACTORY sources give no contact force or pressure figures55.
Why the 850 at S2?
Check Yourself
Answer, then check. Each option has its own feedback, and nothing is scored.
Not settledOpen Questions · 7
What the sources do not settle for this section. Nothing here is papered over with a plausible number.
- Kind: Contradiction
The 850 product page calls UFACTORY arms 'Collaborative Robots' and 'cobots'. A3 says ISO 10218:2025 drops 'collaborative robot' because only an application can be confirmed as collaborative, and UFACTORY's own 850 manual says no people should be in the working area during operation. The marketing label does not establish that S2 is a collaborative application.
See reference 19 - Kind: Contradiction
UFACTORY's site gives three different prices for the 850: US$9,899 in the 850 page header, 'From US$8,999' in the same page's footer and in UFACTORY's welding video, and US$10,500 on UFACTORY USA for the arm with a control box and 2 m cables.
See reference 42 - Kind: Gap
The absolute positioning accuracy of the 850, and how much UFACTORY's post-August-2023 kinematic calibration improves it, is not published in any fetched source. This matters for offline programming and vision-guided picking, which rely on computed rather than taught coordinates.
See reference 47 - Kind: Contradiction
UFACTORY sources disagree on the Lite 6's repeatability, which matters when comparing it with the 850: ufactory.cc gives ±0.5 mm, while UFACTORY USA gives ±0.1 mm 'precision'.
See reference 50 - Kind: Gap
No fetched source compares the 850's ±0.02 mm repeatability quantitatively with conventional (non-collaborative) industrial robots of similar payload, beyond UFACTORY's own marketing phrase 'industrial grade performance'.
See reference 53 - Kind: Gap
No fetched source shows the 850 assessed for collaborative power and force limiting (the former ISO/TS 15066 content, now in ISO 10218-2:2025). The SGS verification covers only EN ISO 10218-1:2011 (safety-082), so the fetched sources do not document permissible contact forces and speeds for collaborative use.
See reference 54 - Kind: Gap
No fetched UFACTORY source says whether the 850 is suitable or validated for power and force limiting collaborative applications, gives contact force or pressure figures, or gives a force or torque threshold for each collision sensitivity level.
See reference 55
ProvenanceReferences · 58
Each number in the text points here. Every entry states its confidence class in words and keeps its evidence one click away. How to read the labels.
Key to the badges
- Confidence: Verified
- A manufacturer or IntelliMake document says so, the project owner stated it as the design, or it was observed directly. It does not mean anyone measured it at S2.
- Confidence: Inferred
- Reasoned from Verified facts. The reasoning is printed with the record.
- Confidence: Assumed
- Plausible but untested. The record says how it would be checked.
- Kind: Gap
- Not known. No figure or answer is given in its place.
- Kind: Contradiction
- Sources disagree. Both sides are shown, and the site does not pick one silently.
- Kind: Recommendation
- Project advice drawn from the records it cites. Not a fact about the machine and not a confidence class, so the filter never hides it.
- Awaiting cell access
- Awaiting cell access: could be confirmed or corrected once the physical S2 cell can be observed.
- This project's simulation and agent design, not the physical cell
- This project's simulation and agent design, not the physical cell.
Image Credits
- A white UFACTORY 850 arm with its six joints labeled 1 to 6, each with its rotation range. © UFACTORY (Shenzhen UFACTORY Co., Ltd.). Source. Used with UFACTORY's written permission (2026-09-23), on the condition that each image links back to its source page.
- The 850 system laid out: the arm, the AC and DC control boxes, an emergency stop button, cables, a mounting tool, a force torque sensor and three grippers. © UFACTORY (Shenzhen UFACTORY Co., Ltd.). Source. Used with UFACTORY's written permission (2026-09-23), on the condition that each image links back to its source page.
- Top view of the 850 on its base, with a shaded circle showing its working range and an 850 mm radius marked. © UFACTORY (Shenzhen UFACTORY Co., Ltd.). Source. Used with UFACTORY's written permission (2026-09-23), on the condition that each image links back to its source page.
- A person's hand pushing a white UFACTORY arm by its wrist to move it. © UFACTORY (Shenzhen UFACTORY Co., Ltd.). Source. Used with UFACTORY's written permission (2026-09-23), on the condition that each image links back to its source page.
- 3D model: © 2018 UFACTORY Inc., BSD-3-Clause, from UFACTORY Inc. (xArm-Developer/xarm_ros2). License text · Source
Sources for This Section
- Collaborative robot applications · UFACTORY (manufacturer)
- Collision Detection in UFACTORY Robotic Arms: Current and Dynamic Model-based Feature (UFACTORY support article) · UFACTORY (manufacturer)
- IntelliMake Phase 1 Factory: Autonomous Production Demonstrator (infographic) · IntelliMake.org (IntelliMake)
- OSHA Safety and Health Topics: Robotics, Standards · U.S. Occupational Safety and Health Administration (government)
- OSHA Technical Manual (OTM) Section IV: Chapter 4, Industrial Robot Systems and Industrial Robot System Safety · U.S. Occupational Safety and Health Administration (government)
- Owner statements from 2026-09-24 onward (verbatim; S40 and later) · Derek Stringfellow (project owner)
- The difference between UFACTORY xArm5, UFACTORY xArm6 and UFACTORY xArm7 (Help Center article) · UFACTORY (manufacturer)
- UFACTORY 850 Hardware Manual (online), 1. Safety · UFACTORY (manufacturer)
- UFACTORY 850 Hardware Manual (online), 2. Hardware Installation · UFACTORY (manufacturer)
- UFACTORY 850 Hardware Manual (online), 3. Controller Electrical Interface · UFACTORY (manufacturer)
- UFACTORY 850 Hardware Manual (online), 8. Technical Specifications · UFACTORY (manufacturer)
- UFACTORY 850 product page · UFACTORY (manufacturer)
- UFactory 850 Robot Arm Works Seamlessly with Dexterous Hand RH56DFX · UFACTORY (video)
- UFACTORY 850 User Manual V2.3.0 (PDF, older edition) · UFACTORY (manufacturer)
- UFACTORY 850 Welding Cobot— Integrated by Heronitec Solution · UFACTORY (video)
- UFACTORY Lite 6 product page · UFACTORY (manufacturer)
- UFACTORY Release Note v2.7.0 · UFACTORY (manufacturer)
- UFACTORY Studio product and download page · UFACTORY (manufacturer)
- UFACTORY Studio User Manual (online), 2. Glossary · UFACTORY (manufacturer)
- UFACTORY Studio User Manual (online), 7. Settings · UFACTORY (manufacturer)
- UFACTORY USA 850 product page · UFACTORY USA (manufacturer)
- UFACTORY xArm product page · UFACTORY (manufacturer)
- ufactory_vision README (GitHub) · UFACTORY (xArm-Developer) (manufacturer)
- Updated ISO 10218: Answers to Frequently Asked Questions (FAQs) (A3 blog, 03/20/2025; Wayback Machine snapshot 2025-10-06) · Association for Advancing Automation (A3) (secondary)
IntelliMake diagrams are redrawn as native figures, © IntelliMake.org. UFACTORY does not endorse this platform.