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.
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.
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Four depths, one page. Switch at any time: every tier stays open to everyone. What the four tiers mean
1Beginner
What is this machine?
For: Anyone with no robotics background: a visitor, a new operator, a manager Kind of task: Recognise 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.
The six rotary joints, from Joint 1 at the base to Joint 6 at the tool71. Image: UFACTORY
The arm is one part of a system: a control box comes with it by default89. Image: UFACTORY
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.
The arm itself weighs 20 kg, without its control box11.
The working range seen from above, with the 850 mm reach marked3. Image: UFACTORY
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 installation. The contradiction card in Open questions sets out both sides19.
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 that installation does, and at S2 that assessment has not yet been confirmed20. Until it is, 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 ROS21.
Studio runs inside the control box and is opened in a web browser, so nothing has to be installed on the computer22.
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 positions2324.
Hand teaching, as shown on UFACTORY's page for the 850: in manual mode the arm holds itself up so a person can move it2324. Image: UFACTORY
Why it matters here
IntelliMake's Phase 1 factory is designed to demonstrate autonomous production of personalised products25.
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.
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 mm33.
It carries 5 kg, the same as the xArm 6. The xArm 5 is rated 3 kg and the xArm 7 3.5 kg34.
It has six joints, where the xArm 5 has five and the xArm 7 has seven35.
The Lite 6 is UFACTORY's smallest table-top six-axis arm, with a 600 g maximum payload and a 440 mm reach36.
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 list37.
The Lite 6 is listed for lighter-duty work, such as lab automation, coffee machines and touchscreen testing38.
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 claim39.
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 battery40.
Price: why this platform quotes none
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 cables41.
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 disputed4241.
"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 people43.
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. Simulation added in M2/M4 extends this; it does not define it
In this part you pick the right figure for a task, and learn to notice when the figure you need has not been published. It is for someone who will set up, program or maintain the arm.
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 taught45.
That missing figure matters for offline programming and camera-guided picking, which both work from computed coordinates46.
UFACTORY states ±0.1 mm for its xArm series, so the 850's repeatability figure is five times tighter47.
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 G248.
A demo shows that the parts work together. It does not supply the absolute accuracy figure a camera-guided cell would need4846.
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 mm36.
UFACTORY's sources disagree on the Lite 6's repeatability: ±0.5 mm on ufactory.cc, and ±0.1 mm "precision" on UFACTORY USA49.
Collision detection is not a safeguard
UFACTORY lists collision detection among the 850's cobot features23.
No UFACTORY document this platform found calls it safety-rated, or gives it a performance level31.
This project's advice: treat it as a configurable controller function, never as a replacement for risk-assessed protective devices32.
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, the M5 team Kind of task: Analyse 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 performance51.
No source this platform found compares the 850's ±0.02 mm repeatability quantitatively with conventional industrial robots of similar payload. Beyond UFACTORY's own phrase, the comparison is a gap52.
"Half the price"
UFACTORY USA claims mainstream six-axis performance at half the price42.
With three different UFACTORY prices on record, there is no single figure to halve41.
"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 collaborative50.
That record is Inferred, not Verified: A3 is a credible secondary source on the standard, but the standard itself is paywalled and was not read50.
No source shows the 850 assessed for collaborative power and force limiting53, and UFACTORY publishes no contact force or pressure figures54.
Why the 850 at S2?
It is tempting to say IntelliMake chose the 850 for its reach. The reach difference is documented: 850 mm, against 700 mm for the xArm 5/6/7 line55.
But no source says reach decided which arm went to S255, and IntelliMake's reason for two arms, and for their placement, is a recorded gap56.
Whether S2 is even meant to be a collaborative application, with people entering the working area during automatic operation, is unknown until the cell can be observed57.
Check yourself
Answer, then check. Each option has its own feedback, and nothing is scored.
Not settled
Open questions · 10
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.
The S2 installation's risk assessment has not been confirmed: whether one exists for the complete S2 application (arm, gripper, workpieces, S1/S3/S4/S6 interfaces), who performed and signed it, and whether it was redone after installation as UFACTORY requires.
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.
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.
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'.
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'.
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 permissible contact forces and speeds for collaborative use are undocumented.
No fetched UFACTORY source says whether the 850 is suitable or validated for power and force limiting collaborative applications. UFACTORY publishes no contact force or pressure figures, and gives no force or torque threshold for each collision sensitivity level.
IntelliMake's reason for using two arms, and for putting the 850 at S2 and the xArm 6 at S6, is not documented in any source available to this project (Q14d).
It is unknown whether S2 is intended to be a collaborative application, with people entering the arm's working area during automatic operation. If it is, it is also unknown which collaborative method is used and how it has been validated.
UFACTORY itself uses the name 'xArm 850' for the 850: its V2.7.0 release note refers to 'xArm 850 arms' in the firmware changes and to 'xArm 850' in the UFACTORY Studio changes.
Evidence · 2 citations
Added compatibility for xArm XX1305-series and xArm 850 arms whose serial number has an "E" as the third character from the end.
The 850 arm consists of a base and six rotary joints, numbered Joint 1 (at the base) to Joint 6; the last joint is the tool side, where end effectors attach.
Evidence · 2 citations
Quote not shown (over 40 words). See the source at: 2.1.1 Hardware Composition (docs site 'UFACTORY 850 硬件手册', English version; names the machine 'UFACTORY 850').
UFACTORY 850 Hardware Manual (online), 2. Hardware Installation · UFACTORY · 2.1.1 Hardware Composition (docs site 'UFACTORY 850 硬件手册', English version; names the machine 'UFACTORY 850')
The online hardware manual lists the 850's hardware composition as the robotic arm, an AC controller, a DC controller, the 850 power and signal cable, a mounting tool, and end effectors (Gripper, Vacuum Gripper, BIO Gripper G2, FT Sensor).
Evidence · 1 citation
UFACTORY 850 Robotic Arm AC Controller DC Controller 850 Power and Signal cable Mounting Tool End Effector(Gripper, Vacuum Gripper, BIO Gripper G2, FT Sensor)
UFACTORY 850 Hardware Manual (online), 2. Hardware Installation · UFACTORY · 2.1.1 Hardware Composition (docs site 'UFACTORY 850 硬件手册', English version; names the machine 'UFACTORY 850')
The 850's maximum payload is 5 kg, which covers the end-of-arm tool and the part it holds.
Why we infer this:Verified: UFACTORY's specification table gives the 850 a maximum payload of 5 kg (spec-002), but does not say whether the end-of-arm tool counts toward it. Verified: the UFACTORY Studio glossary, which applies to the 850 (iface-145), defines the TCP payload setting as the actual weight of the 'end tool & other object'. No UFACTORY source joins the two in one statement. This platform infers that the 5 kg rating is read against the same total the controller models, tool plus part, so the tool's weight leaves less for the part. Until UFACTORY states it, treat that as an inference, not a rating.
UFACTORY has demonstrated the 850 with the RH56DFX dexterous robot hand handling fragile objects such as eggs, drilling cardboard with an electric drill, and operating a computer mouse.
Evidence · 1 citation
From handling fragile objects like eggs and oranges without damage, to drilling into cardboard with an electric drill, and even controlling a computer mouse to switch web pages.
UFactory 850 Robot Arm Works Seamlessly with Dexterous Hand RH56DFX · UFACTORY · Video description
UFACTORY makes the integrator of the 850 responsible for a risk assessment of the complete system, including keeping a safe distance between people and the 850 when they interact with it.
Evidence · 1 citation
Making a risk assessment for the complete system. Make sure to have a safe distance between people and 850 when interacting with the 850.
UFACTORY 850 Hardware Manual (online), 1. Safety · UFACTORY · 1.1 Validity and Responsibility, integrator responsibilities list
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.
“Collaborative application” is used instead, as only the actual use of the robot can be designed, tested, and confirmed as a collaborative application.
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) · FAQ 6
The S2 installation's risk assessment has not been confirmed: whether one exists for the complete S2 application (arm, gripper, workpieces, S1/S3/S4/S6 interfaces), who performed and signed it, and whether it was redone after installation as UFACTORY requires.
Awaiting cell access: this could be confirmed or corrected once the physical S2 cell can be observed.
UFACTORY's 850 page, under 'Flexible Deployment With Safe Feature', cites hand teaching, a space-saving footprint and easy re-deployment to multiple applications without changing the production layout, and says collision detection is available for all its cobots.
Evidence · 2 citations
Hand teaching, space-saving and easy to re-deploy to multiple applications without changing your production layout. Perfectly for recurrent tasks.
In manual mode the arm compensates for gravity ('zero gravity'), so a person can move it by hand to teach positions.
Evidence · 1 citation
In this mode, the robotic arm will enter the ‘zero gravity’ mode, since the gravity is compensated, the user can guide the robotic arm position directly by hand.
UFACTORY Studio User Manual (online), 2. Glossary · UFACTORY · Glossary, 'Manual Mode'
S4, the Laser Engraver Conveyor, transfers workpieces through the laser processing area.
Evidence · 1 citation
Transfers workplaces through the laser processing area.
IntelliMake Phase 1 Factory: Autonomous Production Demonstrator (infographic) · IntelliMake.org · S4 station description (the diagram prints 'workplaces'; read as workpieces)
No fetched UFACTORY document calls the 850's collision detection, safety boundary or reduced mode safety-rated, or gives them a performance level.
Why we infer this:Verified: collision detection is a model-based current comparison that UFACTORY says can false-trigger with wrong settings and can be disabled (level 0, Advanced Settings toggle, a documented default password); safety boundary and reduced mode are software settings exposed in Studio and the SDK. UFACTORY distinguishes safety signals (EI/SI, redundant pairs) from non-safety devices. Inferred: no fetched UFACTORY source assigns a PL, Category or safety rating to these software functions (see the gap on performance level); this is a statement about the documents fetched, not proof that no rating exists.
Evidence · 3 citations
By comparing the theoretical current and actual current of each joint, the system determines whether a collision has occurred.
Collision Detection in UFACTORY Robotic Arms: Current and Dynamic Model-based Feature (UFACTORY support article) · UFACTORY · Section 1
Never connect a safety signal to a non-safety PLC.Failure to follow this warning may result in serious injury or death due to an invalid safety stop function.
Kind: RecommendationThis project's simulation and agent design, not the physical cellProject design, not the physical cellsafety-140
Project advice
Treat the 850's collision detection, safety boundary and reduced mode as configurable controller functions, not as validated safeguards: they must not replace the risk-assessed protective devices wired to the EI and SI inputs.
This is advice from this project, based on: safety-087 Inferredsafety-062 Verifiedsafety-067 Verifiedsafety-073 Verifiedsafety-074 Verifiedsafety-057 Verified
Why:No fetched UFACTORY document gives these functions a safety rating or performance level (safety-087). Collision detection is a current-model comparison that can false-trigger and can be switched off (safety-062, safety-067); safety boundary and reduced mode are software settings (safety-073, safety-074). UFACTORY keeps safety signals separate from non-safety devices (safety-057). A function with no documented rating cannot stand in for a rated protective device.
UFACTORY lists machine tending, bin picking, mobile platforms, lab automation and robotic research as ideal uses on its xArm (xArm 5/6/7) page; machine tending does not appear in the 850 page's 'Ideal for' list.
Evidence · 2 citations
Ideal for: ￮ Machine Tending ￮ Bin Picking ￮ Mobile platform ￮ Lab Automation ￮ Robotic Research
UFACTORY lists the Lite 6 as ideal for lab automation, robotic research, coffee machines and touchscreen or keyboard testing, all lighter-duty uses than those listed for the 850.
Evidence · 1 citation
Ideal for: ￮ Lab Automation ￮ Robotic Research ￮ Coffee Machine ￮ Touchscreen or Keyboard Testing
UFACTORY Lite 6 product page · UFACTORY · Hero banner, 'Ideal for' list
UFACTORY designs the 850 for both workbench and mobile-platform use: the AC control box takes 100-240 V AC mains, and the DC control box accepts 48-72 V DC to suit a mobile platform's battery system.
Evidence · 2 citations
The DC control box supports 48-72V wide inputs, it perfectly fits the battery system on your mobile platform.
UFACTORY 850 product page · UFACTORY · 'Designed for both mobile platforms and your workbench' section
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.
Calling the 850 'collaborative' does not make a given installation safe to share with people: UFACTORY's own manual requires a risk assessment of the complete system by the integrator and says to keep people out of the working area while it runs.
Why we infer this:UFACTORY uses 'collaborative' as a product description (app-017, app-018). The 850 hardware manual separately puts responsibility for a complete-system risk assessment on the integrator and instructs that no people be in the working area during operation. So the label describes the arm's features (hand teaching, collision detection), not a guarantee that a particular cell allows people to work beside the arm.
UFACTORY states 850 repeatability (±0.02 mm), which is how closely it returns to a taught point, but the sources fetched give no absolute accuracy figure for how closely it reaches a computed coordinate.
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.
UFACTORY's open-source ufactory_vision project provides vision-based object detection and grasping demos that support the 850 with Intel RealSense D435/D555 or Luxonis OAK-D-Pro-PoE cameras and the UFACTORY Gripper G1/G2.
Evidence · 2 citations
`ufactory_vision` is a vision-based grasping demo project based on UFACTORY robot arms. Users can quickly implement vision-based object detection and grasping with this project.
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'.
A3 says the terms 'collaborative robot' and 'collaborative operation' do not appear in ISO 10218:2025. The standard uses 'collaborative application' instead, because only the actual use of a robot can be designed, tested and confirmed as collaborative. Collaborative safety is therefore a property of the application, not of the robot alone.
Why we infer this:A3 served as secretary of ISO TC 299 WG3, which drafted ISO 10218:2025 (stated on the page), so it is a credible secondary source for the standard's terminology. The standard itself is paywalled and was not read.
Evidence · 2 citations
The terms “collaborative robot” and “collaborative operation” will not be found in the revised ISO 10218. “Collaborative application” is used instead, as only the actual use of the robot can be designed, tested, and confirmed as a collaborative application.
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) · FAQ 6
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'.
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 permissible contact forces and speeds for collaborative use are undocumented.
Related: app-019 Inferredsafety-082 Verifiedsafety-086 Inferredsafety-122 Gapsafety-126 Gapspec-086 Gap
No fetched UFACTORY source says whether the 850 is suitable or validated for power and force limiting collaborative applications. UFACTORY publishes no contact force or pressure figures, and gives no force or torque threshold for each collision sensitivity level.
Related: safety-065 Verified
Evidence · 1 citation
The larger the value is set, the higher the collision sensitivity level is, and the smaller the additional torque required for the robotic arm to trigger collision protection.
UFACTORY Studio User Manual (online), 7. Settings · UFACTORY · 7.1.1: sensitivity described only qualitatively
UFACTORY publishes a longer reach for the 850 (850 mm, maximum payload 5 kg) than for its xArm 5/6/7 line (700 mm, with payloads from 3 kg to 5 kg across the line). No xArm 6-specific figure is cited here, and no source says whether reach decided which arm went to S2.
IntelliMake's reason for using two arms, and for putting the 850 at S2 and the xArm 6 at S6, is not documented in any source available to this project (Q14d).
It is unknown whether S2 is intended to be a collaborative application, with people entering the arm's working area during automatic operation. If it is, it is also unknown which collaborative method is used and how it has been validated.
Awaiting cell access: this could be confirmed or corrected once the physical S2 cell can be observed.
Evidence · 1 citation
“Collaborative application” is used instead, as only the actual use of the robot can be designed, tested, and confirmed as a collaborative application.
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) · FAQ 6
