Redesigning a workstation for human–robot collaboration starts with the work, not with a robot model. Map what each person does, what the robot does, where they may share space or a workpiece, and how setup, programming, maintenance, changeovers, and faults differ from normal production. Then perform a task- and site-specific risk assessment and select layout, safeguarding, controls, and procedures that address the assessed hazards.
A collaborative-rated robot is not automatically safe beside a worker. Safety belongs to the integrated application: robot, end-effector, workpiece, nearby equipment, software, safeguards, people, and operating conditions. The current standards divide responsibilities between robot-level safety, application integration, and collaborative operation, but a standard or a purchase decision alone does not make a cell compliant.
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What a human–robot workstation redesign actually covers
Human–robot collaboration is an application choice in which a person and an industrial robot may share a task, workstation, workpiece, or physical area under defined conditions. The redesign is therefore broader than replacing a manual station with an arm. It can change material presentation, fixture design, guarding, access routes, controls, training, maintenance methods, and the sequence used during normal and abnormal work.
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Use the term “collaborative” only to describe the intended application and safety functions. It is not a guarantee that a person can safely touch the moving system, enter the cell whenever desired, or rely on the robot’s factory settings.
1. Map the work before selecting a layout
Create a task map that shows who does what, where, with which tool, and under which operating state. Include work that is easy to overlook because it occurs outside the standard cycle.
Identify every person who can overlap the cell
- Operators who load, unload, inspect, or replenish material.
- Material handlers who pass through or deliver parts.
- Setup technicians who change fixtures, programs, or tooling.
- Programmers and integrators who teach or test motion.
- Maintenance workers who enter for inspection, repair, cleaning, or recovery.
- Supervisors, quality staff, contractors, and visitors whose routes could intersect the restricted or safeguarded space.
For each role, record the intended task, the actual reach and body position, the tools used, the time in the area, and the actions taken when the normal cycle does not work. A person who is not part of the standard cycle can still be exposed during a jam, sensor fault, material shortage, or quality hold.
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Draw the sequence for automatic production, manual load and unload, first-piece approval, changeover, startup, shutdown, recovery after a stop, testing, cleaning, and maintenance. Mark where the robot is moving, where it is stopped but energized, and where motion can restart. Record whether the person needs visibility of the tool point, access to a fixture, or physical contact with the workpiece.
Record variants and changes
List every workpiece size, mass, surface, orientation, and packaging condition. Note end-effector variants, fixture adjustments, process recipes, and nearby equipment that may be added later. A risk assessment based on one light, blunt part is not automatically valid for a heavier part, a sharp edge, or a different gripper.
2. Perform the risk assessment at every lifecycle stage
The OSHA Technical Manual, Section IV, Chapter 4, states: “At each stage of development of the robot application (design, manufacturing, integrating, operating, and maintaining), a risk assessment should be performed.” Treat that as a continuing engineering activity rather than a document completed once at the concept stage.
Assess the factors that change the risk
Examine tasks, startup and programming, the physical environment, location, foreseeable worker error, maintenance, system malfunction, normal operation, emergencies, and worker duties. Consider the robot’s motion and stopping behavior, the end-effector, the workpiece, stored energy, pinch and crush points, sharp projections, dropped loads, unexpected restart, and access to restricted areas.
Assess both the likelihood and consequence of contact. A low-force robot can still create a hazardous pinch point against a fixture or nearby machine. A workpiece can add mass and sharp edges even when the arm itself has rounded covers. The assessment must cover contact with the robot, tool, and workpiece, not just the arm.
Involve the people who perform the work
Workers often know where a hand must reach to clear a part, which sensor is difficult to see, or how a jam is actually cleared. Include operators, maintenance, setup, programming, and safety personnel in hazard identification and in trials of the proposed layout. Record their observations and resolve them before commissioning.
Reassess after changes
Trigger a review when the workpiece, end-effector, fixture, process, robot program, guarding, sensor, production rate, surrounding equipment, or worker task changes. Environmental changes such as reduced lighting, a new aisle, or a temporary storage rack can also alter access and visibility. A change-control record should identify what changed, which hazards were reconsidered, and what validation was repeated.
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3. Decide whether people and robots really need shared space
Do not begin by assuming that collaboration is the best answer. First ask the application questions used in OSHA planning guidance:
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- “Is the presence of a person integral to the application?”
- “Do the robot and person have to share a workstation?”
- “Do the robot system and person have to work on the same workpiece simultaneously?”
- “Does the person need to be in physical contact with the robot, end-effector, or workpiece while the robot system is in motion?”
If the answer is no, a separated or intermittently accessed cell may remove hazards more effectively than attempting continuous collaboration. For example, the robot can load a fixture while the operator works at a separate station, or a transfer mechanism can present a completed part outside the robot’s operating area. The best design may still use a robot but avoid shared motion and shared reach.
Define the required interaction
Describe exactly when simultaneous presence is needed: part presentation, inspection, guided handoff, deburring, assembly, or another operation. State whether contact with a moving system is expected, merely possible, or prohibited. Distinguish a worker standing near the cell from a worker reaching into the robot’s path.
Make boundaries understandable
Workers should be able to tell where the collaborative workspace, restricted space, and safeguarded space begin and what state the system is in. Use clear physical boundaries, status indication, controls, and procedures. Do not depend on a label that says “cobot” or on a worker remembering the robot’s nominal reach.
4. Select safeguards for the assessed contact scenario
OSHA discusses several application approaches, including speed and separation monitoring, power and force limiting, monitored stops used with other collaborative methods, protective stops, force and speed limiting, and passive design measures. These are not interchangeable features or a universal recipe. The selected functions must match the assessed contact conditions, stopping performance, tooling, workpiece, and surrounding hazards.
| Application condition | Design question | Potential safeguard direction |
|---|---|---|
| Person and robot remain separated during motion | Can access be prevented or detected before a hazardous movement? | Use physical safeguarding, interlocked access, presence sensing, or speed-and-separation monitoring as justified by the assessment. |
| Person enters a defined area while the robot is stopped | Is the stop controlled, monitored, and maintained until the area is clear? | Use a monitored stop and controls that prevent unexpected restart; combine with other safeguards where required. |
| Person and robot share a task or workpiece, with possible contact | What body part, tool, or workpiece could contact what moving element, and with what consequence? | Evaluate power-and-force limiting, speed limits, contact surfaces, tool geometry, and protective stops for the actual application. |
| Contact is not required but cannot be ruled out | Can the layout, sequence, or guarding eliminate the contact opportunity? | Prefer separation, redesign of access, passive protection, or a different task sequence before relying on limited-force operation. |
| Sharp or projecting tooling and parts | Would low arm force still permit a cut, puncture, pinch, or entanglement? | Round or remove projections where feasible, shield hazardous edges, and assess the end-effector and workpiece as part of the contact hazard. |
Power-and-force limiting does not remove hazards from sharp tools, trapped body parts, dropped loads, or nearby machinery. Speed-and-separation monitoring is only effective if the monitored zone, detection performance, robot stopping behavior, and access paths are engineered for the application. A protective stop is not a substitute for isolation during maintenance.
5. Engineer the physical layout around real spaces and reach
Distinguish operating, restricted, and safeguarded spaces
Map the robot’s operating space, including programmed motion and possible motion caused by a fault or recovery action. Map the restricted space allowed by limiting devices or the cell design. Then define the safeguarded space that protective measures control. Include the end-effector and the largest or most hazardous workpiece, not only the arm envelope.
Overlay those spaces on worker routes, material presentation, adjacent machines, storage, electrical cabinets, and emergency exits. Check positions above, below, and behind the workstation. A route that appears clear from the operator’s standing position may still allow a person to reach around a guard or become trapped between the robot and a fixed object.
Provide clearance for production and service
Workers need enough room to load parts, see the task, operate controls, and leave without passing through a moving envelope. Setup, programming, inspection, cleaning, and maintenance can require different access than production. Plan access to fixtures, sensors, cable connections, lubrication points, and lockout or energy-isolation devices without requiring a person to reach under or around the robot.
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The available sources do not establish universal workstation dimensions or separation distances. Set dimensions from the robot and tool geometry, stopping performance, workpiece variants, worker anthropometry, local codes, and a site-specific ergonomic and risk evaluation.
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Design visibility and ergonomics together
Protective devices should address hazards without creating new trip, pinch, glare, or access problems. Operators should see the workpiece, tool point, status indicators, and entry points from normal positions. If a guard blocks a required view, provide an engineered alternative such as a safe camera view or a changed task position rather than encouraging workers to bypass the guard.
Keep handoffs intuitive. Present parts at a consistent height and orientation, avoid blocked reach paths, and place controls where a worker can operate them without entering the hazard zone. Confirm the design with the people who will perform the task; ergonomic suitability is specific to the process and worker population.
6. Design setup, programming, maintenance, and abnormal work deliberately
Many robot incidents occur during non-routine activities such as programming, maintenance, testing, setup, or adjustment, according to OSHA’s robotics overview. Treat these states as primary design cases, not exceptions.
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Setup and changeover
- Define how energy is controlled before a person changes a fixture, gripper, or workpiece format.
- Provide a controlled setup mode with clearly defined speed, enabling controls, and stopping behavior where appropriate.
- Prevent automatic restart when a guard is closed or a sensor becomes clear unless the assessed control sequence specifically requires and safely manages it.
- Provide access to adjustment points without placing the worker between the robot and a fixed hazard.
Programming and teaching
- Specify who may teach or edit motion and how the program version is identified.
- Make the selected mode, enabled device, speed limit, and robot status visible.
- Test new paths with the smallest practical speed and payload, while observing the complete tool and workpiece envelope.
- Verify that a recovery path cannot sweep through a person, adjacent machine, or stored material.
Maintenance and troubleshooting
- Provide lockout or other required energy-control procedures for electrical, pneumatic, hydraulic, gravity, and stored mechanical energy.
- Identify tasks that require entry into safeguarded space and specify isolation, verification, and release steps.
- Plan how a dropped or jammed part is removed without reaching into an unverified hazard.
- Maintain records of safety-device tests, repairs, program changes, and return-to-service checks.
Abnormal conditions and emergencies
Define what happens after a protective stop, power interruption, communication fault, sensor failure, loss of a safety function, or collision. The safe state may require stopping motion, removing energy, restricting access, or calling qualified personnel; it should not be left to improvisation. Make the reset location, emergency-stop response, evacuation route, and restart authorization clear to everyone who can enter the area.
7. Validate the integrated application before handover
Validation asks whether the chosen robot, end-effector, workpiece, layout, safeguards, controls, and procedures work together as designed. Test the actual production variants and foreseeable faults, not only an empty robot running a demonstration program.
Commissioning checks
- Confirm the approved cell boundary, operating and restricted spaces, access points, and worker routes.
- Verify every end-effector, fixture, workpiece variant, payload, and programmed motion.
- Test interlocks, presence sensing, monitored stops, protective stops, speed and force limits, emergency stops, and restart prevention under the conditions specified for the application.
- Test access from every normal and foreseeable approach, including reaching around, under, or over protective devices.
- Introduce representative faults: a missing part, misaligned part, blocked sensor, communication fault, protective-device interruption, and a stopped cycle requiring recovery.
- Check that a change in tool, workpiece, program, or surrounding equipment triggers the intended review and control process.
- Observe operators, setup personnel, programmers, and maintenance workers performing their procedures; correct awkward reaches, blocked views, ambiguous states, and unsafe workarounds.
- Document test conditions, results, unresolved restrictions, training requirements, and the person authorized to release the cell.
ISO 10218-2:2025 places integration in a lifecycle that includes design, commissioning, operation, maintenance, decommissioning, and disposal. Plan the records and responsibilities at commissioning so that the cell remains controlled after production starts.
8. Use the current standards at the right level
The 2025 editions separate robot-level requirements from application integration. ISO/TS 15066 remains the collaborative-operation supplement, but none of these documents replaces a site-specific risk assessment or applicable law.
| Document | Current edition and date | What it addresses |
|---|---|---|
| ISO 10218-1 | Edition 3, published February 2025 | Safety requirements for industrial robots as machines. ISO identifies integration and application requirements in Part 2. |
| ISO 10218-2 | Edition 2, published February 2025 | Integration of industrial robot applications and cells, including design, commissioning, operation, maintenance, decommissioning, and disposal. |
| ISO/TS 15066 | Edition 1, published February 2016; reviewed and confirmed in 2022 | Collaborative industrial robot systems and work environments; supplements ISO 10218-1 and ISO 10218-2. |
OSHA’s robotics standards index lists national consensus standards and technical reports for topics such as robot integration, collaborative safety, task-based risk assessment, end-effectors, and manual load/unload stations. OSHA explicitly says the listed consensus standards are not OSHA regulations. OSHA’s robotics overview also says there are currently no specific OSHA standards for the robotics industry; that does not eliminate other occupational-safety duties or jurisdiction-specific requirements.
Determine which legal and regulatory requirements apply to the facility, workers, equipment, and location. Use the standards as engineering references at the level relevant to the design, and obtain the complete standards when the project requires their detailed requirements. Possessing a standard is not evidence that the cell complies.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.9. Compare redesign options with the same evidence
When several layouts or collaboration concepts are plausible, evaluate each against identical task scenarios, workpiece variants, and fault cases. A concept that looks compact may create difficult maintenance access; a generous layout may increase travel or obscure visibility.
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- Enhanced Wiring & Performance – Compared to the SO-ARM100, the SO-ARM101 features improved wiring to prevent disconnection at joint 3 and eliminates range-of-motion limitations. The leader arm uses optimized gear ratio motors for smoother performance—no external gearboxes required
- Real-Time Leader-Follower Functionality – New real-time tracking allows the leader arm to follow the follower arm, enabling human intervention and correction during reinforcement learning (RL) training. Perfect for hands-on AI robotics development and research
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| Comparison axis | Questions to answer | Evidence to collect |
|---|---|---|
| Task and workflow fit | Can the person and robot complete their assigned steps without awkward handoffs, blocked work, or unnecessary simultaneous access? | Observed task sequence, reach paths, cycle-state diagrams, and worker feedback. |
| Access and ergonomics | Can workers reach the task safely and intuitively? Is there clearance for operation, setup, and maintenance? | Ergonomic review, access trials, visibility checks, and maintenance mock-ups. |
| Robot and workpiece space | Where are operating, restricted, and safeguarded spaces? Do they overlap other machines or worker routes? | Envelope drawings for every tool and workpiece variant, including abnormal recovery. |
| Contact and safety functions | Is contact expected while moving? Are the selected power-and-force or speed-and-separation capabilities suitable for that scenario? | Risk assessment, stopping tests, tool and part hazard analysis, and safety-function verification. |
| Safeguarding and visibility | Do protective devices control the hazard without creating new hazards or hiding the work? | Approach tests, status-indication review, emergency access checks, and operator trials. |
| Change and lifecycle management | How will a new part, tool, process, maintenance action, or environmental change trigger reassessment? | Change-control procedure, validation records, training plan, and ownership assignments. |
This framework helps compare alternatives; it does not supply universal force limits, speed values, scanner distances, or workstation dimensions. Those values depend on the actual application and its assessment.
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Buying a “collaborative” arm and adding it to the old station
Why it fails: The old fixture, sharp tooling, access path, or neighboring machine may create hazards outside the robot’s original assumptions.
Correction: Re-map the complete cell, including tool and workpiece envelopes, then validate the integrated design.
Designing only for automatic production
Why it fails: Workers are most likely to enter or reach into the cell during setup, programming, jam clearing, testing, and maintenance.
Correction: Create separate procedures and safeguards for every lifecycle state and test them with the people who perform the work.
Using a standard as a compliance certificate
Why it fails: Standards have defined scopes and are not a substitute for local legal requirements or an application risk assessment.
Correction: Apply ISO 10218-1 at the robot level, ISO 10218-2 to integration and lifecycle work, and ISO/TS 15066 to collaborative-operation considerations, while checking jurisdiction-specific obligations.
Assuming low force means no injury mechanism
Why it fails: Edges, projections, pinch points, gravity, stored energy, and the workpiece can remain hazardous.
Correction: Analyze contact with every object and use passive measures such as rounding edges or removing projections where feasible, together with engineered safeguarding.
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Why it fails: A cell can work in simulation but force workers to reach around guards, stand between hazards, or cross the robot envelope during service.
Correction: Draw real approach paths, provide service access and isolation points, and observe the work in a physical trial before release.
Quick Recap
A practical redesign sequence
- Define the process, workpiece variants, production states, and facility constraints.
- List every worker role and every route that can overlap the cell.
- Map normal, setup, programming, maintenance, recovery, and emergency tasks.
- Perform a risk assessment with worker participation before choosing collaboration functions.
- Decide whether shared space or simultaneous work on the same workpiece is necessary.
- Develop separated and collaborative concepts, then compare them using the same task and fault scenarios.
- Lay out operating, restricted, and safeguarded spaces, including tool and workpiece envelopes.
- Design controls, protective devices, access, visibility, ergonomics, energy isolation, and procedures as one system.
- Validate every variant and foreseeable abnormal condition at site acceptance.
- Train authorized personnel, document the validated configuration, and require reassessment after changes.
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