Guide · 10 min read
Cobots vs. industrial robots — choosing the right architecture
The first robot a factory installs sets the tone for the next decade of automation. Pick a collaborative robot when your bottleneck is small batches, frequent changeovers and shared workspace with operators. Pick a fenced industrial robot when cycle time, payload or reach dominate. This guide walks through the four decision factors that matter most.
1. Safety architecture
Industrial robots are designed to operate at full speed inside a guarded cell — physical fencing, light curtains and interlocked doors keep humans out. The robot itself has no intrinsic safety; the cell does. That makes them fast and powerful, but every load, unload or inspection step that needs a human requires the cell to stop.
Collaborative robots use power and force limiting (ISO/TS 15066). Joint torque sensors detect contact and halt the arm before injury. A correctly risk-assessed cobot application can run without fencing, with operators reaching in to load parts while the robot continues working on the previous one. The trade-off is speed: cobots run at 250–1000 mm/s in collaborative mode, versus 2000+ mm/s for industrial arms.
2. Footprint and floor space
A fenced industrial cell typically claims 6–12 m² once safety distances, guarding and operator access are included. A cobot cell with the same arm reach can fit in 2–4 m², often on a mobile base that rolls between two machines. For SMEs with crowded shop floors, this is frequently the deciding factor.
3. Integration speed
A traditional industrial cell — robot, PLC, safety controller, fencing, HMI — takes 12–20 weeks from order to production. A cobot cell with a standard end-of-arm tool, a template program and an off-the-shelf base often runs in 2–6 weeks. Cobots also expose high-level scripting (URScript, RAPID Lean, Wandelscript) that lets shop-floor staff re-task the robot for a new part in hours rather than calling an integrator.
4. Payload, reach and cycle time
This is where industrial robots still dominate. A six-axis arm like the ABB IRB 6700 handles 150–300 kg at 3.2 m reach with sub-second cycle times. Cobots top out around 35 kg payload and 1.8 m reach, with cycles 2–4× slower in collaborative mode. If the part is heavy, the takt is tight, or the process is genuinely lights-out, fencing pays for itself fast.
Side-by-side
| Factor | Cobot | Industrial robot |
|---|---|---|
| Safety | Power & force limiting, no fence (after risk assessment) | Hard guarding, light curtains, interlocks |
| Footprint | 2–4 m² | 6–12 m² |
| Lead time | 2–6 weeks | 12–20 weeks |
| Payload | 3–35 kg | 5–2300 kg |
| Reach | 500–1800 mm | 500–4200 mm |
| Cycle speed | Slower in collaborative mode | Full industrial speed |
| Capex | €35k–€90k turnkey cell | €120k–€400k turnkey cell |
| Re-tasking | Operator-friendly, hours | Integrator, days |
A simple decision rule
If your part is under 15 kg, your batches are under 500 pieces and a human still needs to interact with the cell several times a shift, a cobot is almost always the right answer. If your part is heavy, your line runs 24/7 and the cell can be fully enclosed, a fenced industrial robot will pay back faster despite the higher capex.
The middle ground — medium payload, mixed product families, two-shift operation — is where a feasibility study matters. We size cycle time, simulate the cell and compare both architectures against your real product mix before recommending a path.