Run the Door-and-Fixture Test
Machine tending means loading and unloading a CNC, press, moulding machine, or test station. It is the usual first automation project because the motion is repetitive and the payback is easy to see.
The Bot Scout door-and-fixture test asks two questions before any vendor visit: can the robot physically reach through the machine door at the required orientation, and does the part arrive in a fixture or is an operator quietly correcting it today. Those two answers predict the project outcome more reliably than any specification.
Door access is the constraint people underestimate. Reaching into an enclosure means an approach angle, clearance for the tool and cabling, and often a machine interface for automatic door opening. Arms from FANUC, ABB Robotics, and Universal Robots all publish families sized for this work, and the differentiator is envelope rather than brand.
| Cell element | What to confirm | Who supplies it | Failure if skipped |
|---|---|---|---|
| Machine door | Automatic opening and robot clearance | Machine OEM or integrator | Robot cannot enter without a person |
| Machine interface | Signal handshake for cycle start and complete | Integrator | Robot and machine never synchronise |
| Part presentation | Fixture, tray, or known orientation | Integrator or in-house | Gripper misses inconsistently placed parts |
| Gripper | Grip on raw and finished part states | Integrator | Second gripper needed mid-project |
| Chip and coolant management | Cleaning before regrip or measurement | In-house | Slippage and measurement error |
| Restart procedure | Who clears a fault, per shift | Production | Cell idle until one person arrives |
The Part Changes Everything
A raw part and a finished part often need different grip strategies, and a part covered in coolant or chips behaves differently again. A single gripper that handles both states is the exception rather than the rule.
Changeover is the requirement most often left out of the specification. A cell that runs one part well and takes half a shift to switch has moved the bottleneck rather than removed it — the same pattern described in the robotics in manufacturing guide.
Ask what happens to an out-of-tolerance part. A cell with no reject path will either jam or pass bad parts downstream, and both outcomes cost more than the automation saved.
- Confirm automatic door opening and the machine signal handshake.
- Design part presentation before selecting the robot.
- Plan for grip on both raw and finished part states.
- Specify changeover time as a hard requirement.
- Define the reject path for out-of-tolerance parts.
Safety and Who Runs the Cell
Safety attaches to the whole application. ISO 10218-1:2025 sets robot safety requirements, ISO/TS 15066:2016 supplements them for collaborative work, and OSHA notes that many incidents occur during setup, programming, and maintenance.
Name the person who restarts the cell after a fault on every shift, and train more than one of them. A machine tending cell that only one operator can recover will be idle whenever that person is not on site.
For the arm specification itself, use the robot arms guide, and for the full budget see the robot arm price guide.
Bottom Line
Machine tending works when the door, the machine interface, and part presentation are solved before the robot is chosen. Specify changeover and the reject path, and train more than one person to recover the cell.
Confirm door clearance and how the part arrives before asking a vendor for a robot recommendation.
FAQs
What is machine tending in robotics?
Loading and unloading a machine such as a CNC, press, or moulding machine. It is a common first automation project because the motion is repetitive and the payback is easy to measure.
What is the hardest part of a machine tending project?
Usually door access and part presentation. The robot must reach through the machine door at the right orientation, and the part must arrive consistently rather than being corrected by an operator.
Do I need one gripper or two for machine tending?
Raw and finished parts often need different grip strategies, and coolant or chips change the grip again. Plan for the possibility of a dual gripper rather than discovering it during commissioning.
Does a machine tending cell need a safety assessment?
Yes. Safety is assessed per application, including the tool, the part, and access during programming and maintenance, which is when many robot incidents occur.