Automating Machine Tending: Cobots for CNC, Presses, and Injection Molding
Machine tending is the most common cobot entry point after palletizing: the cobot loads and unloads a CNC machine, press, or injection molding machine while the skilled worker looks after several machines in parallel. Here is how it works, what it costs, and how it pays off.
A CNC machine that only runs while someone stands next to it inserting parts is wasting capacity. This is exactly where automated machine tending comes in, and it is one of the most economical cobot entry points of all.
What machine tending with a cobot means
The cobot takes over loading and unloading workpieces into a machine: grip the raw part, place it in the machine, close the door, start, remove the finished part, set it down, next raw part. The skilled worker no longer has to stand by the machine and can instead look after several machines in parallel or do more demanding work. That is the real gain.
Which machines are suitable
- CNC lathes and milling machines: the classic case, often with long machining times per part.
- Presses and punching machines: ergonomically taxing and therefore ideal to relieve.
- Injection molding machines: remove parts, set them down, post-process if needed.
- Grinding, testing, and assembly machines.
The prerequisites are an accessible working area and a workpiece that can be gripped reliably. Ideally, the machine can open its door automatically and be started by a signal.
How a project runs
- Collect data: machine type, workpiece weight and shape, cycle time, accessibility, existing interfaces.
- Describe the requirement: what the cell needs to deliver. This makes quotes comparable.
- Clarify the gripping concept: often the tricky part, especially with changing parts.
- Choose an integrator with experience on your machine type.
- Installation, connection to the machine, commissioning, and training.
What it costs and when it pays off
A machine tending cell typically falls in the usual range of roughly €50,000 to €150,000 depending on workpiece, gripper, and cycle time (details: TCO of a robot cell). The economic lever is machine runtime: if the cobot keeps a machine running through breaks, overnight, or for a third shift, output rises significantly without additional staff. That is exactly what makes machine tending so attractive.
In short
Machine tending turns a machine that is tied to an operator into one that runs longer and more autonomously. Clarify the gripper and the machine interface early, choose an experienced integrator, and the ROI follows almost automatically from the additional runtime.
Frequently asked questions
What is machine tending with a cobot?
In automated machine tending, a cobot takes over loading and unloading workpieces into a production machine, such as a CNC mill, a press, or an injection molding machine. This frees up the operator, who can then look after several machines at the same time.
Which machines can be tended by a cobot?
Very commonly CNC lathes and milling machines, presses, injection molding machines, grinding and testing machines. The prerequisites are an accessible working area and a workpiece that can be gripped reliably.
When does automated machine tending pay off?
Especially when a machine runs across several shifts and loading and unloading would otherwise tie up a skilled worker. A cobot often enables operation through breaks or an unmanned third shift, which speeds up payback considerably.
What information does the integrator need?
Above all: machine type, weight and shape of the workpiece, target cycle time, accessibility of the working area, and whether the machine has an interface for automatic door opening and starting. With this information, a cell can be properly dimensioned.
Prices are indicative values (as of 2026). Your specific case depends on the machine, workpiece weight, cycle time, and gripping concept.