When you're shopping for industrial robotics and cobots, the biggest question isn't which robot is best overall - it's which component you really need right now. Do you need a complete arm with a controller, a standalone controller for a robot you already have, a dedicated weld control unit, or a sensor that makes an arm feel the world around it? These four used components span that range, from a $749.99 weld controller to a $7,999.99 6-axis robot arm.
Quick take
If your immediate need is a full motion system, the Nachi MZ07 is the only unit in this set that includes both the arm and a controller with teach pendant. If you already have an RX90 arm and need its CS7 controller, the Staubli RX90 CS7 is the only controller here that matches that model line. If your arm needs to sense contact, the ATI Mini45 is a compact force/torque sensor. And if you need automated weld control, the Miller M 043268 is the dedicated process controller.
Listed price comparison
| Component | Price | Relative price |
|---|---|---|
| Miller Automatic M 043268 | $749.99 | |
| ATI Industrial Automation Mini45 | $1,395.00 | |
| Staubli RX90 CS7 | $2,499.99 | |
| Nachi MZ07 | $7,999.99 |
The price spread runs from $749.99 to $7,999.99, a difference of $7,250 between the entry-level weld controller and the full 6-axis arm package.
Decision matrix
| Component | Best for | Keep in mind |
|---|---|---|
| Miller M 043268 | Automated weld control | Not a motion system; needs a robot arm alongside it |
| ATI Mini45 | Force/torque sensing for assembly, deburring, research | A sensor only; needs a compatible arm and controller |
| Staubli RX90 CS7 | Existing RX90 setup needing a CS7 controller | 1997 unit with a dent and missing key; plan for servicing |
| Nachi MZ07 | Complete 6-axis arm with controller and teach pendant | Highest price in the group; used condition |
Miller Automatic M 043268 Microprocessor Weld Control Automated Weld Controller - $749.99
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Starting at the bottom of the price range, this Miller Electric unit is a microprocessor-based automated weld controller. It's the only product here purpose-built for governing a welding process, so if your cell already has a robot arm but needs a dedicated weld control layer, this is the piece that fits. It's a used unit from an industrial automation supplier, and at 16.675 lb with a 35 x 46 x 46-inch footprint, it has a real physical presence. The reason to choose it: it targets a specific process that the other components don't address. The limitation: it doesn't include any arm or teach pendant, so you'll need to integrate it with an existing robot and welding power source to make it useful.
Nachi MZ07 6-Axis Industrial Robot Arm with CFD Controller and Teach Pendant - $7,999.99
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The notable thing about the Nachi MZ07 is that it's the only item in this comparison sold as a complete robotic arm assembly. The 6-axis arm comes with a CFD controller and teach pendant, and the specs list a 7 kg payload and 723 mm reach. That makes it the natural choice if you're building a new cell from scratch or replacing an entire motion unit. At $7,999.99, it's also the highest-priced component here, so the main limitation is budget: you're paying for full motion capability even if your task only needs a controller or sensor. It is used, and it carries the usual caveats about duty cycle and prior service history, but it is the only ready-to-move option among the four.
Staubli RX90 CS7 6-Axis Industrial Robot Arm Controller - $2,499.99
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This is a used controller unit from the Staubli RX90 line, and it's listed with the CS7 control type. If you have an RX90 arm that needs a compatible controller, this is the only item here aimed at that specific pairing. The unit dates to 1997, and a dent on the corner plus the missing key show its age. The reason to consider it is compatibility with an existing RX90 robot rather than generic motion control. The limitation is that it's only the controller, not the arm, and its physical condition means you should factor in servicing before it takes over production.
ATI Industrial Automation Mini45 - $1,395.00
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The ATI Mini45 is a force/torque sensor rather than a robot arm or controller. It simultaneously measures forces and torques in X, Y, and Z axes, which allows a robot to detect contact, load, and tool interaction. This used unit was removed from working automation and research equipment and is described as functional with minor cosmetic wear, no cracks, bends, or structural damage, and an integrated cable. The reason to choose it: it gives your existing arm a sense of touch for tasks like assembly, deburring, or research. The limitation: it's a component, not a system, so you still need a compatible arm and controller to interpret the sensor data.
Final recommendation by use case
- Need a complete 6-axis arm with controller and teach pendant? Choose the Nachi MZ07.
- Need a controller for an existing RX90 arm? Choose the Staubli RX90 CS7.
- Need force/torque sensing on an existing arm? Choose the ATI Mini45.
- Need automated weld control? Choose the Miller M 043268.
