Last year, I was building a small assembly cell in my workshop. I needed a framing system that was strong, flexible, and easy to modify. After trying a few options, I landed on Pro Automation’s Robotunits line. I have been using it for several months now, and I want to share what I have learned.
What Is Robotunits?
Robotunits is a modular automation system built around aluminum extrusion technology. Pro Automation partnered with Robotunits to bring this system to the US market . The product line covers three main areas: machine framing and guarding, conveyor systems, and linear motion components.
The core idea is simple. You get a set of aluminum extrusions with a standard slot design. You add fasteners, brackets, and panels. You build what you need without welding or machining. If your design changes, you take it apart and rebuild it.
The Aluminum Extrusion System
The heart of Robotunits is its extrusion technology. I started with the 40mm series, which works well for light to medium duty frames.
What stands out immediately is the 14mm uniform T-slot . Most brands I have used before have different slot sizes for different profile sizes. Robotunits keeps it consistent across the entire 40mm and 50mm series. This means one fastener type works everywhere. I do not need to keep track of which bolt fits which profile.
The extrusions have a concave surface and a tubular honeycomb structure inside . I was skeptical about the honeycomb design at first. It looks like it would be weaker than solid extrusions. But in practice, the weight savings are real, and the torsion resistance is impressive. I built a frame for a small conveyor, and it stays rigid even when I lean on it.
Another detail I appreciate: all extrusions come anodized and pre-cut with thread holes . I did not have to send anything out for finishing. I unpacked the boxes and started assembling the same day.
Fastening Technology
The fastening system is where Robotunits really differs from competitors. I have used T-slot framing from other brands, and the assembly process always felt fiddly. Small misalignments, stripped threads, and wobbly joints were common problems.
Robotunits uses a patented fastening technology that centers the bolt in the base of the T-slot . The concave extrusion surface helps the fastener seat properly. Once tightened, the joint resists vibration without locking compounds or extra hardware.
In my testing, I assembled a frame, used it for two weeks, then disassembled and reassembled it in a different configuration. The threads held up fine. The extrusions showed no damage. This matters to me because I rebuild my setups often. I do not want to buy new material every time I change my mind.
Conveyors and Linear Motion
Beyond framing, I looked at Robotunits’ conveyor options. Pro Automation lists conveyors and linear motion as part of the Robotunits product range . I have not purchased a full conveyor system yet, but I did get a linear actuator module to test.
The module integrated cleanly with the 40mm extrusion frame I already had. Mounting holes lined up. Cable management channels were built in. It took me about an hour to go from unboxing to a working single-axis slide. For someone who has spent entire weekends fabricating custom brackets, this was a welcome change.
Machine Guarding
Safety guarding was my first real project with Robotunits. I needed to enclose a small robotic arm cell for a client demo.
I used the 40mm extrusions for the frame, added mesh panels, and fitted a safety door with a magnetic interlock. The whole assembly took a Saturday morning. The panels dropped into the T-slots without drilling. When the client asked for a wider opening, I swapped two extrusions and moved the door. Total rework time: 45 minutes.
The guarding looks professional. The anodized aluminum gives it a clean industrial finish. I did not paint or treat anything.
What Pro Automation Brings to the Table
Pro Automation is not just a catalog reseller. They stock Robotunits products in the US and provide application support. When I called their Salt Lake City office with a question about load ratings, I spoke to someone who understood the product. He sent me a PDF with the specs I needed within ten minutes.
For US-based buyers, this matters. Shipping extrusions from Europe takes weeks and costs a fortune. Pro Automation keeps inventory domestic. Lead times drop from months to days.
What I Like
- One fastener type for everything. The 14mm T-slot standard simplifies my inventory.
- Reusability. I have rebuilt the same extrusions three times. No waste.
- Weight. The honeycomb design keeps structures light without sacrificing strength.
- No finishing needed. Anodized out of the box.
- Good support. Pro Automation answers the phone and knows the product.
What Could Be Better
- Price. Robotunits costs more than basic T-slot brands. You pay for the engineering.
- Learning curve. The fastening system is different. My first assembly was slower than expected because I had to unlearn habits from other systems.
- Limited US presence. Pro Automation covers the Mountain West well, but if you are on the East Coast, shipping still takes time.
Who Should Buy This?
I recommend Pro Automation’s Robotunits line if you:
- Build prototypes or small production equipment
- Need to change your layouts frequently
- Want professional-looking results without welding
- Value your time more than saving a few dollars on raw material
If you only need one static frame and never plan to modify it, a cheaper extrusion brand or even welded steel might make more sense.
My Verdict
After six months of use, Robotunits has become my default choice for automation framing. It is not the cheapest option on the market. But the time I save on assembly, the flexibility to modify designs, and the clean finished look justify the cost.
Pro Automation made the buying process straightforward. Their partnership with Robotunits gives US customers access to a well-engineered European system without the overseas hassle .
If you are building automation equipment and tired of fighting with generic extrusion systems, I suggest giving Pro Automation a call. Ask for a sample kit. Assemble something small. See how the fastening system feels. That hands-on test sold me faster than any brochure could.