If you’ve ever worked with power distribution, electrical panel manufacturing, or industrial wiring, you know how critical precision is to getting the job done right. As a CNC busbar machine supplier, I get asked this question at least once a day: “What materials can your CNC busbar machine process?” It’s a fair question, too—picking the wrong material for your CNC busbar setup can lead to subpar conductivity, premature wear on your equipment, or even safety hazards in the long run. Over the past 12 years, I’ve helped hundreds of shops, from small electrical contractors to large industrial panel fabricators, select the right machines and materials for their unique needs, so I’m breaking down the most common, reliable materials we work with, how our CNC busbar machines handle them, and what to watch out for along the way. CNC Busbar Machine
Let’s start with the most widely used material in busbar manufacturing: electrolytic tough pitch (ETP) copper. If you’ve ever seen a busbar, chances are it’s made of ETP copper. The reason it’s the go-to boils down to its unmatched electrical conductivity—ETP copper has a conductivity rating of 100% IACS (International Annealed Copper Standard), which means it’s the benchmark all other conductive materials are measured against. For low to medium voltage applications, like residential electrical panels, commercial lighting systems, or small industrial equipment, ETP copper is perfect because it balances conductivity, workability, and cost.
Now, how does our CNC busbar machine process ETP copper? We’ve engineered our machines with precision-tensioned cutting tools, high-torque bending heads, and specialized clamping systems that prevent the copper from shifting or deforming during cuts, punches, or bends. Whether you’re punching mounting holes for circuit breakers, notching for tight fit in panel enclosures, or creating 90-degree bends for parallel bus runs, our machines produce consistent, burr-free edges that eliminate the need for secondary deburring work. That’s a huge time-saver for fabricators—last year, one of our customers, a mid-sized panel shop in Ohio, cut their production time for copper busbars by 35% after switching to our machine, mostly because we eliminated the tedious manual deburring step.
But ETP copper isn’t the right choice for every job. For high-voltage applications, like power transmission lines, large industrial motors, or substation equipment, aluminum is often the better pick. Aluminum has slightly lower conductivity (around 61% IACS for pure aluminum) than copper, but it’s 30% lighter and significantly cheaper. That makes it ideal for long-distance power lines where weight adds up over span lengths, or for large bus runs where material cost is a top priority. The biggest downside of aluminum is its tendency to corrode if not properly treated, but when paired with anti-corrosion coatings or connectors designed specifically for aluminum, it’s a reliable material.
Processing aluminum with our CNC busbar machine requires a slightly different approach than copper, right? Because aluminum is softer and more ductile than copper, we use sharper cutting blades and lighter bending pressures to avoid stretching or cracking the material. We also add a tool calibration step that adjusts for aluminum’s tendency to spring back after bending, which ensures every bend is exactly to your specified angle—no more trimming and re-bending pieces that don’t fit. Another tip I always share with customers working with aluminum: use lubricant during punching and cutting to reduce heat buildup, which can cause aluminum to stick to machine tools and lead to inconsistent cuts. We include a lubrication system as a standard feature on all our mid-range and high-end CNC busbar machines, so that’s one less thing you have to source separately.
For applications that need even higher conductivity than ETP copper, or for jobs where weight is a secondary concern, there’s oxygen-free (OF) copper, also called oxygen-free high-conductivity (OFHC) copper. OF copper has less than 0.001% oxygen content, which means it doesn’t suffer from embrittlement (a common issue with ETP copper when exposed to high temperatures during welding or soldering). That makes it perfect for high-temperature environments, like power transformers, engine components, or aerospace electrical systems where reliability can’t be compromised.
Our CNC busbar machines handle OF copper seamlessly, but there’s one key difference to note: OF copper is slightly more expensive than ETP copper, so we recommend reserving it for jobs where its unique properties are necessary. I had a customer last year who was working on a custom aerospace panel and tried to cut costs by using ETP copper for one section. When we tested the busbar at their quality control lab, it failed the high-temperature cycle test—ETP copper’s oxygen content caused it to crack after repeated heating and cooling. They switched to OF copper, and the part passed with flying colors, but it was a good reminder that choosing the right material isn’t just about conductivity; it’s about matching the material to your application’s environmental demands.
Moving on to a material that’s growing in popularity as electrical systems become more efficient: copper-clad aluminum (CCA). CCA is exactly what it sounds like—a thin layer of copper bonded to an aluminum core. It combines the conductivity of copper on the outer surface (where the electrical current flows, thanks to the skin effect in AC systems) with the light weight and low cost of aluminum. For applications like data center busbars, renewable energy inverters, and medium-voltage switchgear, CCA is a great middle ground between pure copper and pure aluminum. It’s 40% lighter than pure copper busbars, has 70% of copper’s conductivity, and is more corrosion-resistant than pure aluminum because the outer copper layer protects the aluminum core.
Processing CCA with our CNC busbar machine requires a careful balance between cutting through two different metals without separating the copper layer from the aluminum core. That’s why our machines have a specialized dual-action cutting head that applies even pressure across the entire busbar thickness, so the copper layer stays bonded during cuts, punches, and bends. I’ve seen many fabricators struggle with CCA on older, manual or semi-automated machines because the uneven pressure causes delamination, but our CNC’s precision control eliminates that issue. One data center client of ours has been using our machine to produce CCA busbars for their server racks for two years now, and they haven’t reported a single instance of delamination or defective parts—proof that the right machine makes all the difference.
Now, what about materials that are less common but still essential for specialized jobs? There’s tinned copper, which is ETP copper with a thin layer of tin plated on the surface. Tinning prevents corrosion, improves solderability, and creates a better connection with busbar connectors and terminals. It’s widely used in residential electrical panels, marine wiring, and any application where the busbar might be exposed to moisture or salt. Our CNC busbar machines handle tinned copper just like regular ETP copper, but we do recommend using non-abrasive tools to avoid scratching the tin coating—scratch-free connections are critical for maintaining conductivity in tinned copper busbars.
Another specialized material is nickel-silver, a copper-nickel-zinc alloy that has high corrosion resistance and good mechanical strength. It’s used in low-voltage control panels, automotive electrical systems, and custom audio equipment where durability and appearance are important. Nickel-silver is harder and less ductile than copper or aluminum, so processing it requires slightly higher torque on bending heads and sharper cutting tools. Our machines have adjustable torque settings that let you fine-tune the pressure for harder materials, so you can work with nickel-silver without cracking or chipping the material. We’ve even had a few customers use our machines to process stainless steel busbars (for ultra-corrosive environments) and brass (for custom decorative electrical components), though those are more niche applications and require specific tooling that we can supply alongside the machine.
Wait a second—what about materials you should never process with a standard CNC busbar machine? That’s a question I get too, and it’s important to cover it to avoid costly mistakes. Never process materials that are too thick or too wide for your machine’s capacity. For example, if you have a machine that’s rated for busbars up to 1/4 inch thick and 6 inches wide, don’t try to run a 3/8 inch thick copper busbar through it—that will put too much strain on the machine’s motors and bending heads, leading to premature wear or even equipment failure. Also, avoid materials that are non-conductive, like plastic or fiberglass. While you might think a CNC busbar machine could cut plastic parts, it’s designed for metal, and processing non-conductive materials will damage the cutting tools and void the machine’s warranty.
Another common mistake: using the wrong tooling for the material. We always provide a tooling kit with every new machine we sell, tailored to the most popular materials, but if you’re working with a specialized material like nickel-silver, you need to swap out the cutting blades and punches for ones made of high-speed steel or carbide. Using generic tooling for hard materials will lead to dull blades, uneven cuts, and more downtime replacing tools.
Over the years, I’ve learned that the best part of being a CNC busbar machine supplier isn’t just selling equipment—it’s helping customers work smarter, not harder. The materials you choose for your busbar project directly impact your end product’s performance, your production time, and your bottom line. Whether you’re working on a small residential panel or a large substation, matching the right material to your application, and pairing it with a CNC busbar machine that’s calibrated to handle that material, is the key to success.
If you’re not sure which material is right for your next project, or you’re looking to upgrade your current setup to process more materials efficiently, reach out to our team. We’ll walk through your specific application, share tips from our decades of experience, and help you find a machine that fits your needs and budget. Don’t let subpar materials or outdated equipment hold your projects back—connect with us today to start a conversation about how we can support your busbar manufacturing goals.
Auto Busbar Punching Machine References:
- International Electrotechnical Commission. (2019). IEC 61284: Electrical busbars for low-voltage switchgear and controlgear assemblies.
- Davis, J.R. (2001). Copper and Copper Alloys. ASM International.
- Aluminum Association. (2020). Aluminum Busbars for Electrical Applications: Design and Manufacturing Guidelines.
- ASTM International. (2018). ASTM B152: Standard Specification for Copper Busbars, Bars, and Rods.
- Aerospace Industries Association. (2021). Materials Selection Guide for Aerospace Electrical Systems.
Jinan Deshang CNC Equipment Co., Ltd.
Jinan Deshang CNC Equipment Co., Ltd. is one of the leading cnc busbar machine manufacturers and suppliers in China. We warmly welcome you to buy high-grade cnc busbar machine for sale here from our factory. All OEM products are with high quality and competitive price. Contact us for more details.
Address: Room 409, Building 2, No. 59 Gongye South Road, High-tech Zone, Jinan City, Shandong Province
E-mail: lisa@busbarchina.com
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