7th Axis RTUs

Robot Transfer Units

From packaging to automotive manufacturing, 7th axis robot transfer units (RTU) are picking up speed in many industries. These systems combine a linear actuator with a six-axis articulated arm or collaborative robot, creating a 7th axis of movement. This additional axis enables the robot to tend to multiple workstations or machines across a wider area of the factory floor, offering many advantages over stationary robotic setups.

The Many Benefits of RTUs

  • High throughput. RTU systems eliminate the need to reposition multiple robots and workpieces, maximizing uptime. They can also transition quickly from one task to another simply by moving along the track, maintaining a steady work flow.
  • Greater flexibility and safety. RTUs can accommodate floor, elevated and inverted mounting configurations, supporting more flexible factory layouts and enabling the system to be set up away from workers to boost safety.
  • An ability to cover larger work areas. With the 7th axis, a robot can cover a lot of ground on the factory floor in order to perform multiple tasks.
  • Better cost efficiency. By moving along a track to different workstations, a single robot can perform the work of many stationary robots without having to invest in additional costly robotic arm systems.
  • Ease of integration. Many RTUs are compatible with a wide range of robot models, allowing manufacturers to upgrade their systems without an extensive overhaul of equipment.

The Unique Advantages of ServoBelt™

The conventional design method for RTUs involves mounting the robot on a platform that runs along a linear track. You must also choose between a belt drive, which offers inexpensive but low fidelity motion for a single carriage, and a rack and pinion drive, which can handle higher payloads but is more costly.

Redefining this classic belt drive approach, our ServoBelt™ Linear Drive supports unique RTU capabilities — but without the cost and over-engineering pitfalls of traditional 7th-axis designs.

Multiple, independently controlled carriages on the same axis. A single ServoBelt™ Linear axis can support multiple, independently controlled carriages, enabling us to design RTU systems with multiple articulated robots and cobots running on the same motion axis.

Unlimited travel lengths. Due to a unique splicing method, ServoBelt™ Linear supports designs with unlimited travel lengths, enabling us to engineer very long RTU axes with multiple robots. This limitless scalability also avoids the performance and commissioning difficulties that can arise in long-travel applications with other motion technologies.

Avoiding the pitfalls of over-engineering. Our RTU systems are based on standard, off-the-shelf ServoBelt™ Linear building blocks, which enables us to minimize costs and meet aggressive lead times compared to traditional, over-engineered RTU systems.

Common RTU Applications

  • Aerospace — composite layup and drilling.
  • Automotive — drilling, welding, material handling and painting.
  • Consumer goods — moving goods between different processing stations.
  • Machine tools — moving castings or tending to injection molding machines.
  • Logistics and packaging — palletizing, loading/unloading and transporting products.


Turnkey Transfer Robot


Engineered Solutions V2

We can combine our standard motion stages into unique, higher-level automation systems.

Think of us as an extension of your engineering department.

Using our standard linear and rotary positioning stages as building blocks, we can create unique, cost-effective automation solutions that meet your application’s requirements. These engineered systems are larger and more complex than our standalone motion stages and incorporate controls, critical safety features and custom components—all delivered as one turnkey package.

From gantry-mounted electromechanical assemblies, to cartesian robots with extended travel lengths, our engineered solutions are tailored to your needs. While our standalone stages must fit within a predefined physical space and tie into your machine’s motion control system, these larger turnkey systems free us up to optimize all aspects of assembly and controls integration.

Featured Systems

Long-Travel Transfer Robot

Used in an agricultural packaging plant, this long-travel Cartesian robot has a travel length over 50-ft and is based entirely on our ServoBelt™ Linear Heavy linear stages. To deliver sheets of corrugated cardboard into four tray-forming machines, The robot rides over the top of the tray formers, which turn out up to 35 trays per minute. This turnkey system included controls development and custom end-of-arm tooling capable of handling 50-kg payloads.

Specialized CNC Mill

Specialized CNC Mill

Built to machine precision parts for a biomedical application, this custom CNC milling unit is built around our ServoBelt Rotary stages, whose smooth motion eliminates the chatter you would expect from linear ball screw actuators. The project included the development of a specialized control system that position the workpiece and tool using polar coordinates.

Solar Cell Cartesian System

Solar Cell Cartesian System

Using our linear stages as the foundation, we engineered an x-y-z cartesian system for an application that measures solar cell efficiency. Our design addressed a number of challenging customer requirements—as the test system is fully enclosed, includes very bright LED modules and incorporates numerous electrical and cooling lines.

Vertical Gantry With Rotary

Vertical Gantry with Rotary

Engineered for a test and measurement application, our vertical gantry system incorporates ServoBelt Linear Medium stages with two different chassis sizes, as well as a ServoBelt Rotary 100 unit that provides an additional rotational axis at the end of the secondary horizontal axis. This 3 x 2.8-meter system avoids the pitfalls associated with traditional H-shaped gantry designs, including bridge deflection, positioning errors and high costs.

Your Advantages

Using our standard linear and rotary stages as automation building blocks has its benefits—especially compared to costly, more complex robotic systems.

  • Faster time to market. Combining and extending our ServoBelt™ Linear series and other standard motion stages can shave weeks or even months off the development time of a complex machine.
  • Lower costs. Our engineered solutions integrate commercial off the shelf (COTS) components wherever possible to keep your costs down. With full control over safety, assembly and controls integration, we also remove unnecessary layers and materials—frame extrusions, for example—which cuts down on labor and your overall bill of materials. Cartesian systems created from our ServoBelt and LowBoy Linear Stages are also a more capable, less costly alternative to 6-axis and SCARA robotic systems.
  • Heavier payloads. Our turnkey solutions move heavy payloads at a fraction of the cost of other robotic systems. In one case example, our ServoBelt Linear cartesian robot replaced four SCARA robots on an agricultural packaging machine—easily meeting the 50-kg payload requirements at a quarter of the price.
  • Unlimited sizes. Ideal for large-scale systems, our ServoBelt Linear series supports unlimited travel lengths—thanks to a unique splicing methodology that lets us join multiple sections of the chassis. A single axis also supports multiple carriages with independent motion—making it easy to create cartesian motion systems, gantry robots and other multi-axis configurations.
  • Enhanced safety. Combining our linear and rotary stages into higher-level systems allows us to integrate light curtains, e-stops and other critical safety components. These assemblies are also safer by design—occupying spaces your operators wouldn’t need to enter.
  • Custom components. Our engineered solutions typically involve custom design engineering work at the component level. If your assembly requires specialized end-of-arm tooling, for example, we’re ready to hit the drawing board.

 Motors


  • AB
  • Allied Motion
  • Bosch
  • Control Techniques
  • Infranor
  • Kollmorgen
  • Moog Animatics
  • Parker Hannifin
  • SANYO DENKI
  • Teknic
  • Yaskawa

 Drives and Controls


  • Bosch Rexroth
  • ModuSystems
  • Omron Delta Tau
  • Teknic

Get A Custom Quote


Terms and Conditions

General Terms and Conditions of Sale

Warranty

Seller warrants products furnished shall be free from defects due to defects in materials, workmanship, design or component failure for a period of twelve (12) months from the date of shipment from Sellers facility, unless otherwise agreed upon.

Seller does not warrant and will not be liable for a defect or failure caused by Buyer furnished or specified goods. Any warranty applicable to such Buyer furnished or specified items will be limited solely to the warranty, if any, extended by the original manufacturer or vendor directly to Buyer. Seller does not warrant the compatibility of its’ Products with the components of other manufactures, or Buyers application use, except to the extent detailed in Seller’s published specifications or written quotation to Buyer.

Buyer shall notify the Seller in writing of any obvious defects within fifteen (15) business days from the date of receipt of products at Buyers facility. Buyer will notify the Seller of any non-obvious defects within fifteen (15) business days from the date of discovery.

Seller upon written notification of products found to be potentially subject to a Warranty Claim will issue a Return of Material Authorization (RMA). Buyer will return the products for repair or replacement at the option of the Seller. Seller will repair or replace products within a maximum of thirty (30) calendar days from receipt at Sellers facility.

Products that have become defective because of misuse, neglect, improper installation, operation, maintenance, repair alteration or modification by other than Seller shall not be subject to warranty replacement.

Buyer shall be responsible for freight charges for the return of any products to Seller and shall reference the Sellers’ RMA number on all shipping documents. Seller will be responsible for freight charges for the return of repaired products to Buyer.

Components replaced or repaired under warranty are only warranted for the remaining original warranty period.

Seller will not be liable for any business interruption or loss of profit, or for any other form of incidental, indirect or consequential damages of any kind. Warranty liabilities shall be limited and shall not exceed the total value of the total purchase order(s) issued to Seller by Buyer.

General

Seller shall mean Bell-Everman, Inc and Buyer shall mean any person or Corporation who accepts a quotation from the Seller for the purchase of goods or services. Alternative conditions or changes to the conditions requested by the Buyer are not accepted unless expressly agreed to and confirmed in writing by the Seller.

Seller rejects other terms and conditions that may be proposed or appear on Buyers’ purchase order that are in addition to or are otherwise not consistent with the terms and conditions defined below.

Purchases made from appointed distributors or independent resellers may be subject to terms and conditions as separately established by each distributor or reseller but will in no event be binding upon Seller unless expressly agreed to in writing by Seller.

Prices

All prices published by Seller are subject to change without notice. Seller will confirm the acceptance by specific quotation. Publications including any website listings are not specific offers to sell and are maintained only as a source of general information. Quoted prices do not include sales, use, excise, customs or value added taxes (VAT). Quotations are subject to confirmation and are non-binding until confirmed by Seller.

Payment Terms

Payment for Buyers with approved credit shall be Net thirty (30) days from the date on the invoice. Seller reserves the ongoing right to monitor and change credit terms, and suspend further performance in the event payment is not made when due. Interest charges of 1.0% per month (subject to applicable law) will be added to unpaid amounts due where appropriate. No payment by offset is permitted.

Delivery

All quotes shall be assumed to include Seller’s standard shipping terms: Free on Board, (FOB) Goleta, California.

Special packaging must be agreed to in writing. Buyer specified packing or marking may be subject to additional charges not otherwise included in the price of the products.

Acknowledged, planned shipping dates are good faith estimates. Seller disclaims all liability for late delivery. When requested by Buyer and approved by Seller prepaid shipping will be allowed and invoiced as a separate line item on the invoice or billed separately.

Returns

No product shall be returned without the Seller’s written permission. Approved non-warranty returns are subject to a 25% restocking fee.

Return Materials Authorizations (RMA) are required for all warranty returns and the RMA number must be shown on all shipping documents. All Products returned must be properly packed and the goods must be shipped freight prepaid.

Limitation of Liability

Seller shall not be liable for any indirect or consequential damages of any kind. Seller’s maximum cumulative liability will not exceed the Buyer’s price of the products giving rise to the claim or liability. The Seller shall not be liable for damages caused by the improper installation, use, alteration, repair or operation of the Seller’s products.

Indemnification

Seller will defend any suit or proceeding instituted against Buyer arising out of a claim that the design or construction of the Seller’s Products sold infringes any patent, copyright or trademark, provided that the Buyer promptly notifies Seller in writing of any such claim or suit, and Buyer gives Seller the sole right to defend, settle and control the defense of the suit or proceeding and provides all necessary information and assistance for such defense and Buyer takes no position adverse to Seller in connection with this proceeding.

Products supplied to a Buyer’s specification shall require that the Buyer assume all responsibility for, and shall indemnify and hold Seller harmless from any liability from a charge or allegation that such product infringes on any patent, copyright or trademark.

Force Majeure

In the event of any Buyer claimed loss, damage, delay or failure to perform due to causes beyond the reasonable control of the Seller, including, acts of God, acts or omissions by Buyer, civil or military actions, earthquakes, fires, strikes, flood, epidemics, acts of terrorism, transportation embargos or delays in transportation, Seller will not be liable. In the event of such an occurrence Seller shall have the right to extend the contract performance date(s) for a reasonable length of time to facilitate a recovery for the unplanned, uncontrollable delay.

Disputes—Place of Jurisdiction

The Buyer and Seller will attempt to resolve any contract dispute by good faith negotiations. If unsuccessful both Seller and Buyer shall agree to non-binding third party arbitration as the first legal step in settlement of the dispute.

Any dispute not resolved by negotiation or arbitration may then be submitted to a court of competent jurisdiction in the city of Santa Barbara, California, U.S.A.

In the event that any proceeding shall be brought to enforce or interpret this agreement, the Buyer agrees to pay all of Seller’s court costs and expenses, including such additional sums of attorney’s fees as may be adjudged reasonable by the court.


Controls Integration

From consulting on your existing control design to custom control architectures, our extensive controls expertise can help you get the most out of your motion system.

Your controls strategy is a crucial part of the motion equation.

At Bell-Everman, we know how many different motion control platforms interact with our mechanical motion systems—allowing us to push the envelope in terms of what’s dynamically possible.

Range of Services

Our controls expertise takes into account how your control architecture, stage dynamics and operating environment affect positioning requirements, and we're ready to provide as much or as little controls support as you need.

Our services include:

  • Independent consulting—ensuring your control architecture matches and works well with your system’s mechanical design.
  • Technical services, including commissioning, stage tuning, motor sizing and inertia matching according to your application’s specific motion requirements.
  • Complete turnkey motion systems with integrated controls and application-specific software. We design and deliver everything—linear and rotary stages, control architecture, safety features and more—to work together seamlessly right out of the box.

Featured Systems

Your Technical Benefits

There are technical advantages to allowing us to help with your control strategy.

Commissioning the mechanics and control architecture at the same time ensures both evolve together—leading to new, innovative discoveries about the hardware, control platform or both.

This systems approach—which considers the various ways your motion stages, controls and operating environment work together—lets us drive your motion system to the highest levels of dynamic performance.

 

Get In Touch

 Drives and Controls


  • Bosch Rexroth
  • Elmo Motion Control
  • ModuSystems
  • Omron Delta Tau
  • Teknic
  • Custom ARM based micro-controller
  • EtherCat capable developer




© 2025 Bell-Everman, Inc.