Cartesian systems provide low cost entry into robotics
Because they are constructed from standard off-the-shelf products, such as belt-drive/ball screw axes, servo-motors, drives and standard grippers, Pacepacker Services says the cost of Cartesian robot solutions can be much lower than traditional five and six axis robots.
Since June 2013, Pacepacker Services has been working closely as a technology partner with Festo on twin-axis Cartesian style pick and place robots. When the need arose to build a robust, reliable solution for a food automation application, Pacepacker purchased Festo components to incorporate into a newly designed two axis Cartesian system.
“Cartesian systems allow manufacturers to enter the automation sector with a lower initial investment in both equipment and training,” says Paul Wilkinson, Pacepacker’s business development manager. “The cost of any system will greatly depend on the footprint, payload and speed required. The big question is: ‘What is the best solution for each enquiry we work on?’ and as we have the widest range of pick and place solutions in the UK, we are able to make sure each integration is based on the technology and components required. Other providers may have fewer alternatives to offer and specify a system that is overpriced, excessively large and capable of high speeds not required. The lowest cost Cartesian system could be as little as £1,500 but could be as high as £50,000 if the footprint is very large and the payload high.”
The Cartesian designed by Pacepacker can be re-programmed for a diverse range of tasks and differing packaging sizes, improving the flexibility of the overall solution. “The system has two axes of movement as standard and is a good typical solution for most pick and place operations where packaged items are placed into distribution packaging, like cardboard boxes, cases, retail trays and trolleys,” explains Paul.
Additional axis can easily be added to create more complex solutions: “One advantage of the modular system is that you can fully mix and match the technologies,” he continues. “If complex motions are needed in X and Y and only up and down movement in Z, then you can opt for two axes of electrical motion and a single Z axis in pneumatic, reducing the cost and increasing simplicity. Motion control can be provided via complex motion co-ordinators, allowing full interpolated path control, right down to point to point pick and place for the simplest and most cost effective solutions.”
Buy-in from operators and machine setters can be better with Cartesian systems than with robots, as they do not feel threatened by complex technology and tend to work closer with management to be early adopters of automation projects. “Cartesian systems allow the first step to full automation by using simple technology to solve complex and time consuming tasks,” comments Nigel Dawson, product marketing manager at Festo. “They use simple products and technology to automate lines without the need for complex robots and the operators can clearly see the advantages. The equipment used is based upon fully standard and well known technology, making spares availability easier and reducing the need for high skills and training within maintenance departments.
Energy efficiency, adds Nigel, is also a key driver for such technology. “Serial kinematic robots are often moving very high masses for very little payload – the actual moving part of the robot weighs many times what it is actually moving. Parallel kinematic systems such as the Festo H and T handler offer high mass capability, whilst reducing the actual weight of the moving robot. Imagine using a smart car to transport a single person 500 miles then compare the energy used with a coach transporting the same person the same distance.”
If complex motions are needed in X and Y and only up and down movement in Z, then you can opt for two axes of electrical motion and a single Z axis in pneumatic, reducing the cost and increasing simplicity. Motion control can be provided via complex motion co-ordinators, allowing full interpolated path control, right down to point to point pick and place for the simplest and most cost effective solutions.
For manufacturers looking to invest in automated solutions, concerns over ROI are eliminated. Productivity is increased as Cartesian systems do not take breaks or holidays and do not get sick, ensuring the machine is running to its optimum output. Secondly, energy efficiency is improved over traditional robots. Thirdly, because the initial investment in equipment is kept to a minimum, the payback period on a Cartesian can be much lower than other forms of automation. Fourthly, the spares needed to keep a Cartesian system running are both cost effective and simple to obtain as they are standard parts used in many applications, so the cost of ownership is therefore reduced. Finally, the quality of the output from a Cartesian can be guaranteed, ensuring scrap and wastage is reduced, increasing the return even more.
Paul Wilkinson concludes: “The Cartesian range of systems that we integrate from Festo is just part of the jigsaw when it comes to implementing an effective pick and place solution. It gives us the ability to enhance our product offering from low tech, low speed through to high speed delta robots so that each installation has the most suitable solution.”
Visit the Pacepacker Services website for more information.
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