You can not ban centrifugal force, so why not use it instead? Centrifugal Applied Technology (CAT) is the first knife system that turns centrifugal force to its advantage, rather than being limited by it. OERTLI is unveiling this innovation at LIGNA.
The knives of woodcutting tools are subjected to strong rotary motion. Centrifugal force pulls the knives outward, limiting the maximum rotational speed. By contrast, CAT knife technology is designed so that centrifugal force moves the knives to the ideal position and holds them there with zero play. At a diameter of 180 mm, CAT tools can run at 13,000 rpm and a cutting speed of 120 m/s. That makes CAT the fastest knife seat in the industry.
Stocker Fensterbau was the first window manufacturer in Switzerland to deploy CAT tools, 6 months ago. Now they run at 13,000 rpm with an 18 metre feed rate, and with outstanding surface quality: «Now that we are using the CAT tools, we hardly have to retouch the dressed timber before varnishing or painting. They come from the machine in perfect condition», says Plant Manager Christoph Schwab.
For the machine operators at Stocker Fensterbau, there is another important aspect: «Changing knives is easy and lightning fast!» A single tool for all the screws, easy access and simple positioning: «The knife is automatically in the right place. I only have to tighten the screw.»
Thomas Oertli, Managing Director at OERTLI, played a key role in the development of CAT. «The performance that Stoker achieves with the new tools exceeds our expectations.» A cutting speed above 100 m/s - at Stocker it is now 120 m/s - is higher than the recommended value for woodcutting. The fact that it actually works is due to precise matching of all parameters: balance quality, tool weight and centre of gravity, and machine capacity.
For Christoph Schwab, surface quality makes the difference. He sees a CAT tool as an investment in the quality of his windows and the resulting customer satisfaction.