To quickly and efficiently bring new products to the market, the industries require rapid ways of building stable and accurate prototype tooling.

Metronor and Tetrafix now introduce a novel approach that sets new standards in terms of tool-alignment speed and accuracy, combined with excellent mechanical stability.

While flexible and reusable, the currently most common “Lego” principle is costly, requires a large inventory of components, is time consuming to configure accurately, and sensitive to temperature expansion issues. When used as a checking gauge, accuracy and stability is essential. It is equally important that the tools are lightweight and easy to reconfigure as needs dictate.

Considerable savings could be achieved if such tools and fixtures met the following criteria:

• Precise alignment of all critical tool features in minutes, not hours or days;
• cost-efficient and completely reusable with no need to cut or machine components;
• high strength and excellent stability to enable care-free handling and lifting; Lightweight for easy, manual handling;
• insensitive to temperature variations to ensure accuracy on the shop floor;
• and the ability to create a wide range of geometries with a limited number of standard components.

Tetrafix's and Metronor’s new approach meets all these requirements.

By using a patented concept with structures made of modular carbon fibre tubes and adjustable joints, the required tool geometry can be built in minutes.

The Tetrafix structure permits free movement of the detail adapter in space, making the positioning process quick and efficient; and the structure is simply locked in place using a hex key once the correct position is reached. Thereafter, the LED cluster is removed and the tooling detail is clamped in its place. Once locked, the entire structure is extremely stable and fully able to withstand the shop floor environment.

To align tooling details like clamping devices, net blocks and indexing pins to within 0.1mm accuracy, a special tetrahedron cluster with a number of LEDs are clamped onto the tool detail adapter. These LEDs are monitored by a Metronor DUO portable coordinate measurement system, providing continuous feedback on position until the detail is in the required position.

The DUO system can measure the position of several targets simultaneously and is, therefore, the only affordable system able to measure the position and orientation of the tetrahedron, with sufficient speed and accuracy in the volumes required.

 www.metronor.com