Our art: sheet
metal spinning

Spin forming and flow forming have always been our job and they have always required an approach more practical than scientific: to achieve quality results, an expert hand must support even the most innovative technologies.

That's why our most important resource is people, their skills and their expertise, achieved over many years of training on spinning lathes: manual, semi-automatic and CNC with teach-and-playback system.

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Materials, thicknesses and
diameters: a wide range.

Today we work with care and precision from the most docile metals like iron, copper, brass and aluminum, to the most tenacious like stainless steel and special alloys. With ordinary equipment we reach diameters of 2.4 meters and thicknesses up to 10 mm of iron, 6 mm of stainless steel, 15 mm of aluminum. With our special lathe for large sizes we can turn 12 mm sheets up to 5 meters in diameter.


Standard forms…

Througout two generations, at Giotto Fratelli we have been spinning the most different forms, thanks to both single and modular lathe dies: cones, spheres and hemispheres, cylinders and other shapes, in various sizes. This is how today we have a large variety of available moulds, giving the opportunity to our customers to contain time and costs.

...and bespoke moulds

When the appropriate moulds are not available, we can still make them on design: our agents, our technicians and our sales department, are always willing to provide support, leading the customer towards the most effective and convenient choice.

* Spin forming or flow-forming?

Both spin forming (often referred as metal spinning or sheet metal turning) and flow forming, consist in forcing a metal disk against a mould. Disk and mould are secured together on a special lathe spindle. In contemporary technologies, spin forming and flow forming are often combined in a single process, generically referred to as spin forming, metal spinning or sheet metal turning.

“(Sheet) metal spinning” AKA “Spin forming” or “sheet metal turning”
The thickness of the material in the final product differs just slightly from the thickness of the initial disc, while the diameter of the article can be very different from the starting disc one.

"Flow-turning" or "flow-forming"
The diameter of the starting metal disc is almost the same as the final one of the product. This is due to - even significant - variations in the thickness of the final product walls.