About
Metal spinning, also known as spin forming or metal turning, is a precise metalworking process that forms axially symmetrical components by rotating a metal disc or tube at high speed over a mandrel. Unlike traditional machining, metal spinning does not remove material but molds it over a pre-shaped form, making it both efficient and material-saving. The process can be performed manually or with CNC lathes for greater precision and repeatability. Metal spinning is widely used in both artisan and industrial applications, producing everything from decorative household items and architectural lighting to aerospace components, rocket nose cones, cookware, and gas cylinders. It supports a wide range of ductile metals including aluminum, stainless steel, Inconel, Hastelloy, and other high-strength alloys. The size and complexity of the finished parts are limited only by the equipment used, allowing for the creation of deep or wide components with seamless construction. The spinning process involves clamping a pre-cut metal disc onto a lathe-mounted mandrel and applying force through tools or rollers as it spins at high speed, shaping the material into the desired form. For advanced shapes or thinner walls, techniques such as necking or hot spinning may be used, where heat is applied during the forming process to make the metal more malleable. This results in seamless, high-strength parts ideal for high-pressure or critical-use environments such as scuba tanks and CO2 cartridges. Tooling for metal spinning is relatively low-cost compared to other methods like stamping or hydroforming, making it ideal for prototyping as well as high-volume production. Tools can include hardened steel spoons, brass rollers, or rotating ceramic-coated components depending on the application and material. CNC metal spinning provides additional advantages in speed, consistency, and complexity of shapes. The process also offers low material waste and high structural integrity due to the seamless nature of the parts produced. However, one drawback is that if a spun part is damaged, it is typically not cost-effective to repair. Despite this, metal spinning remains a cost-efficient and flexible manufacturing solution for producing round metal components with excellent mechanical properties and aesthetic appeal, making it a preferred method across multiple industries.
