SPINNING
Once a flat metal disc is mounted in place, the lathe begins to rotate.
Pressure applied by a spinning roller pushes the disc over the tool
using a back and forth motion. This process is called "multiple pass"
and maintains a near-constant thickness.
Conical shaped parts can also be produced using the "flow-forming process".
Instead of multiple passes, a flow-formed cone is formed in a single pass.
In this case, the part is essentially extruded from the starting blank,
reducing the wall thickness by approximately 50%. Cones with an included
angle of 60 degrees or greater can be accommodated using this method.
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