TABLE OF ELONGATION
Corner Radii. Avoid sharp corners when possible. Generally, a formed radius should be specified as not less than 2 to 3 times material thickness. However, radii of up to 1 times material thickness are possible, especially on thicker materials. Secondary machining can sharpen a radius if necessary.
Total indicated Roundness (TIR) – Concentricity is affected by diameter and material thickness. Is good to compare cost vs tolerance for selecting the manufacturing processes. For example, deep drawing may be capable of tighter tolerance, but the tooling cost in much higher. If you don’t need too tight tolerance, especially for shorter runs, metal spinning can save you money.