MTFCA Forum

Do the indentations have a function or are they there due to the manufacturing process?
L

mine has something similar. Probably manufacturing process

The indentations are there to make the thickness of the magnets consistent. When metal or any malleable material is bent the material at the outer radius is pulled in tension. At the inner radius it is in compression. The material flows as the molecular bonds are broken and reestablished. The thickness of the magnet at the outside radius will become thinner than the base metal. Similarly, the inside radius of the bend will become thicker. In order to keep the thickness of magnets at bends consistent, a secondary stamping operation would be to used compress the bend to a specific thickness. The other ends of the magnets are stamped too to a certain thickness to set clearances. Stamping both the bend and ends of magnets at the same time also makes the manufacturing operation easier.