Chamfers

Traditional chamfers must be avoided because they need extremely fragile tools.

Figura 8
Image 8 is a schematic drawing of the punch which would produce traditional chamfers: it is easy to understand that it’s shape makes it very fragile.

Figura 9
Image 9 shows the solution which is commonly adopted: inserting a small flat makes the punch much stronger.

Figura 10
Another possible solution, for chamfers around holes, is to insert a short cylindrical section before the chamfer: the shaft (or core) which produces the hole would then be stronger.

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