====== How the edge should look like ======

{{ :kanten_1.svg?nolink |Technical drawing: Deburring corners}}
like this

{{ :kanten_2.svg?nolink |Technical drawing: Rounded corners}}
or better like this

The rounded edges also minimize the development of nicks.
\\
\\
not like this!
{{ :kanten_3.svg?nolink |Technical drawing: sharp edges - so non}}


and also not like this!
{{ :kanten_4.svg?nolink |Technical drawing: sharp edges like a mushroom - so non}}
\\ 
The mushrooming shown in the last picture forms a sharp edge. Mushrooming occurs on soft Show combat weapon when they are used for fencing.