Different blade grinds: the curvature of material near the edge affects cutting properties significantly. Image created by uploader.
<ul><li>derivative work: <a href="//commons.wikimedia.org/wiki/User:McSush" title="User:McSush">McSush</a> (<a href="//commons.wikimedia.org/wiki/User_talk:McSush" title="User talk:McSush"><span class="signature-talk">talk</span></a>)</li>
<li><a href="//commons.wikimedia.org/wiki/File:Blade_grinds.PNG" title="File:Blade grinds.PNG">Blade_grinds.PNG</a>: Polyparadigm</li></ul>
<ul><li><a href="//commons.wikimedia.org/wiki/File:Blade_grinds.PNG" title="File:Blade grinds.PNG">Blade_grinds.PNG</a></li></ul>