Selecting a Carbide End Mill for Aluminum Applications ...
Mar 01, 2007· A high helix angle, generally around 45 degrees is also helix helps move chips up and out of the cutting zone and also generates an excellent surface finish. The angle also helps soften the impact at entrance of cut, resulting in a smoother, quieter cut (see Figure 1).. For aluminum milling a two or threeflute end mill works best because this allows for larger flute areas.