The heel of an end mill refers to the transition area at the back of the relief land, where the relieved surface meets the flute or the core of the tool. It is the lowest point on the relieved surface, opposite the cutting edge.
Heel
The heel of an end mill refers to the transition area at the back of the relief land, where the relieved surface meets the flute or the core of the tool. It is the lowest point on the relieved surface, opposite the cutting edge.