Method for preparing a cutting edge on an end mill

A method of increasing the length of time a rotational end mill maintains sharp cutting edges, comprising the steps of:

• a) obtaining the rotational end mill with the cutting edges ground sharp
• b) applying a silicon carbide impregnated brush wheel at variable angles and attack positions to dull selected cutting edges that were previously ground sharp;
• and
• c) applying a PVD coating to said rotational end mill.

A method of increasing the length of time a solid carbide rotational end mill maintains sharp cutting edges, comprising the steps of:

• a) obtaining the solid carbide rotational end mill with non-sharpened or worn cutting edges;
• b) grinding sharp said previously non-sharpened or worn cutting edges;
• c) applying a silicon carbide impregnated brush wheel at variable angles and attack positions to dull selected cutting edges that were previously ground sharp;
• and
• d) applying a PVD coating to desired areas of the solid carbide rotational end mill.

A method of sharpening an end mill, comprising steps:

• a) obtaining the end mill with non-sharpened or worn cutting edges;
• b) grinding sharp said non-sharpened or worn cutting edges producing ground sharp cutting edges;
• and
• c) dulling partially said ground sharp cutting edges by:
• i) rotating said end mill with said ground sharp cutting edges in a first direction and
• ii) applying a brush wheel to selected ground sharp cutting edges, wherein said brush wheel rotates in a second direction thereby dulling said selected ground sharp cutting edges, wherein said application of said rotating brush wheel to said rotating end mill occurs at variable angles and attack positions to dull desired axial and radial cutting edges on said rotational end mill.