Orbital rotary blade sharpener

1. An orbital rotary blade sharpener, comprising:

a bottom blade holding portion having a center and a perimeter edge;

a top blade holding portion rotatably connectable to said bottom blade holding portion, having a perimeter and a center;

a central shaft portion extending from said bottom blade holding portion through said top blade holding portion over which a rotary blade can be fitted;

a radial shaft portion extending through said top blade holding portion positioned between the perimeter and the center of the top blade holding portion; and

a grinding portion connected to said radial shaft portion, and within said top blade holding portion, positioned to be orbitally revolvable around said bottom blade holding portion center and contactable with a blade held between said top and bottom blade holding portions.

2. The sharpener of claim 1 , wherein said grinding portion contacts a blade at an angle from the horizontal plane of said blade between 8 and 12 degrees.

3. The sharpener of claim 1 , wherein said grinding portion is coated with a diamond abrasive coating.

4. The sharpener of claim 3 , wherein the diamond abrasive coating is selected from fine diamond abrasive coating and rough diamond abrasive coating.

5. The sharpener of claims 1 , 2 , 3 , or 4 , wherein said central shaft portion is sized to fit through the center aperture of a 45 mm rotary blade.

6. The sharpener of claims 1 , 2 , 3 , or 4 , wherein said central shaft portion is sized to fit through the center aperture of a 60 mm rotary blade.

7. An orbital rotary blade sharpener, comprising:

a base;

a central shaft extending from said base center;

a cylindrical bearing through which said central shaft inserts and in which said central shaft is freely rotatable along the axis of said central shaft;

a top with a central aperture into which said bearing inserts and through which said central shaft inserts;

a grinder shaft housing connected to said top offset from said central aperture of said top wherein said housing is provided with a hollow cylinder;

a cylindrical grinder shaft insertable through said housing hollow cylinder such that said shaft freely rotates along the axis in said hollow cylinder, having a grinder end which revolves around said base below said top, and an engagement end; and

a tightening knob threadably attachable to said central shaft.

8. The sharpener of claim 7 , wherein said grinding end contacts a blade at an angle from the horizontal plane of said blade between 8 and 12 degrees.

9. The sharpener of claim 7 , wherein said grinding end is coated with a diamond abrasive coating.

10. The sharpener of claim 9 , wherein the diamond abrasive coating is selected from fine diamond abrasive coating and rough diamond abrasive coating.

11. The sharpener of claims 7 , 8 , 9 or 10 , wherein said central shaft is sized to fit through the center aperture of a 45 mm rotary blade.

12. The sharpener of claims 7 , 8 , 9 or 10 , wherein said central shaft is sized to fit through the center aperture of a 60 mm rotary blade.

13. A method of sharpening a rotary blade, comprising steps of:

Inserting a central shaft having a base through a rotary blade;

Engaging the edge of said rotary blade with a grinder having a grinder shaft;

Inserting said central shaft through a bushing and into a central aperture in a top;

Inserting said grinder shaft through a grinder shaft housing offset from the central aperture of said top;

Tightening a top knob onto an end of said central shaft;

Connecting a grinder knob to the distal end of said grinder shaft from said grinder; and

Holding said grinder knob, revolving said grinder around said base, sharpening said blade.