Anybody know of a rotary blade sharpener?

[Bird]

I've done both; angle grinder and bench grinder. In years past, I took the blades off both finish mower and rotary cutter, put then in the vise and sharpened with the angle grinder. Of course the lawnmower blades were sharpened sharper than the rotary cutter blades. But now I have no 4 1/2" angle grinder, but do have a good bench grinder, so last week, I cleaned up and sharpened the blade for my Toro ZTR. I do have a little Harbor Freight pneumatic angle grinder with sanding disks that can put a finer finish on my axe, lopping shears, etc. and on occasion, I've even used it on lawnmower blades.