GONRA made an Eccentric Spindle Indexer that screws directly onto my SB lathe spindle
to grind RADIAL RELIEF onto 1, 2, 3, 4 flute cutters.
Eccentricity is dialed in with 1 inch 40 tpi clamp screws.
Verkpiece (cutter, end mill, tiny number drill, etc.) centering is established optically
with a 40X "milling machine lineup/centering scope" mounted in lathe tailstock.
Grinding is with a Wholesale Tool electric hand grinder mounted on the lathe compound.
Verkpiece is chucked up in a 3/4 shank ER-16, ER-20 or.... commercial collet
mounted on an indexing wheel.
Etc. Etc. Etc......
I know, just lottsa GONRA crapola but it verks Just Fine
Just keep Lathe Spindle Speed down!