Charles A. Sherwood wrote:

Buy extended endmill holders and grind a flat on the shank of the
endmills. Thats da only way.



I suppose that means I need to buy a diamond grinding wheel
to grind a flat on carbide endmill? Why don't they come with flats?

cs




A silicon (green) wheel will grind carbide. They usually don't have
flats because there are better ways of holding endmills than with a
setscrew. At the high end, they use heat shrink tool holders.