Ignoramus6607 fired this volley in
:

Let's say that I had an end mill sharpener like a Darex V90 or
whatever. Realistically, how long does it take to resharpen an end
mill (I would hire someone) and how much can I get per dozen of
"professionally" sharpened end mills, say in 1/4" size.

First off, Ig, the 1/4" mills won't be 1/4" once sharpened, unless you're
only touching up the ends.

My guess is that used endmills _from_someone_else_, regardless of
condition, are almost worthless commercially, but might have some decent
value (say 40% of new) to hobbyists. Most shops willing to use re-
sharpened mills are having their own done. About the only way to tell if
a mill has been properly re-ground is to cut with it, unless you have the
optical stuff and the knowlege to inspect them.

LLoyd