On Thu, 04 Jun 2015 14:49:53 -0500, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote:

I can roughly measure a reground 3-flute or 5-flute cutter using my lathe
as a fixture, measuring the shank, then the diff to the cutting edges.

That works. But I don't own a v-mic in order to do it right. Is there
another 'standard strategy' for measuring odd-number-flutes' diameter?

I've been going through all my old texts, and they all show a v-micrometer
as the preferred method. I was hoping for some old 'shop lore' method.

Mill a hole and mike it?

--
It takes as much energy to wish as to plan.
--Eleanor Roosevelt