In the Hex Pocket Endmill Points Calculator included in the Web Machinist program
(below) the center points of endmills inside the pocket can easily be calculated.
Just input the hex size and the endmill size and Hex Pocket Endmill Calculator calculates
the center points of the endmill and lists the points in the Hex Endmill Points Field.
Also in Hex Pocket Endmill Points Calculator you have the option to calculate the
hex corner points too.