E= is the diameter of the tool tip. If you were using a 1/2 Diameter BULL NOSE with a .125 Corner Radius it would look like this:
D=.5
E=.25 
__________________
Toby D.
"Imagination and Memory are but one thing, but for divers considerations have divers names"
Schwarzwald
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
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