James Cook
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to elaborate on my above forumla using your example of .811 dia hole with a .500 e.m. Lead in/out=.089777966 Arc radius= .051833333 Arc Sweep= 120 Deg. Works every time...also can be useful for other things too. EDIT---also must use tangent entry for this to work [ 05-23-2002, 01:51 PM: Message edited by: James Cook ]