I'm wanting to do a part we previously did on mill in a lathe because it has a robot and will run faster then threadmilling. The thread is a 4 in. -8tpi internal pipe thread. I want to use a g76, but I'm not sure how to find my amount of taper and major and minor dia., it is for a mechanical fit and is an aluminum casting, I know I can wing it and make it work, but I would like to know that it is done correctly, any help would be appreciated.
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