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Hartwig knowledge for the soul Your hole size will be undersized, egg shaped and could even have chatter marks. ((Hole Dia. - Tool Dia.) x Feed Rate) / Hole Dia. = New Feed Rate EXP #1: Lets say you have a .750 dia. hole and you need to use a .500 dia. cutter to finish it. Your recommended feed from the factory is 13.0 This will put the proper load on your cutting tool for the surface area that the cutter is contacting inside the hole. EXP #2: Lets say you have a .750 dia. hole and you need to use a .250 dia. cutter to finish it. Your recommended feed from the factory is 13.0 ((.750 - .250) x F13.0) / .750 = F8.6 This will put the proper load on your cutting tool for the surface area that the cutter is contacting inside the hole.
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