The 90 0 countersink helps to make a chamfer into the core hole. Then, you can use the twist drill to drill a core hole. The thread cutting process involves centering with a punch. You can calculate the diameter for tapping using the formula below:Ĭore hole diameter = Tap diameter – Thread pitch. Internal machining taps are classified based on their nominal sizes. Then, it is also important to know the right tap to use for the cutting.
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