Material Batch Variation in Deep Hole Drilling: What to Adjust When the New Batch Arrives
Material Batch Variation in Deep Hole Drilling: What to Adjust When the New Batch Arrives I have been running deep hole drilling operations for over twelve years, and if there is one lesson that has cost me the most scrap, it is this: the same material spec does not mean the same material. A new batch of 4140 or 304 stainless from the same mill arrives with the same certificate, and within the first ten parts I am resharpening tools that should have lasted a full shift. I used to chase those problems by tweaking feeds and speeds blindly. Now I have a routine. This article covers what actually changes between batches, how those changes show up in the drill, and the qualification steps I run on every new coil or bar stock delivery. ...