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A grinder hand in Fort Wayne told me to quit burying my inserts, and my tool life jumped
About 4 months ago I was burning through CNMG inserts on a rough turning job, swapping a corner almost every 25 parts on 4140 steel. The old guy who ran the OD grinder walked over, looked at my chips, and said "your chips are blue and curled tight, you're pushing it too hot and deep, back off the feed and let the insert breathe." I thought he was full of it until I checked my speeds and feeds against the book and realized I was running way past what the insert could handle. I dropped my depth of cut from .150 to .100 and slowed the feed, and suddenly I was getting almost 90 parts per corner instead of 25. Same insert, same material, just stopped trying to hog it all in one pass. The cycle time went up maybe 40 seconds but the tool changes and scrapped parts went way down, so it washed out. Any of you ever get told to slow down by someone on the floor and actually listen?
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