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Old timer at my last shop changed how I see feeds and speeds
Guy had been running Bridgeports since the 70s, told me to stop overthinking the numbers and just listen to the cut. Anyone else had a mentor like that who taught you more in 5 minutes than any manual?
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ward.anna8d ago
Oh man that's exactly it. I had an old mold maker show me how to read the chip color and sound - changed everything about how I program now.
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mileslane8d ago
Wait, I have to disagree with you there @ward.anna. I've never bought into the whole chip color and sound thing. My machines are set up with modern sensors and I just go by the numbers on the screen. That old school stuff is fine for a hobby shop but in a production environment you need consistency, not some guy's opinion on what the chips look like.
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Chip color and sound went out with manual machines. I run a shop with seven Haas VF-4s and we switched to toolpath optimization software two years ago. Our scrap rate dropped from 3% to under 0.5% because we stopped guessing and started using actual data from the spindle load meter. That old school approach might work for one-off jobs on a Bridgeport, but when you're pushing out 500 parts a day you can't have someone standing there listening to the cut like it's a musical instrument. The numbers on the screen don't lie and they don't get tired. I still respect the old timers for what they knew, but production machining needs repeatability, not intuition.
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