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Smoke during my aluminum sign cut showed me feed rate flaws
I was making a custom sign from aluminum plate on my shop CNC router. I programmed the tool paths but guessed on the feed and speed. Part way into the cut, I saw smoke rising from the material. The feed was too slow, so the tool just rubbed and heated up. I hit stop right away and let everything cool down. After that, I recalculated the chip load and ran it again with no issues. It was a simple mistake that cost me time and a bit of material. How do you guys figure out your starting feeds for new jobs?
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fiona2066mo ago
Has a friend ever TOTALLY fried a project because of bad feeds? My pal was routing aluminum brackets and set the feed way too slow, just like you said. The bit got so hot it SMOKED and left a burnt groove in the metal. He learned to ALWAYS start with the tool maker's speed guides now. Trial runs on scrap material save so much headache too.
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brookes376mo ago
Oh man, that smoking bit sound is the worst! You can smell that mistake from across the shop. It's such a gut punch when you ruin a piece that's already cut to size. Those guides exist for a reason, but we've all been tempted to just wing it to save five minutes. Ends up costing an hour and a new bit every single time. Your friend is smart to make that rule for himself now.
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