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Vent: the old guy at the shop in Dayton told me to bump my feed 20 percent on 6061 and he was dead right
I ran the same 6061 bracket job for 3 months at 40 IPM because that was the book number and I figured slower meant safer. Gary, the guy who trained me at the shop in Dayton, kept telling me to push it to 48 IPM and I kept brushing him off because he is 68 and still writes his offsets on a notepad (no offense to Gary, the notepad works). Finally tried it last Tuesday and the finish came out cleaner, the chips broke nice, and I knocked 11 minutes off the cycle. Anyone else got a mentor whose old school advice turned out to be right when you finally tried it?
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quinn1616h ago
My old lead hand Norm used to say the book numbers assume you got a brand new cutter and a spindle that runs true, which nobody actually has. When you bump the feed you start rubbing less and cutting more, so the tool stays cool and the chip carries the heat away instead of dumping it in the part. Same idea as Gary's notepad, the guys who ran it before CAM software had to feel it out by hand.
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