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I keep seeing new guys ignore the speeds and feeds chart on the machine
Been running CNCs for about 6 years now and I swear I see at least one new operator every month try to wing it with feeds and speeds. They just guess and then wonder why their endmill is chattering or burning up. Last week I watched a kid try to run a 1/4 inch carbide in aluminum at 20k rpm with a .005 chip load. Took out the tool in like 30 seconds. The chart is right there on the control panel! Has anyone else had to stop someone from ruining a job because they wouldn't check the recommended settings first?
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fisher.thomas2mo ago
Had a buddy who decided to skip the recommended feeds on a brand new 3/8 inch endmill running in stainless steel. He cranked the RPM way up and buried it in a corner pocket, completely ignoring the chart taped to the machine door. About 45 seconds later he heard this loud crack and the tool just snapped clean off, sending this little carbide chunk flying across the shop floor and denting a coolant tank. Spent the next two hours trying to explain to his boss why he had to order a replacement and drill out the broken piece from the vise jaws.
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grantw412mo ago
That kid probably thinks the chart is just decorative or something. At this point I'm half convinced some guys think hitting "go" and praying is a valid machining strategy.
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taylor9572mo ago
Nah you're spot on with that. It's like people just skip over the basics and hope for the best. Seen the same thing happen with my buddy's roommate trying to build a bookshelf last week. Dude just eyeballed the measurements and now it looks like a crooked tower. There's definitely a trend where folks treat step by step instructions like optional suggestions. Maybe it's just impatience or thinking they already know better. Either way it's wild how often short cuts just make more work later.
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