I was at a shop in Phoenix last month and this 30-year vet said compressed air is a gimmick, so I tried running no coolant on 6061. Now I'm out $80 on carbide and the parts had terrible finish. Anyone else get bad advice from some old-school machinist that cost you parts?
I was doing a production run of 200 aluminum brackets on my Haas last Friday and a machinist from the next bay over said I was wasting coolant running it full flood. So I switched to a mist setup and within 30 parts my surface finish went to hell and I burned through two end mills before I switched back. Has anyone else had a bad experience following someone's coolant advice on aluminum jobs?
I've been running that machine for about 8 years and never added up the cycles until I saw the meter. Makes me wonder how many of those hours were wasted on setups versus actually cutting chips - anyone else ever check their total spindle time?
Turned out the soft jaw was grabbing .005 higher on one side. Anyone else waste a whole shift on something this dumb?
Pete the night shift lead told me to run my first pass at 80% depth of cut instead of babying it at 30%, and after trying it on a job last Thursday I stopped chattering and finished the part in half the time, anyone else ever get advice that went against everything you thought?
I watched a old timer at a job shop in Detroit deburr a aluminum bracket for like 5 minutes and I thought he was wasting time. Turns out he was right, that little edge left on there made the next operation a pain because the part would shift in the vise. I started spending an extra 2 minutes per part last month and my scrap rate dropped from 8% to almost zero. Has anyone else noticed a big difference just from taking the time to clean up edges before the next step?
I grabbed a set of 10 coated carbide end mills from a popular online seller for $200 thinking I was getting high quality. After three hours of cutting 6061 aluminum, the coating was flaking off and the edges were chipped on half of them. My cheap $50 set from a local supplier has lasted way longer than these fancy ones. Anyone else been burned by overpriced tooling that just looks good in the pictures?
This guy named Gary at my shop told me to triple check my chip load calculations before every job, even if I thought I knew the material. I always ran 0.004 per tooth on aluminum and called it good. Last month I actually sat down and did the math for a 6061 part, turned out I was way too low and burning up my end mills. Bumped it up to 0.007 after reaming his advice and the finish came out perfect. Took me 3 tries to get the feed right but now my tools last twice as long. Has anyone else had an old school guy save them from a dumb mistake like that?
I was at a small shop in Denver last month picking up some inserts and overheard an older setup guy tell a trainee "don't trust the offsets, trust your indicator." It hit me because I've been burned twice this year just typing in numbers from the tool setter without double checking. Has anyone else had a tool length offset throw off a part because you trusted the machine instead of measuring yourself?
I dropped $150 on a cheap coolant mist collector for my Haas mill about 6 months ago. On one hand, my lungs feel way better and the shop floor isn't slippery anymore. On the other hand, it clogs up every few weeks and I spend an hour cleaning it out. Has anyone else tried the budget route for mist extraction or did you just go with the big expensive systems?
Ngl, I saw this set of five carbide end mills from some online brand called 'PrecisionCut Pro' and thought I was getting a steal for $150. First cut on a piece of 6061 aluminum and the thing chipped before I even hit full RPM. The other four lasted maybe 10 minutes total before they were dull as a butter knife. Has anyone else gotten burned by those budget multi-packs on Amazon?
I run a small side shop out of my garage on weekends, doing repair work for local machine shops. Last month I finally pulled the trigger on a Renishaw-style probe kit from one of the aftermarket suppliers. Figured if it saved me even one setup headache, it was worth it. First job I used it on was a bracket with 12 blind holes that had to be dead nuts on location. I probed all the datums and let the machine find zero on its own. Took maybe 20 minutes total, and the parts passed inspection on the first shot. Normally I would have spent an hour and a half facing and indicating with a dial test indicator. I still keep the old indicator in the drawer as a backup, but I don't see myself going back. Has anyone else switched to probing and found weird issues with repeatability on older machines?
Had a job making some aluminum brackets for a local shop in Denver. Nothing crazy, about 200 pieces. First thing that went wrong was a collet nut that wouldn't tighten right on machine #2. Then the coolant pump on machine #1 started making this whining noise and just died mid cycle. Lost like 3 hours. Then at 2pm I realize the offsets on machine #3 got shifted somehow, scrapped about 15 parts before I caught it. By 4pm I was at 45 good parts and the rest was all bad. Boss was pissed. Said I gotta make up the time this week. Anyone else have one of those days where everything just falls apart at once?
Had been fighting with tight tolerances all day and finally noticed my roughing passes were cutting way deeper than programmed. Turns out I forgot to set my offsets after an emergency stop and wasted 3 hours and a whole block of aluminum before catching it. Anyone else have a moment where you realized you just completely skipped a step from the start?
I was running a Haas VF-2 at my shop in Charlotte last year and kept having these random tool chatter issues on aluminum parts. Swapped inserts, checked speeds, tightened everything down. Nothing fixed it. Then one day the coolant guy comes by for our quarterly refill and tests our mix. Turns out I was running at like 3 percent concentration instead of the recommended 7-10 percent. The gauge on my mixing barrel was busted (typical, right?) and I just assumed it was accurate. He showed me how the low concentration reduces lubricity, which causes that harmonic vibration. After he dialed it in properly the chatter vanished on the very next part. Has anyone else had a coolant issue that turned out to be something totally obvious you overlooked?
Ran into a retired guy at a tool swap last weekend. He said WD-40 leaves a film that attracts grit over time and eats away at the surface. Said to use a light way oil instead. I've been doing it wrong for like 8 years. Anyone else get told something simple that ended up being a big deal?
Talked to a guy at a trade show in Cleveland a few months back. He runs a one-man shop doing mostly brackets and custom parts for local manufacturers. Said he was looking at dropping $150k on a used 5-axis. I asked him what he was running now. A beat-up Bridgeport and a Haas TM-1 from 2005. He admitted half his jobs could be done on a manual mill. Felt like everyone at the show was pushing 5-axis as the only way forward. But for a guy doing 50 parts a week? Seems like overkill to me. Am I missing something or does the industry just want us all to upgrade before we need to?
I ran a shop in Austin for 5 years and just switched to a refrigerated dryer setup. The difference in tool life on my Haas VF-2 was insane, like my tooling costs dropped about 40% in the first 3 months. That moisture in your lines from a regular compressor is killing your spindle and your endmills, not just your pneumatics. Has anyone else here made the switch and seen a real difference?
Guy walked up and said I was running my end mill way too fast for the aluminum I had. He showed me on my own machine how dropping 1500 RPM kept the heat down and doubled my bit life. Anyone else had to unlearn bad habits from watching too many YouTube tutorials?
Guy named Frank at Precision Components in Dayton had been running CNCs since the 80s. He told me I was wasting time dialing in offsets by hand on our Haas VF-2ss when the probe could do it in seconds. But when his probe was off by 0.003 on a tight tolerance job for a medical part, I had to re-cut 12 pieces. Has anyone else seen a probe fail on a critical run?
Had a veteran CNC guy at a shop I used to sub for tell me to reverse my climb/conventional direction on a tricky stainless job. I thought he was crazy since everything I learned said stick to climb milling for finish. Decided to try it on a test piece last month and my tool life jumped from 4 parts to 12 per end mill. The harmonics just shifted enough to stop that chatter I was fighting. Has anyone else gotten advice that went against the textbook but worked out way better?
Kid set the feed at 300 IPM on a titanium part without checking the tool data. Wrecked a $400 endmill in under 30 seconds. How do you train people to respect the machine limits without sounding like a jerk?
Been running a Haas VF-2 for about 3 years now and always had trouble with thread chipping in 6061. Last week I tried using a rigid tap with a little WD-40 at 1500 rpm instead of the usual tapping fluid. Came out perfect on 40 holes for a customer's part. No broken taps, no rework. Wondering if anyone else has found a weird fluid combo that works better than the fancy stuff.
I had a stainless steel part that needed a tight +/-.002 tolerance on a critical bore. Normally I baby step the offset and check twice, but today I just trusted my last tool offset after a quick test cut. It hit right on the money with the mic. Anyone else have those days where you just nail the first try? What do you do when you get that feeling?