c/cnc-operators

Picked flood coolant over mist for my new job, zero regrets

Started at a shop outside Cleveland last month and had to choose between a flood system and a mister for our old Haas. I went flood because the parts are mostly 6061 and I hate the fog hanging in the air. First week ran 120 pieces with no chip welding and the operator next to me asked what I did different. Anyone else made the switch and never looked back?

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the_miles•7d ago

Three shifts to find a 0.003 inch offset in a worn fixture pin

Ran a job all day Saturday and every part came out 3 thou off on the same hole, turned out the locating pin had a flat spot worn on one side and I wasted 2 hours checking tool offsets before I grabbed a mic and measured the fixture itself, has anyone else had a dumb wear spot hide like that?

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riverowens•12d ago

Speed and feed calc from a 1985 handbook saved my part yesterday

I plugged in the old formula from that worn out Machinery's Handbook for a 6061 job with a 3/8 end mill, it said 3500 RPM and 14 IPM, and the finish came out cleaner than anything my CAM defaults ever gave me, has anyone else gone back to the old school math when the software just guesses wrong?

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rowank83•13d ago

Switched to a positive rake insert and my finish passes changed overnight

Last Thursday I swapped my old negative rake holders for a positive rake setup on the same 6061 job I've run for two years, and the surface finish went from 63 to about 20 microinches with zero chatter, so has anyone else seen that big a jump just from insert geometry?

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morganj81•13d ago

Sealed bearing vs. open bearing on a spindle, I picked wrong

Last month I had to choose between sealed and open bearings for a high-speed spindle rebuild on a 10 year old Haas. I went with sealed because I figured less maintenance, but it ran hot after 4 hours and started singing like a tea kettle. Turned out the housing had a slight misalignment from a crash the previous operator never reported, and the sealed ones couldn't take the side load. I swapped to open bearings with a drip oiler and it's been quiet for 2 weeks now. Anyone else get burned by assuming sealed is always better for spindles?

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nora54•14d ago

Took out a $2,300 end mill because I trusted the old setup sheet

On Tuesday in Phoenix, the previous shift left the soft jaws on the 5-axis and that sheet said the offsets were still good, but apparently they got moved during a chip cleanup, and now I get to explain to the boss why a brand new carbide tool is in three pieces on the floor, so does anyone else re-verify soft jaw position even when nothing looks touched?

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ruby_murphy•16d ago

Straight edges on the mill table, is scraped cast iron just better?

Been doing finish work on a 1992 VMC at the place I contract for. The table ways are still the original scraped ones. I ran the same 40 piece job on a brand new machine at a friend's spot last month. The old machine held .0005 all day, the new one was drifting past .002 by lunch. Both had the same tooling and feeds. Is it the hand scraping or did they just stop doing it right on newer stuff? Curious if anyone else has seen older machines out-cut the new ones.

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elliot54•17d ago

Auction lot surprise in Ohio changed my spindle speed habits

Picked up a used Haas at an estate auction near Toledo for $3,800, figured it was a steal. Got it home and the previous owner had ran every job at 4,000 RPM, no exceptions, and the spindle bearings sounded like a coffee grinder after 20 minutes. Turns out he was terrified of chatter from a bad holder and just never tried slowing down or adjusting feed. Now I keep a log card taped to every machine with the sweet spot speeds, and I check that before I even load a tool. Anyone else buy a bargain machine that came with hidden bad habits baked in?

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nathanb71•19d ago

Switched from coolant flood to misting, tolerances finally hold

I ran 600 parts with full flood on my VF-2 and the bore kept growing 0.002 by the third hour, then a guy in the Phoenix shop down the road talked me into trying a Fog Buster mist setup. After a week of tweaks the dimensions went dead nuts for the whole 600 run, anyone else seen that kind of thermal swing difference?

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spencer_thomas4•19d ago

Coolant hose burst on a Friday, shop smelled like a swamp all weekend

Was running a 3 inch face mill on the 4020 when the coolant line blew right at the fitting, sprayed rusty water all over the control panel and the floor drain clogged instantly. Took me 2 hours to mop up with absorbent, and now the machine's acting up on the Z axis. Anyone else had a coolant line blow and mess with their spindle drive?

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willow244•19d ago

My spindle load meter lied to me for 6 months and I lost a $900 cutter

Running a Haas VF-2 at a job shop outside Cleveland. Last Tuesday I was roughing 4140 and the load meter showed 60 percent on a 1 inch indexable end mill. Trusted it and pushed the feed up. Ten minutes later the machine sounded like a rock crusher. The insert pockets were wiped out and the body was cracked. Turns out the previous operator had the spindle load override set to 80 percent for some odd reason. So the meter was reading 60 but the actual load was way higher. Nobody caught it because everyone just checked the screen. Now I teach every new guy to look at the torque curve and the chip color before trusting any number on that display. Has anyone else been burned by a hidden override setting like that? What do you do to check the machine state before pushing feeds?

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the_emery•21d ago

Mist-coated the workholding today, not sorry I did

Was deciding between gluing a fixture plate down forever or just using double stick tape for this one off batch of 40 parts. Took the tape route, and after 3 pulls it held dead nuts with zero cleanup drama. Anyone else stick to tape for short runs or is that just me being cheap?

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jordans18•23d ago

Tool offset typo cost me 40 parts before I caught it

Running a repeat job in Tulsa last Tuesday, I punched in a tool offset wrong by 0.015 and didn't check the first piece like I usually do. By the time the alarm went off on the probe, I had scrapped a whole tray of parts. Anyone else got a story about skipping a basic check that bit you in the ass?

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oscarh16•25d ago

Old controller on a new machine taught me a lesson

I hooked up a 1998 Fadal controller to my 2021 Haas last Tuesday just to see if the conversational mode felt the same. Ran a simple pocket cycle and the damn thing posted moves that would've crashed the spindle if I hadn't caught it in the sim. Anyone else ever mix old control software with new hardware and get weird results?

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rowanw31•27d ago

My foreman swore by WD-40 on taps, 3 broken drills later I'm not so sure

Honestly, he said 'just spray it and go' every time we bust a chip in a blind hole, but after snapping three 1/4-20 taps in a row last Thursday on that stainless job near Akron, I'm wondering if he's ever actually used it on a mill, or if that trick is only for hand tapping, anyone else have a shop myth that never holds up?

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thomas.piper•27d ago

A coolant flood at the plant in Toledo taught me a hard lesson

Last month I was running a 5-axis at work in Toledo and the coolant line split right at the spindle. It dumped about 20 gallons onto the floor in under a minute before I hit the e-stop. The floor was slicker than ice and my tool setter got drowned, which cost me the rest of the shift to clean and dry. Now I check every flex line for cracks before I start the morning run, no exceptions. My supervisor said "just replace it next time" but I could've ruined a $2,000 probe. Has anyone else dealt with coolant hose failures that came out of nowhere, and how do you catch them early?

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xena_jackson•29d ago

Chose a 5th axis over a bigger vise and no regrets so far

I had to pick between adding a rotary 5th axis to my Haas or buying a bigger Kurt vise for the big job I keep getting. Went with the 5th axis last month, messed up the first setup bad, but once I got the offsets right it cut setup time on those angled brackets in half. Anyone else run a trunnion for small batch stuff or do you just muscle through with angle plates?

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sarah_hart•29d ago

Paper tape vs digital readout, I switched back after 8 years

I ran a Bridgeport with DRO for almost a decade, then got a job at a shop where the old machines just had paper tape and scales. First week I nearly scrapped a part because I trusted the numbers over my eyes. I stuck with it for 6 months and learned to read the wear marks on the ways like a map, but when I went back to DRO it felt like cheating. Has anyone else gone backwards on tech and found it made them sharper, or was it just a waste of time?

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alicecooper•1mo ago

That Tuesday last month where everything just worked

Had a day two weeks ago where I set up a new job on the Haas VF-2 and the first part came out within .001 of print. No tweaking, no crashing tools, just smooth sailing from the first chip. The material was 6061 aluminum and I was running a 1/2 inch endmill at 6500 rpm with a .050 radial stepover. Even the coolant flow looked perfect for once. Anyone else ever have a day where the machine seems to read your mind like that?

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lucas_hunt•1mo ago

Unpopular opinion: G-code comments are not optional if you share machines

I work at a small shop in Austin where three of us rotate on the same Haas VF-2. Last month I loaded what I thought was a finishing pass for a bracket and it plunged into my fixture because the previous guy had moved the WCS offset but didn't leave any note in the program. Spent 45 minutes re-cutting that part from scratch. I get that we're all busy and writing comments feels like extra work, but when you skip them you're just setting up the next person to crash or scrap something expensive. I started adding a line at the top of every program that says which operation it's for and what stock setup it needs. Simple stuff like "face pass, 1.5in 6061" or "bore cycle, part in vise at Z-2.0." It takes maybe 10 seconds per program and nobody has crashed on my work since. Does your shop have any rules about what goes in headers or are you all just going by word of mouth?

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jade_butler•1mo ago

I see guys setting zero wrong on every setup

Been watching people at my shop in Denver keep hitting Z off the wrong reference surface. They lose 20 minutes re-cutting every time. Anyone else notice this being a problem in their place too?

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grace_hunt84•1mo ago

Just realized I've been programming tool offsets all wrong for 8 years

I used to set all my tool heights by touching off on the part surface every time. Did it that way since I started on a Haas VF-2 in 2016. Switched last month to using a fixed renishaw probe and a dedicated reference tool. Cut my setup time from 15 minutes to about 4 minutes per job. Anyone else stubbornly stick with old methods way longer than they should have?

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cooper.nathan•1mo ago

Tried single flute end mills for aluminum and ate through chips way faster

I always ran two flute end mills for aluminum on my Haas VF-2. Buddy at the shop swore by single flute for chip evacuation. Finally tried one last Thursday on a batch of 6061 brackets. The difference in chip clearing was night and day, no more recutting chips jamming up the flutes. Has anyone else found a tool geometry that changed their approach to a specific material?

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aaron_wilson17•1mo ago

Saw a 0.0005 inch difference on a mic and it blew my mind

I was checking some parts last Tuesday and noticed my bore mic was reading slightly off on a tolerance that called for plus or minus 0.002 inches. I got curious and looked up the calibration history on the shop's computer system. Turns out that mic was last certified 18 months ago, which is way past the 6 month cycle we're supposed to follow. I spent an hour going through old inspection reports and found that about 30% of the parts we ran in that time were measured with that same out of spec tool. My boss didn't believe me until I showed him the log. Has anyone else had a similar surprise from checking calibration records on your tools?

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jasons63•1mo ago

Finally switched from coolant mist to flood coolant on my Haas

Ran with a mist system for about 2 years, but it was always getting into the control box and causing issues. Swapped to flood last month and the finish on my aluminum parts is way better plus no more cleanup headaches. Anyone else make a similar switch or stick with mist for a specific reason?

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