💡Thought Shares

c/cnc-operators

29

ruby_henderson36•2d ago

I finally visited that new CNC shop over on Industrial Blvd last week

Stopped by Precision Machining Solutions last Thursday just to see their setup. They had a Haas VF-4 running some crazy aluminum parts with a 5th axis trunnion. I watched their guy change tools in like 8 seconds flat with their automatic tool changer. Has anyone else tried running their programs through a post processor for a Haas compared to a Fanuc?

17

henryp40•3d ago

Saw a huge difference in surface finish after switching coolant brands

I was getting these weird streaks on aluminum parts for like 2 months straight at my shop in Tulsa. Finally swapped from the generic stuff to Blaser Swisslube and the finish cleaned up right away. Has anyone else seen that big a change just from changing coolant? I'm wondering if it was the concentration or the actual formula.

16

nancyn69•5d ago

Hit 20,000 hours of runtime on my oldest CNC and it caught me off guard

I was doing some maintenance on my 2007 Haas this morning and noticed the spindle runtime counter read 20,047 hours. That machine was my first real purchase back when I was running parts out of my garage in Youngstown. I remember thinking I'd be lucky if it lasted 5 years without a rebuild. It's still holding tolerances within 2 tenths on most jobs, just takes a bit longer to warm up. Kinda makes me wonder how many of these older machines are still out there running parts every day like nothing changed. Has anyone else had a machine hit a crazy high hour count and keep going?

25

knight.dylan•6d ago

Visited a shop in Detroit last month and noticed their tool offset sheets were all handwritten on scrap paper

The old timer running the place said they never bothered with digital tool presetters and just used a worn-down micrometer and a notebook, has anyone else run a whole shop that way and actually kept tight tolerances?

19

seth_singh20•7d ago

Spent $400 on that fancy coolant mist collector and it clogged within a month

I run a Haas VF-2 at a shop in Denver and figured the high end separator would save me cleaning headaches. After maybe 4 weeks the internal filter was totally gummed up and the suction dropped to nothing. Ended up going back to the basic $80 mesh system we had before. Has anyone else had bad luck with those expensive mist collector units?

1

piper779•9d ago

Appreciation post: The old timer who told me my feeds and speeds were garbage

About 3 years ago at a shop in Cleveland, a retired machinist named Frank saw me struggling with a stainless steel part. He walked over and said, 'You're running that thing like it's aluminum, kid.' He showed me his worn-out notebook with hand-written rakes and angles for every material. It completely changed how I approach cutting, and I still think about that conversation. But everyone else in the shop swore by their CAM software defaults. Has anyone else had a veteran teach you something that contradicted the manual?

1

the_jake•11d ago

Spent 4 hours chasing a 0.003 inch offset that was just a dirty collet

I was working on a Haas VF-2 last week trying to hold tight tolerances on some aluminum brackets and kept getting this weird drift on my X axis. After tearing apart the machine, checking backlash, and even swapping out the tool holder, I finally noticed a tiny bit of swarf stuck in the collet. It took me a good 4 hours to figure out something that a 20 second cleanup would have fixed. Anyone else ever waste half a shift on something this dumb?

14

robin591•13d ago

Wasted $200 on cheap end mills from an online auction

I saw a lot of 50 end mills on an auction site for a steal, like $200 total. Figured I hit the jackpot, you know? Got them in and half were chipped or dull, and a few were even the wrong shank size (like 1/4 instead of 3/8). Ended up trashing most of them after a single pass on aluminum because the cut quality was garbage. Anyone else get burned buying tooling in bulk like that?

9

paul_taylor21•13d ago

Swapped from parallels to a 5-axis trunnion table 3 weeks ago

I had to pick between keeping my old setup or switching to a DMG Mori 5-axis for a high-tolerance job. The learning curve on the trunnion was brutal for the first week but I finished the part in 2 ops instead of 5. Has anyone else made that jump and felt like they were starting over?

2

the_simon•14d ago

Swore by HSS end mills for 10 years until a carbide demo changed my mind

I used to think carbide end mills were overpriced junk for hobbyists until a tool rep let me try a 3/8" variable flute model on a job last Tuesday. Running 4140 at 350 SFM with full axial depth, it cut time from 45 minutes to 28 and the finish was way better. Has anyone else had a specific tool type that surprised them after being skeptical for years?

4

grantp14•14d ago

Had a chat with a retired toolmaker last week that made me rethink how I approach setups

I was at a local machining meetup in St. Louis and this older guy, must have been 70 something, started talking about how he used to do setups on old manual Bridgeports. He said something like 'you young guys spend too much time trying to get perfect numbers and not enough time thinking about what the part actually needs.' At first I thought he was just old school ranting, but then I watched him look at a job I was struggling with and point out a simple fixture change that saved me 15 minutes per part. It hit different because he wasn't talking about being faster, he was talking about being smarter with what you got. Made me realize I've been chasing tenths on stuff that didn't need it. Has anyone else had a veteran machinist point out something obvious you were completely missing?

9

jakejones•14d ago

Used to swear by manual tool changes, now I'm all about the auto tool setter

Honestly, I was that guy who thought presetting tools was a waste of time. For like 5 years I'd just touch off each tool by hand every single setup. Then last month I had a job with 14 tools and a tight deadline, and my buddy Mike finally talked me into trying his Haimer presetter. Ngl, it saved me almost 45 minutes on that run and I haven't touched a tool by hand since. Anyone else fight switching to a presetter for way too long?

18

avery219•14d ago

Stumbled on a faster way to set work offsets after 4 years in the shop

I kept getting frustrated re-zeroing every part on the mill until I tried using a dial test indicator to set my G54 from a known edge finder position. Cuts my setup time from 15 minutes to maybe 5. Has anyone else dropped the edge finder for this?

7

wadew51•15d ago

Finally caved and tried climb milling on the old Haas last week

I've been doing conventional milling for like 5 years on this machine because that's how my old boss taught me. He swore climb milling would wreck the inserts and cause chatter on our older VF-2. Then last Tuesday I had a job with some 304 stainless and the finish looked terrible, so I flipped the direction out of frustration. Man the surface finish was night and day better, and I didn't break a single insert on that whole run of 50 parts. Now I'm wondering how much time I wasted over the years running the wrong way. Any of you guys stick with one direction out of habit?

22

mark436•16d ago

Lost $600 on a cheap probing system and learned a hard lesson about tool setters

I bought an off-brand tool setter off eBay for about $250 thinking I was being smart saving money over the $800+ name brand ones. It worked okay for about two weeks before it started giving false readings on my Haas VF-2. One morning I crashed a $120 endmill because it told me the tool length was half an inch shorter than it actually was. That mistake cost me the cutter plus the time to redo the part and a broken workholding clamp. I spent another $350 on a used Haimer 3D Taster from a shop closing down in Detroit and it has been rock solid for over six months now. Has anyone else had bad luck with those cheap import tool setters or did I just get a lemon?

22

ray_martinez82•17d ago

Ran a 5-axis program dry last week and watched a $400 tool crash into the vise

I was setting up a new part for a medical device job, last Wednesday afternoon. Forgot to double check my tool offset after I changed the holder, just assumed it was fine. The machine ran the first 3 lines of code perfect then slammed a 1/2 bullnose right into the jaw. My foreman just stood there and asked, "You test your offset or just send it and pray?" Anyone else get that sinking feeling when you hear the machine hit something it should not?

9

piper_kim•18d ago

Blew up a $200 end mill because I skipped the manual

I was running a job on a Haas VF-2 last Thursday in our shop near Cleveland and decided to bump the feed rate without checking the tool specs. The tool grabbed the part and snapped, sending a chunk of carbide across the bay. Has anyone else had a moment where rushing cost you more than just time?

17

riley_wood84•21d ago

Discovered a trick for stopping tool chatter on thin aluminum parts

I was getting terrible chatter milling some 1/8 inch aluminum brackets until I stuck a strip of double-sided tape under the part before clamping. The vibration dampened just enough to get a clean finish on the last 15 parts. Anyone else use tape this way or found something better?

14

knight.felix•21d ago

Appreciation post: Stumbled on a stat that 90% of tool chatter comes from bad feeds and speeds

I was digging through some old forum archives last night and found a guy who broke down 200 chatter failures by cause. It made me double check my last setup on a 304 stainless job and sure enough I was running 15% too fast. Has anyone else had luck tuning by just dropping feed rate instead of messing with depth?

3

mason_lopez•22d ago

Late night at the shop made me rethink my whole approach to tool setup

Last Tuesday I was running a job in Denver and kept having to re-zero my machine because I rushed the initial setup. Three years ago I learned the hard way that spending 15 extra minutes checking your vice alignment can save you 3 hours of scrapped parts. Now I'm wondering if anyone else has a specific checklist they run through before their first cut of the day?

27

the_anthony•22d ago

Dropped $200 on a used Haas tool probe and it paid for itself in a week

Was tired of edge finding every single part manually so I grabbed a used Renishaw probe off eBay for $200 and now I'm setting up jobs in half the time has anyone else had luck with used probing gear?

11

victor_robinson•23d ago

Thought flood coolant was overkill until I lost a $400 insert

Ran a job in stainless on a used Haas down in Tucson without flood coolant for months. One afternoon the insert chipped and gouged the whole part. Now I run flood on anything harder than aluminum. Anybody else learn this the expensive way?

14

bennett.evan•26d ago

Rant: How I used to set tools with paper feelers vs now

Back when I started 8 years ago in a shop outside Detroit I would use a piece of notebook paper to set my Z offsets, figuring that was close enough for anything. Switched to a Haimer probe after I crashed a $4000 part on a Haas VF-2 because my paper feeler gave me a false reading. Anyone else out there still relying on the old paper trick or did you switch to something better?

19

jasonallen•26d ago

PSA: I ran 3/4 tool steel with the wrong feeds for 2 years

Last week I was cutting a batch of T15 at a shop in Toledo and the insert just shattered... I asked this old timer what I was doing wrong and he showed me that I had been running my feed rate about 40% too slow the whole time. Turns out I had the numbers backwards from an old Haas manual I memorized. Has anyone else found out way later that they were using the wrong speeds or feeds on a common material?

17

spencer_coleman•27d ago

Shoutout to the guy who pointed out my tool offset was off by a hair

I was running a job last Tuesday on a Haas VF-2, cutting some 6061 aluminum parts for a customer order. The finish kept coming out kinda rough, but I figured it was just the tool wearing down or something. Then this older operator, Mike, walked by and asked if I checked my tool offset after the last tool change. I told him yeah, but he pointed at the readout and said look closer. Turns out my Z offset was 0.003 inches off from what I set it to. That tiny bit was making my cutter hit wrong and leaving those marks. I felt like an idiot because I've been doing this for 2 years and never caught that habit. Anyone else have a moment where a simple setup check saved a whole batch?