Thank you Chris for this great machining video. I love carving with the Kennametal knife tool in slow motion, it makes nice big blue shavings. Have a good working week and see you soon.
I’ll bet you the guy that drew that part up originally never imagined that a computer controlled machine would be cutting those radii so smoothly. Nice work.
@@matiastripaldi406 There's always a way, but it'd involve some pretty unusual tooling. Probably a fourth axis, rotating vertically on the carriage, provided the required radius is perfectly circular. Imagine something like a "ball turner" tool for a manual lathe, but used in the opposite way. If it's an oval, or some other more complicated shape, you'd need a fifth axis mechanically linked to the fourth with some fancy variable linkage that would have to be adjusted for the shape. Thank god for CNC, i guess!
The steel mill environment is really rough on the equipment. The things that are coming in for repairs, sometimes I'm like, how the hell did you manage to break that.
To be fair, there are some applications that require very tight tolerances in the application and use and a tool mark could push those tolerances out of wack...however, those have to be VERY tight tolerances and usually seen in very specific applications and industries (Formula One engines is one example).
usually tool marks are eliminated after grinding and polishing so i fail to understand why he doesn't leave an allowance for grinding . or they just dont have grinder for it
Half a thousandth tool mark will cause an 8" shaft to sheer ... sure thing bud! I read those notes as a cheap guys way of trying not to pay full price when you are done the job. "Doesn't meet the specs I gave you." Beautiful work as always! Thanks for sharing 🇨🇦
One surefire way to bring these people to their senses is to add extra for grinding/honing/lapping the part to remove tool marks. 99% of the time you'll hear - fine, just keep it to the minimum possible. That; 's their way of acknowledging their stupidity. BTW, this part is just a pusher, not some ultra-critical clearance application. A couple of toolmarks will in no way interfere with its function.
Great video Chris! Nice to see the ole lathe eating that material for breakfast. Was waiting for you to set up a steady rest and face the part to length. Leaving some meat for the mill in the end was probably for the best. Cheers from the land of oil and gas in Canada 🍻
When I saw that first cutter, I knew big chips would be flying. I looked at the screen and saw that the lathe was only at 83% with that depth of cut. Truly boggles my mind how an insert so small can do that lind of work.
Yeah, I was just messing with that tool marks cause years ago we had that one inspector, and he was really picky about surface finish/ tool marks. He would use his fingernail and be like " that's not gonna cut it, polish it more "
Man i wanna make big parts like this...I run a Hardinge mostly, small titanium parts that are like 3-5 inches long lol. Thinking of going to another shop next year potentially. I wanna learn to run cncs cause all I do is manual work like honing, flat lapping, finish grinding, match lapping, roll lapping and Hardinge for finish lathe work that requires +/- .0002 work. Watching you turn this was so cool idk lol, though my heart stopped for sec when you showed the print...parts I work on have that ITAR stamp soooo I'd probably get fired if I showed it lol.
Всегда прохожу болванку первым черновым проходом, убирает биения и ржавчина потом не летит при последуещей обработки. И на обдирке по возможности использую левые резцы и обратные обороты, что бы семечки летели вниз.
Great work as usual Chris, is there any chance you could add the time to produce the component floor to floor including programming? Thanks in advance.
Я был мастером механики после технаря У меня дед в бригаде был токарь за пенсию Никогда не люлил чистовую Ставил режимы так что бы стружка аж до светильника доставала летела Диверсант Соседи по цеху работать не могли
What depth of cut were you running on that fix8? I see 300 sf and .032in/rev but couldn’t tell from the code how deep you had the insert in the material. That thing looks like a monster cut
I assume your finger nail is calibrated at a hardness lab after every trim. When I worked at a gas turbine overhaul company tool mark (or any surface marks for that matter) removal was extremely important. In aircraft engines the parts are highly stressed so they can be as light as possible and are therefore susceptable to crack formation at stress concentration points. Much time was spent with Cratex sticks smoothing out radii etc. Even grinding surfaces was problematic as certain materials are subject to grinding burns which can lead to crack initiation. These grinding burns are invisible to the naked eye and only show up when etched with nitric acid. The surface will look perfectly smooth but be burned and unacceptable for use. The parts you are making, while likely subjected to huge loads, are very heavily made and probably develop relatively low stresses in the material. While tool mark removal is good practice, it likely would make little difference on this part. Ken
Hi, again I am wondering, is the center in de main spindle (slightly) floating and only used as an axial stop? Because it would be over constrained with a fixed center, you could be doing huge damage clamping the jaws unevenly. Great removal rate BTW. At work I was discussing milling vs. turning for hogging out big parts, because the Mazak VTC does not lend itself well to high removal rates, one of our big lathes will do it much quicker. Also it appears the chip thinning milling strategies do not work equally well on different machines.
@@ChrisMaj Thanks! Do you mark the deviations on rough material and make sure the numbers don't change while tightening the jaws? Normally a drive dog would be used between centers but for large work this is probably not an option.
I have the same machine and have a job coming up in the next couple days. It is 9.625 soild 316l bar stock I have to turn to 9.000 +0.000/-0.008. It is 208.250 inches long. I also have that same tool. What kind of feeds and speeds would you start running that at?
@@ChrisMaj спасибо ,это видео все объясняет .Видимо я его не смотрел ,так как недавно на вашем канале.Очень интересный у Вас канал ,смотрю с удовольствием .Если честно ,я таких резцов ни разу ещё не видел ! Удачи Вам в развитии канала ! 🤝👍
"Let's be realistic, This thing did not break because of tool marks." "But all tool marks must be smoothed" obviously the new engineer covers all his bases. It looks pretty too! Shuffle blame from design to manufacturing. From manufacturing to maintenance, from maintenance back to design. Welcome to Boeing. Why did it FAIL. The design did not account for reasonable maintenance and manufacturing flaw allowances. "The reasonable test" And what is a reasonable engineer to do, cover those bases in design. DESIGN FAIL, PERIOD, or maybe a rough finish as well. Or lack of maintenance. Needed more grease as well. Probably needed the newer flux capacitors installed as well.
How is it a waste of material? Yeah, we could have used a forging, but it takes a long time to get them,and in repair, machine shop time is what we don't have cause everything is a HOT JOB
