Very impressive Chris. Upside down tool to reduce chatter you say.... interesting. I turn away from the Chuck but I'll try this out of curiosity. Fantastic job. 👏🏻👍
Even after indicating the part it still seemed out of round probably the raw material out of round. But that’s a lot of turning how long is the cycle time? 4 hours lol?
Tbh what amazed me more about this part is the fact that it didn't start to shatter in the middle that seemed like a lot of stick out even with tailstock support.
@@kisspeteristvan I don't know if I just got used to this place or what. No, I mean this place is alright I have a pretty decent machines, no one is breathing on your neck all the time. There are some crazy days, but I guess that's everywhere and it's close to my house which is a big plus.
Very nice video Chris.The dimensioning and showing the stress relieving of such a long part was spot on. To also show the acceptable runout on the finished part was very informative to those who turn outside the realm of your big parts. Most people assume that a CNC lathe or mill naturally turns out work accurate to tenths of a thou. over huge distances with out any help at all.
Cutting Edge Engineering just recently had a video with a problem piece that warped after roughing. It apparently happens more than expected. Great results with a problem child!
@@ChrisMaj I adopted a term from Kurtis' video, and I said _"Now Chris is turning a banana!" (albeit a really long one in your case)_ 🍌 _Great job on the finished product! I nearly stood and applauded when I saw the orange 6.001 to 6.003 dimensions!_ 👏👏👏
I've never seen the dead center in a back chuck approach, and I'd definitely have done a double take if I'd seen the part merrily rolling along with the jaws on the front chuck hanging open like that.
I do this all the time with something this long as long as it fits through the spindle bore. There is no way to indicate the end of the shaft in the spindle, so by using a center I know I don't have any runout.
Fantastic result and video Chris. Noting the chips, I'm assuming 4140 or 4340 or some similar alloy, bitchen chip control verses tool push at such a spectacular thickness to length ratio. Respect. Please stay safe and keep showing us your skills.
@@ChrisMaj Did you do the finish cut straight to the final dimension or did you do one or more finish passes to make sure to get the diameter and taper correct?
Jak to możliwe wykończyć tak długi wałek bez wibracji itd ja próbowałem zrobić 800mm długi do średnicy 24 mm z 45 mm i wibracje miałem i nieładne wykończenie porażka
Good job. You have a good machine and tools. The real challenge is to work the 316L stainless steel boat shaft, 120 mm in diameter and 5500 mm long, with non-normalized material and with a manual machine. I use a 3 steady rest to turn such a shaft. In the process of making, I do not have the possibility of relieving stress in the material, but I use fire correction methods and the pinning method so that I can do a good job. the classification society requires a tolerance of 0.02mm to 6000mm in length.
I machined a very similar part but the material was Monel K 500... I noticed the part was sagging in the middle between the chuck and center a good .010- .015 thousands... I'm curious did you have the same issue and if so how did you fix that issue .
Well done Chris, very nice bit of work... I'm guessing you have done a few of these now, with your knowledge of the job... I think I'd be bricking it doing that for the first time & there are no second chances. You also seemed to find a solution to the vibration on the finish cut too by running it LH... All in all you know your machine very well and what works on one machine might not work on another. Class work Chris I hope they pay you well for your skill 👍
I've been running this lathe since they got it brand new about 15 years ago. As you said, after a while you know what she can or can't do and it does get stressful sometimes but you just try not to think about and hope you don't f- up anything.
As you can see in the video, it runs straighter than I thought. When I saw the drawing for the first time I was like there is no way I can hold this tolerance on 127 inches, but I guess she (the lathe) still got it.
@@ChrisMaj Здраствуйте,я и сам работаю на токарном чпу,посмотрел уже не одно ваше видео,очень нравится ваша работа.Сам я с длинными деталями не имел дел ,поэтому вдвойне интересней.
Wow. Wish you were close to houston i could learn a thing or two from you. So i guess you left it with stock and then stress relieved it before finish? Crazy just looking at how long that thing is i would think it would chatter or push off in the middle.
Kolejny świetny film, jak i świetnie wykonana robota. Oczywiście oglądałem z ogromna przyjemnością. Co byś powiedział na jakiś timelapse z obróbki zgrubnej? Myślę, że świetnie by to wyglądało. Pozdrawiam :D
No mam nadzieję że oglądałeś wszystkie 🤔😉. Myślałem już nad tym time-lapse parę razy, ale moja robota to przeważnie pojedyncze sztuki i moje filmy to przeważnie kawałki poskładane w całość. Żeby to był mój biznes to bym mógł ustawiać statywy z kamerą i jakieś fajne ujęcia kręcić, a tak to tylko w między czasie coś nagram.
@@ChrisMaj Oczywiście widziałem wszystkie twoje filmy. :D Dla mnie nie ma sobotniego poranka bez twojego filmu i David Wilks, obaj robicie świetna robotę.
@@adam-1112 On zawsze się śmieje ze mnie że CNMG płytki tokarskie są moje ulubione a on ich nienawidzi. Nawet w dzisiejszym swoim filmie @1:50 właśnie wspominał.
@@ChrisMaj Słyszałem to jak wspominał o tobie. Znalazłem nawet film, w którym David mówi o tym nożu ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-5L_P4Pa-MjI.html Jestem ciekawy jak się do tego odniesiesz.
@@adam-1112 Moim zdaniem przyczyną tego są luzy w maszynie. Jak zauważyłeś prawie w każdym filmie używam tych płytek tyko większy rozmiar i jeszcze nigdy nic takiego mi się nie przydarzyło. No chyba że płytka jest bardzo stępiona to może zacząć odsuwać narzędzie.
It may reduce chatter but with material like 4140 you will be forcing the material to run true following the steady as the stresses in the material is released.I believe the way Chris machined it is the best way as stresses relieve you are constantly truing up bit by bit until it's in it's free stage with minimal run out.
@@mehmettemel8725 Yeah you're so right about the follower rest. It might help with chatter but then you release the follow rest and the run-out is all-over the place.
@@ChrisMaj You don't use it for roughing. You use it for finishing. Finish cuts are where you really need to worry about the chatter, and finishing doesn't move a part much if it has been properly stress relieved. So yes a follower rest would have helped prevent chatter while finishing using the tool in the normal orientation, but turning the tool upside down and running in reverse does the trick too. This gets rid of the tendency for the cutting tool to generate lift and try to fight gravity, which can set up a bounce. Cutting upside down just applies force in the other direction and gives gravity a hand instead.
Yeah, I get that comment all the time. I don't know if it's the coolant that we use or what. It turns into that milky color within couple of weeks after replacing it. At least it doesn't smell.
@@ChrisMaj maybe it’s just the camera or lighting, or maybe it’s the rust and scale off the raw material you’re machining. I assume it’s mineral based? Maybe switch to synthetic or semi-synthetic? I’ve just bought a drum of full synthetic and now my way covers and guards are all rusting up, so maybe go semi-synthetic. I’ll never use full synthetic again. It’s blue too, cutting fluid is not supposed to be blue... haha
I love how this machining segment is so interconnected . I've seen 2 channels that i watch , just in this small comment section :D . Also that part seems quite challenging .
