How I Deal with Long Shafts | Lineshaft Rough & Finish | CNC Machining

[@pops9049]

Not only did you combat the sag from the weight, but you took into account that the material would move as soon as you broke the 'skin' and released the internal stresses. That was a great example of turning.

[@ChrisMaj]

It might seem like a lot of setups, but that's the only way to keep it somewhat straight.

[@IstasPumaNevada]

@@ChrisMaj Feels like it's that way with a lot of quality/precision tasks; most of the work is in the setup, and it's vital. Like with paintings/coatings; 70% of the work involved is preparing the surface before you even start painting, and most premature coating failures are due to improper surface prep.

[@ianm1470]

Managing to keep the total runout of the shaft to .010’’ shows your knowledge and skill ~ great job well done 👍🏻

[@nickj2508]

Thank you for also sharing the completed sub assembly. it is cool to see where it goes.

[@Lathe.Lab-vc3td]

❤👍

[@brianbures4478]

With the piece supported by only the centers it is going to sag with the shear weight of the piece . You did a masterful job in keeping it as straight as you did !!!

[@Lathe.Lab-vc3td]

❤👍👏

[@brucejenner5856]

Wow, I didn't know such a detail existed on a tailstock until I saw the small size of the handwheel! Great work, your videos are very informative and impressive to watch.

[@brucejenner5856]

I agree with you there. Such a long workpiece is bound to have locked - up stresses within, and no matter what machining strategy you take, you will always have run out on completion.

[@johnlawler1626]

Great example of shaft work for young machinist, its all it the preparation, and if you rush in without taking the time to do it right you'll end up chasing your tail...nice piece of turning, thanks for sharing 👍

[@un-factory]

The work process is amazing.😊😊😊😊😊

[@ICA17887]

Thank you Chris for this superb video of machining a large axis, you have to be a pro to obtain such tight concentricity over such a length 👍💪Happy Sunday

[@gwharton68]

Looks like a drive shaft for an old Shea locomotive. Always a great video.

[@Lathe.Lab-vc3td]

❤👍

[@bergermeister9122]

Have you ever hot-spotted a shaft to get it straight? i know in some materials you cant, but 1045 should handle it fine. I turn 16 foot 10 inch 304 stainless shafts, and after roughing they typically run out .050, so i hotspot it straight, and it will only run out about .001 or .002 when im finished.

[@ChrisMaj]

I've never done it, but we used to have a guy who was really good at it, so I have seen it how it's done. This is one of those things that you better know what you are doing, or you're gonna make things even worse.

[@aerialcat1]

I like that you show how the part is to be employed.

[@BruceBoschek]

That is really impressive! Thanks Chris. Have a peaceful Sunday 😊.

[@bigbattenberg]

Very awesome series of videos. So much to learn here. I will be starting a new job in heavy machining and casting very soon but my employer has NDAs with all their customers so nothing can be shown to the outside world. I remember that Peter Stanton from Edge Precision had to take down some of his best video series because of non-disclosure issues.

[@TexDrinkwater]

Seeing the finished part, I'm guessing that a few thousandths runout won't even be noticed..

[@ChrisMaj]

1/8 of an inch would have been still fine 😂

[@dmbworks8094]

interesting thank you.. i picked up a lathe with 39" of travel, a lot for me coming from a screw style machine. i am eager to make some longer parts.

[@steel.machinning8675]

Saludos desde mexico, me encantan los videos que sube👍. Es una gran aportacion la que hace con este canal y mi parte favorita del video es el montaje de las piezas. Tambien me gustaria ver como centra las piezas con esa prescision pero se que serian videos demasiado largo. ❤

[@brucejenner5856]

Hello again Mr Maj. Did you pre-face the end of the shaft and centre drill it? Has the tailstock of your lathe got a reduction gearbox on it for increased pressure? What diameter is the headstock spindle?

[@ChrisMaj]

The face and centers were done on a horizontal boring mill. Yes, the tailstock has two gear reduction . There's 10" bore through the spindle.

[@bigbattenberg]

I am puzzled still about the setup with the center in the back chuck. It looks like you have it between centers all the time. So, when using the front chuck, the part is over-constrained by definition. It is practically impossible to not bend it when tighening the front chuck jaws, or do you actually bend it on purpose being guided by certain runout numbers? Great content, thanks from Holland.

[@rickrozeboom5585]

Nice work! Do you always get your material with the center already drilled? And how would you handle this piece of steel without the centers drilled? I am very curious to see how you approach that. Greetings from the Netherlands.

[@adam-1112]

13:45 w poprzednich filmach dawałeś pokaz umiejętności zostawiając element z kilkoma setkami bicia 😊

[@adam-1112]

Bardzo chętnie zobaczyłbym, jak ustawiasz coś w tym uchwycie. Najlepiej krótkie i bez podpierania kłem 👌. I oczywiście film bez żadnych cięć😁😁

[@ChrisMaj]

Parę razy udało się utrzymać lepiej, ale ten materiał jakoś walczył ze mną.

[@Coleen_West]

Really nice work! -- QUESTION -- What make and model lathe is that? I couldn't tell from the video but it looks awesome!

[@ChrisMaj]

Hankook PROTEC-9NC

[@Coleen_West]

@@ChrisMaj ..cool... Looking it up..

[@Lathe.Lab-vc3td]

👍👏👏

[@neilmchardy9061]

Did you do turning towards the tail stock to reduce vibration? I found it very helpful to do it that way.

[@Cornpop1234]

Nice shaft what kind of machine is it for with those big bevel gears?

[@ChrisMaj]

Here is a similar job kzbin.info/www/bejne/i2SbpIuCd5ySrM0si=LTeGYjw2d0Iksrxw

[@allenvego1]

How is the shaft spining when the jaws are not touching the wprkpiece ? 🤔

[@kenhawkins1033]

I'm curious about your tool geometry selection. I would've likely stuck with the 80-degree diamond or trigon throughout. What advantage does the 35-degree diamond provide for the final passes?

[@beni_122]

With the V plate, the cutting force is smaller and the tool is pushed away less. In addition, with a lower feed rate and a smaller chip depth, you can break the chip more easily with the V plate than with a C plate because the chip breaker is located further forward. This is my opinion why you should use a V for finishing. I think opinions differ there

[@kenhawkins1033]

@beni_lie.1282 Your reasoning makes sense. Anytime you're dealing with an extreme diameter/length ratio, every little bit helps. And I doubt a sliding headstock exists to deal with the shaftwork in this video!😝

[@smoke3090]

The problem with using recycled material is the residual stresses they have due to deformation in their previous life.

[@n.b.p.davenport7066]

Nice machine

[@semperfidelis8386]

ya, now is that scrap or what? How you gonna hold .001 with all that runout?

[@nichitacovalenco]

Chris, hello. Do i understand right that you support the bar with jaws opened using second chuck at the back of headstock (if i can say it this way)?

[@ChrisMaj]

This video explains the center in the back chuck a little better. kzbin.info/www/bejne/mmrPlqWGaN6rZqssi=VuEBP_ErZOOBM7h2

[@nichitacovalenco]

@@ChrisMaj, thank you

[@TSMundora]

What is the brand, grade and chip breaker of the CNMG insert that you are using?

[@ChrisMaj]

Seco TP2501

[@adam-1112]

Znikają mi moje komentarze. Chyba 3 razy to samo pisałem :(

[@ChrisMaj]

No ja nic z tym wspólnego nie miałem 🤔

[@cc88000]

👍👍👍🤘

[@tornaciyiz]

chatter .?

[@Lanell-ru9ob]

Watching this video made me realize I should never complain about my short shafts again! 😂

[@sxslayerxs]

First of all you had a boring mill face and punch the centre on one end. Don’t be lazy it’s a everyday job for a lathe guy to do this on bar stock. And there’s better ways to do this than you showed.

[@ChrisMaj]

I have many more important things to do than fucking around with the centers, when they can do it on a mill in 15 minutes. There's always better ways to do things.

[@DavelyDriven]

That's what she said

[@465maltbie]

When you are checking runnout with the chuck open is the back chuck already dialed in? Or is there some kind of center in the dead end of the spindle? Charles

[@CNC_Machinist]

Good Question 👍

[@ChrisMaj]

I do have a center installed in the back chuck

[@carltauber2939]

My question as well, thank you for asking.

[@465maltbie]

@@ChrisMaj Thank you.

[@dmbworks8094]

you can see the center in one of the last clips.

[@CncFrezar]

Super!👌

[@n.b.p.davenport7066]

The machines that make the shafts for the ships propellers😮

[@parnuzutech]

Listen process

[@ИгорьСухов]

Классец !!

[@a222parker]

Super cool. Thank you for your videos.

[@michajasina7418]

Coś to za luśnie dorwał maszyny ci zbraknie jakie to jajowate dziadostwo , chyba stopami to było walcowane 😁😁😁😁😁Lublin pozdrawia

[@aquilaaudax6033]

✋🏼🇦🇺👍🏼

[@n.b.p.davenport7066]

If I had that metal lathe that's how I would handle my long stuff

[@IstasPumaNevada]

"With practice and patience. Also lots of lubricant."

[@Lathe.Lab-vc3td]

👍👏👏

[@richardmills5450]

2 questions. What was behind the chuck turning the shaft? Is the 10/11 thou acceptable run-out ?

[@Daniel_en_el_trabajo]

nice job, what is the tecnical name of that type of flange? its strange the 4 alen bolt with like washer with a key? or is not a washer is a nut, but if you have a key you can not tight that nut, oh the flange is thraded, but i dont understand the lock system, sorry for my english

[@ctrhenry]

dnmg 15-06-08R-K inserts are great for these long shafts

[@clkeck1]

Did you happen to check it after the keyways were cut?

[@Paul_Kair]

god bless that i dont need to work much with inches :D

[@GeorgeWallace-l1s]

NEVER use a dial gauge on a rough surface

[@ChrisMaj]

It's a cheap one just for this.

[@larryperdue508]

My first introduction to machinist was a job were my dad worked and I was just a helper till I got in trouble for watching 👀 in the machinist department so they made me chip cleaner and I learned so much that was best thing that happened to me 😊

[@LOOKATTHISRAFFF]

Great job as usual

[@derricksettles8417]

I would enjoy a collaboration video between yourself, @Abom79, and @edgeprecision