Stub Mandrel | CNC Machining

[@jimsvideos7201]

I adore the simplicity of the concept and the elegance of the manufacture of these.

[@cricketfever12374]

;what about this kzbin.info/www/bejne/f4q6h5-BjNdjr80si=0J9N4pP4ckn8nw1b

[@bostedtap8399]

Excellent work Chris, using banding is a good idea, normally ive seen metal straps between the segments, Ive built a de-coiler once, a lot smaller though. Extension tool holder's were definitely needed that day, love the vibration damper "Thing" 😮. Drawing looked good, plenty of notes go aide in machining and build. Thanks for sharing

[@gwharton68]

Great video. The vibration damper is very smart. At least you don't have to worry about long stringy chips.

[@mftmachining]

Man, Chris, this was excellent. Creativity at its best. I wouldnt have the guts to try such a setup. Hats off. 👍👍👍👀👀👀

[@Donkusdelux]

When the extensions come out, that is when you can tell a rigid machine from the rest haha. great work Chris!

[@ChrisMaj]

Yeah, can't complain about the riggity of this lathe.

[@scania357]

Nice job Chris, that expanding mechanism looks like some tricky matching work. Thanks for sharing.

[@ChrisMaj]

Thanks 👍

[@warrenjones744]

Nice turning job an interesting part Chris. Herring bone gears are a work of art!

[@ChrisMaj]

Yes, they are! Too bad I have never seen how they make them, only youtube videos.

[@cyclingbutterbean]

Beating the shit out of the inserts with that interrupted cut. Well done Chris!

[@ChrisMaj]

Yeah, the machine didn't like it either 😅

[@BruceBoschek]

Love that lathe! Thank goodness for shim stock. :-) Thanks for another fascinating video, Chris. Hope your Sunday is peaceful.

[@magaraoleandro]

Rare wisdom nowadays! Congrats.

[@lancer2204]

Your methods worked, you hit spec. The rest can cry all they want.

[@ChrisMaj]

Yeah, it worked, but don't expect to hit some tight tolerances with that shim.

[@DeadlinePhil]

how does the saying go ? " it ain´t stupid if it work´s"

[@bkoholliston]

Man those tool holder extension blocks are something else! Especially with the added damper. I would have thought you needed a bigger lathe for sure. Very cool to see. Also 4x40 always look so great when you are done.

[@andrewtetley3883]

Great work Chris as always I never got to work on anything so big, we did small end hydraulic stuff. I have to tell you that I got so frustrated through the video….. the drawings kept popping up and I just wanted to spend time looking at them I was they to expand them several times so I could get a better look 🤣🤣🤣🤣🤣🤣 Keep it coming Chris love your videos and the work you do!!!

[@ChrisMaj]

I'll try to include more drawings in the video. It's just that some customers are more strict about it than others.

[@zoltannagy1813]

Nice work on a tricky job... excess tool stick-out and intermittent cuts not making it any easier. Well done Chris.

[@ChrisMaj]

Thanks 👍

[@paulcooper2897]

Wow! A lot of side loading in the carriage!!! Impressive!

[@markfiges999]

Nice job Chris, and again it was'' Kelly Bar City '' 😎😎😎...... as for those who didn't like your method of getting over runout, perhaps they'd like to post their solutions??

[@ChrisMaj]

Sometimes, that shim can make things even worse if you don't keep an eye on it. It tends to move around on you.

[@stevechambers9166]

That was very impressive you do some incredible work 👍👍👍

[@ChrisMaj]

Thank you! Cheers!

[@romanbeck1983]

Great work, great video.

[@sicstar]

Nice work! Love that girthy toolholder extension and yeah ... The shim-plate in the live center, been there done that lol... Can be sketchy af, especially with heavy parts like that but more if you have ones that are unbalanced or take a too heavy of a cut. You are very aware what could happen and gonna have an extra eye on it so all gucci there. Peace! And good job!

[@ChrisMaj]

Yeah, you have to watch that shim cause it tends to move around sometimes.

[@MrKotBonifacy]

_"Love that girthy toolholder extension"_ - Curtis from CEE Australia has got a longer one... I mean, "extension" of course ;-) A monster boring bar from down under tthat never gets boring: Making a BIG Boring Bar, kzbin.info/www/bejne/rpuxeZ2gltOYnsU

[@rubisbiker4482]

Quand on voit l encombrement et la masse de la pièce on se demande comment il va la serrer et la centré et finalement les contraintes d usinage dû au chocs et au déport sont maîtrisés à merveille.

[@tokar035.70rus]

Отличная работа 👍👍👍🇰🇬🇰🇬

[@markanthonysmith413]

Another great job Chris.👍

[@ChrisMaj]

Thanks again!

[@azietxu5779]

Detrás de estas imágenes hay mucha experiencia...💪👍

[@mattiasarvidsson8522]

ppl like you deserve the highest salary in any machine shop.. :)

[@ChrisMaj]

I wish!😅

[@MrKotBonifacy]

@@ChrisMaj Forward this comment to da boss... ;-)

[@peterdupont7559]

Just love that "anti vibration thingy".

[@ChrisMaj]

Patent pending 😅

[@paulmace7910]

Nice work. Thanks.

[@ChrisMaj]

Thanks for watching!

[@manishkainth95]

Ur Idea is amazing to have small shim ❤ in centre

[@CosminyasAlhumbrus]

Now that's a machine shop

[@anthonypoltes7413]

Now that's a micrometer, holy cow!

[@subdude2013]

AWESOME, WELL DONE!

[@ChrisMaj]

Glad you liked it!

[@andrden6440]

Very nice surface finish ❤

[@swanvalleymachineshop]

Great set up & result . I bet the dimensioning on the drawing would have had to had a second glance with the open & closed dimensions ! Cheers 👍

[@proyectosycnc]

excelente trabajo

[@465maltbie]

I am pretty impressed with the insert, considering the overhang and the interrupted cut...Charles

[@ChrisMaj]

They worked surprisingly well.

[@465maltbie]

@@ChrisMaj Would you care to share what grade of insert? Charles

[@ChrisMaj]

@@465maltbie kennametal KC9125

[@charlesblanton1008]

Although designed differently, this looks like what we would call a pay-off reel mandrel where I work. One comes into each side of coil to support while being run through a process, temper mill for example. Just curious if that is the case here and you had a pair of these to do (?). Great work, always interesting to see the machining of the types of components that I install as a millwright. 👍🏻

[@ChrisMaj]

Yeah, it's a slitting line-payoff reel.

[@bhekidlamini51]

Beautiful work

[@Grantherum]

at least with this part, you don't have to worry about stringy chips... that interrupted cut takes care of it all for you.

[@shoppy00]

great!

[@frankd3024]

11:54 Vibration absorber, best engineering 😁

[@ChrisMaj]

Redneck Vibration-dampening thing 😅

[@user-zo7lu9os9t]

做的好，加工這類的成品最損刀具了，做的很完美

[@lwilton]

At least you didn't have to worry much about long stringy chips!

[@ChrisMaj]

Not on this job 😅

[@johnboforsyth5970]

What is something like this used for? Good work as always.

[@CraigLYoung]

Thanks for sharing 👍 dang! How much does the center alone weigh?

[@ChrisMaj]

No idea

[@aland7236]

11:52 Modern problems require modern solutions. I mean if it works lol. 😂

[@ChrisMaj]

Patent pending 😅

[@aland7236]

​​@@ChrisMajWhen I was a teenager I had a 98 Honda Accord, and being a teenager I wanted more faster. I found a brick sized iron (possibly) weight bolted to the front subframe of the car at some weird angle and took it off because less weight is better right. It took me too long of a time to figure out why it was there at all. 😂

[@nono-qh6sk]

Dude, i cant believe the tolerances you have to work with. I saw .001-.002??? Thats nuts! I wouldve thought with something ao big you should have more wiggle room.

[@Nossdreal]

HANDSOME GUY!!!

[@ChrisMaj]

Stop it. My wife reads the comments. 😅

[@MrKotBonifacy]

@@ChrisMaj On the other hand, that will make her aware of the competition and (hopefully) make her rethink her matrimonial complacency ;-)

[@jameswood9764]

Need a counter weight on other side of tool post to Offset long reach adapter?

[@ChrisMaj]

Yeah, maybe it would've helped, but it worked ok

[@KSMechanicalEngineering]

Nice machine

[@changhongmetal]

Marvelous1

[@PROJECTFAP]

Wow that tool post extension and vibration damper is very claver.

[@pulsenpal7882]

did you crimp steel strapping off workpiece to a precision diameter--then slip on when turning?

[@ChrisMaj]

I've put them on the machine to prevent any play

[@renatocesar8399]

Trabalho impecável. Principalmente o dispositivo antivibraçao 😂😂😂😂

[@tricolorbart1980de]

Did you build the holder extension yourself or were they purchased parts? In any case, your video is very interesting and exciting. How many cnmg plates did you use on the segments? nice greetings from Germany

[@ChrisMaj]

All made in the house a long time ago. If you find the right insert for interrupted cuts, they last surprisingly long.

[@TL....]

tak jest

[@TheBonnetq]

How do you get your metal bands so tight?

[@ChrisMaj]

Manual tensioner.

[@465maltbie]

It looks like you used several different extension blocks? Charles

[@ChrisMaj]

For each diameter, I had to use different extension.

[@465maltbie]

@@ChrisMaj Just setting the zero on all those different tools and getting everything to stay true must have been difficult. With those extension you couldnt use the same point for part zero. Your skill is impressive. Charles

[@Kamil_Klukowski]

O matko, dawno nie był czegoś tak spektakularnego. Co to, jakieś sprzęgło odśrodkowe od piły? Ile mogło ważyć to "berło"? Na Porębie ciężko te promienie pewnie byłoby zrobić?

[@ChrisMaj]

To coś tam ma wspólnego z rozwijaniem, czy zwijaniem blachy. Dokładnie, promień na promieniu, ale jak powiesz że trochę za duże na twoją maszynę, to powiedzą że może jakoś zrobisz, bo ja qrwa jestem magikiem.🤣

[@MrKotBonifacy]

@@ChrisMaj "Niemożliwe robimy od ręki, ale na cuda trza parę dni poczekać", jak to mówią...

[@BMan100]

that tool holder extension looks like it's been sitting in the back for some time.

[@ChrisMaj]

Yeah, it's for a special occasions only.

[@jaca2995]

Ja piernicze ale robota, chylę czoła, pracuję na maszynach konwencjonalnych i podziwiam Pana pracę ;). Gdzie Pan pracuje?

[@ChrisMaj]

Za wielką wodą, przedmieścia chicago.

[@hinz1]

Would be quite a bad crash, if that steel band had ripped apart ;-)

[@ChrisMaj]

It wouldn't really fall apart. It just has a little play in it, and that keeps it tight.

[@wmitchell51]

This shop looks familiar to me, is this in Tomball?

[@ChrisMaj]

Chicago suburbs.

[@LOOKATTHISRAFFF]

And now make a mistake, I don't even want to think what those losses would be

[@ChrisMaj]

Let's not go there 😂

[@erikslagter3231]

oh man those wooden pallets at the lathe are giving me the creeps.. One wrong step and you're out for a week..

[@ChrisMaj]

The space between me and the machine behind me is a bit tight, and they have to squeeze in with the forklift. Every time I would replace the pallet, he would crash into them,so I was like "fuck it"

[@mikeb1520]

You work on some of the weirdest $hit. I thought I worked with unusual machines during my career, but I don’t think I have seen anything remotely like what you seem to come across on a weekly basis.

[@ChrisMaj]

I think that's why I'm still here in this shop (27 years). All this different shit they throw at me, 😅

[@Michal_Sobierajski]

Mam wrażenie, że nie potraficie robić łatwych detali :D

[@ChrisMaj]

Przynajmniej się nie nudzi.