CNC Turning 4140 Steel Pin

[jmilligan151]

you should have made some jaws with a step in them for the back of the billet to push against. 2 minutes of machining that would save you heaps of time per part. otherwise very well done

[Lehto92]

@jmilligan151

At the very beginning of the video you can see that there's a step in the jaws.

[dougspair]

Are you making a forklift steering axle spindle?

[logtut1990]

are you starting with TGP??

[Scoopy4444]

What do you like , working on NC lathe or conventional one ? I really like conventional.

[donepearce]

I saw sparks.

[GeneralG1810]

I use to love this stuff, we'd give it the new aprentices to machine and tell them it was mild steel >8-)

Another one was Nickel ally bronze and tell them it was brass

I know Im a bastard hehehe

[antboy824]

Beautiful finish. Also that "apologize" song by One republic is playing in the background if you listen carefully.

[EruditeCanadian]

I love 4140... It always finishes so shiny :)

[extremenj18]

that tool probably got worn really bad

[soundspark]

@extremenj18 4140 is butter compared to what I machine at work. Where I work, we machine hot rolled 52100 bearing stock, which eats up inserts real fast.

[johnstonebreaker]

@soundspark 316 and 304 SS REALLY eat the carbide up! Give me any kind of (non SS) steel ANY DAY!

[alby2317j35]

Great work and also the chip control and performance, with that speed (RPM) are working.

[motogpphil]

I don't want to come across as a youtube hater but purely going on visuals I'd be running a way higher feed rate on roughing (perhaps less rpm too more feed= high torque). Perfect chips though. ok no coolant...i get it..fanuc canned cycle obviously!

When I was an apprentice I asked my teacher "how far should i hand the boring bar out"? to which he replied "till your licking the paint off the holder!".

Good job. Good vid!

[motogpphil]

@motogpphil

less rpm high feed low gear= high torque, just to clarify...

[kev8338]

Excellent finish!! No matter what, it never gets old touching a freshly turned, mirror finish piece!!

[douro20]

I've never seen anyone machine that close to the chuck before- from the video it looks like 100-200 thousandths from the jaws.

[KCNC1]

@douro20 The top of the chamfer actually comes within 0.5mm or 20 thou.

[Bobtheguitarist]

@douro20 really? its not uncommon that i end up running jobs that go less than .050" from the jaws or .025" from the tailstock center...keeps you on your toes on the setup part that is for sure :)

[Yamahayz250fmx]

Nice vid.

Im guessing thats a Mazak Quick Turn of some sort .

I guessing because at 3:23 it has the same Blue colour of the older generation models and the door slide looks the same as ours at work.

Cheers!

[KCNC1]

@Yamahayz250fmx Nah, its a Daewoo Puma 250. About  year 2000.

[abarabaa]

what steel typ is this ?

St52 or CrMo 17V

42Cr ??

[KCNC1]

@abarabaa All I know is it's 4140.

[13337deluxe]

@abarabaa 42CrMo4

[ripgutcanibals]

why are u ruffing it out with such a slow feed rate

[KCNC1]

@ripgutcanibals So it doesnt slip in the chuck. And the small batch didnt warrant extensive experimenting.

[timbo1208j]

@KCNC1 i have never seen a part slip in the chuck while using a tailstock, how much pressure did you have on the tail stock? and what are you feeding it at?

[johnstonebreaker]

@KCNC1 Got chuck problems? That is some really frustrating shit! Been there!

[antboy824]

Haha could've fed faster and made .100 roughing cuts.

[Tome4kkkk]

Machining porn :)

[sophanay]

could you tell me what spindle rpm, feedrate ,and depth of cut? thank you

[sophanay]

@sophanay 

[hurius]

what was the purpose of that "stick"

[buddhaboyd]

What kind of Insert are you using?

[Infeliz08]

what kind of feed rate and rpm you are using?

[KCNC1]

This was running at about 200m/min and .3mm/rev feedrate and 4mm deep cuts. These days we run at 280m/Min,.35mm/rev, & up to 6mm deep. 3 parts per edge.

[lmanon1]

What depth of cut is it taking I wonder?

[KCNC1]

This was 3 or 4mm deep cuts. (6 - 8 on diameter)

[jmilligan151]

@KCNC1 that doesnt look like 6-8mm on diameter. id say 2mm on radius

[YoungJim409]

That pin in that chuck, stood upright with a piece of glass on top, would make one hell of a coffee table.

[cixbull]

open coolwater

[brujoezln]

what are the revolutions and cutting speeds for this cuts? do you know a good site to start learning about highspeed machining?

thank you ppl

[KCNC1]

Try Sandvik Coromant and other carbide tooling sites for up to date data. We have since improved this job and similar shafts with deeper cuts and higher feedrate. 280M/Min and .35mm/Rev and 6mm Deep cuts. "Steel Rain!"

[LowRoller420]

you can't do that on a Haas.

[sherdo37]

@LowRoller420 , yeh ya can, ive done a job for mclaren for years , out of solid titanium, 4mm depth of cut , .35 feed rate, spindle speed 40, dont go above this! using iscar ic20 grade, cnmg style tip. was pushing it to the limit , but it done it no prob.

[WarpToken]

@LowRoller420

I do bigger cuts than this on a haas every day.

[walssin]

Great retraction of the tool!! It just went zoom..

Awesome video.. I have the programming part for my exams.. The video helped me to understand the practicality.. Thanks..

[bunter76]

thought there mighta been a wee bit of chatter there by the sound of it but sounds like the 4140 cut you you a bit of slack...

[Amel3]

isnt 4 mm cuts too much for that maschine?

[bunter76]

you could take 1/4 inch cuts with the right tip ya slacker!!!

[ydna2]

Perfect chips!

[gummel82]

@ydna2 mmh chips

[Ju5tATh0ught]

that's quite a dent you've got in your back guard...

[Smartass365]

@Ju5tATh0ught Chuck wrench maybe?

[KCNC1]

@Ju5tATh0ught - First job I did on the new machine came out the chuck and wrecked the door, made that dent and various other things that made me cry...Was a D200 x 300 piece of steel, the chuck jaw bolts broke.

[jeetendrag10acc2]

@KCNC1 awwww..there there...don't cry....

[tbmac86]

is that one republic and timberland apologize?

[Ripvansteel]

Whats a matter you afraid to take a real cut!

[buggable]

And what would be the benefit? Not finishing ONE roughing cycle with the insert? It looks alright to me. Just listen to it. This is rather hard steel.

[22j77]

@Ripvansteel Check how much he's chucking on. Set the custom load monitor and run a second machine. I usually go to the limit but sometimes it's better to just let it run smoothly and walk away from it to run another machine. With the load monitor the machine will stop when the insert breaks or chips.

[korbokor53]

biz daha atelyelerde eğe atip duralım adamlar neler yapiyo

[Joilung]

i see sparks... is that normal when lathing a 4140 steel?

[trein45]

Sometimes yes but, normaly not

[imms74]

painfully slow!!! and 4140 is nothing crazy to machine.

[KCNC1]

Yes, it is actually quite good to machine with correct inserts, nice finish etc. We were getting 2 parts per edge, now with higher speed/feed we get 1 part per edge. We save just enough time to warrant the time lost to change the insert and still be more productive.

[rdgtm]

Nice video.

[lexichronicle]

if you think this is running slow, have a read about what 4140 is first

[KCNC1]

Similar to 4340 (CroMoly). Also, the quality varies as there are many states 4140 can be supplied, ie. different hardness. In Australia you never quite know what you will get when you order 4140.

[lexichronicle]

I'm quite into bike frames and know that 4140's properties tend to move around a lot depending on where it's coming from - everyone seems to have their own variation. Regardless, it's usually got an extremely high tensile / ultimate and so won't pour off a lathe like 6061 - was what my kind of crypt message was meant to say

[iasi0232]

slow motion...

[trein45]

You can now see that no everithing can be done fast. The material you're machining is different so even the speed of machining the product is different.

[lockgessner]

what a bunch of production da's... when yall gotta make less than ten of one part outta 4140 and you holdin on to practically nothing come back and talk!! I would bet he has just as much time in the setup as he does the actuall machining of 5 parts!! If yall ever get in a tool room where time doesn't really matter, only precision and not f'n up the part you'd understand.

[KCNC1]

Exactly, why spend another hour and risk ruining a piece of steel to speed up a job which may save 15 minutes for the entire job?

Also, pushing harder can risk burning out a roughing tool before finishing the operation.

That said, we have since sped the job up with deeper cuts and higher feed rate.

[mwhiggs]

better to be safe than sorry..good demo could of changed depth of cut though and feed rate. if you have good tailstock pressure and chuck pressure that part wont go anywhere..i would of had that part around a 7 to 10 minute cycle time..

[4YOUR2MOTHER0]

yeah not to throw a downer on your video but it is plenty safe to up the feed to almost a

G00 lol, atleast during the roughing cycle. during the finishing cycle, you should knock up the speed to about 2500 and keep the feed in the vid. :). oh yea and M08. :)

[KCNC1]

Yes, my first video is not terribly exciting!The job is appropriately cautious as we are holding on by 7mm and it is high tensile steel. When the job is only 5 pieces, you dont tend to muck around with cycle times as much, main thing is not to stuff any up. Eg, save 5 minutes/part=25 minutes for the job- woopy do.

[kaninen25]

I still don't quite understand why you don't use the coolant, it helps a lot of the precision (keeps the metal cool and avoid expansion) And i know a lot of the heat goes away with the chip, but better to be safe then sorry, those tools aren't cheap if you break em :P

[KCNC1]

We do use coolant, but we wanted to video with the door open, made enough mess as it was!

[PiereSmirnoff]

yeah, that can realy go faster!

[turboman865]

I hope you don't mind but i have downloaded this vid as it helps me get to sleep, it's just so borring. come on step it up a notch

[jmccalip]

Baahahahahaha

[tokay444]

dude, it's already sparking and creating enough heat in the tool holder to evaporate coolant drops on the back side of the holder.