Fire-able Offense --- CNC Trepanning and Rope Threading on the Okuma Lathe

This is a long running job that we run different sizes of in our CNC Turning Dept. This job took a while to dial in but now the parts are getting done and inserts are lasting. We developed the threading tools and trepanning tools. I have this job dialed in pretty well in the video.
Use CNMG inserts for facing using the 100deg corners. I have many used inserts that I can reuse using this facing tool plus the bigger deg edge holds up a lot better. After that we have my father's design CNC Trepanning Tool designed specifically for this job. The bore is 2 7/8" dia and the slug is 1 7/16". Many pieces of extra material that we usually just drilled and turned into chips. Now we have a lot of very good quality material left over.
The biggest challenge was the fat threading. Inside Diameter Rope Threading. Unlike the fat outside thread I designed an insert and holder with the shape of the thread profile and used standard threading operations. I lower the speed of the rotation the deeper the tool cuts. I get about 200 parts or more per insert.
Many of the tools you see are soon going to be up for sale on our new website. Working on it now. I will let you know when it is ready.
Low speed and many cuts but cutting the thread runs smooth

[@ActiveAtom]

Hi now that is one styling set of custom vise jaws, another reason we need to still learn how to use this welder we bought 3 years ago. Looks like coolant through everything though just funnin. Really nice internal threading work, big ass threads at that. Thank you. Lance & Patrick.

[@zalamachineshop]

You gotta be very very very very careful when welding jaws. Many machinists will say it's a big no-no. I trust our welder plus we chamfer the edges so there is deep penetration on both welded surfaces.

[@userwl2850]

I'm almost ready to start work. I'll see you soon. Through coolant. Happy New year to you all. 👏🏻👏🏻

[@dimehbonics9974]

Awesome Job!! 👍🏻👍🏻

[@user-ce6gt8lq8k]

Very good job!

[@t.d.mich.7064]

The fit is definitely "somewhat loose" ! You achieved your customers request!

[@sunppaa]

Awesome!!

[@stacysimon8864]

Well done sir.

[@SuperYellowsubmarin]

That thread is a serious job !

[@zalamachineshop]

Big job of ours. Got them running about 5 years ago and still use the inserts and tools on the daily.

[@bob778_6]

Adding in notes like that can be very useful especially if you are getting another Machinst/Apprentice to run the job who just need a little reminder of what the process is and what action needs to occur next. We also have a note telling the Apprentice to stop deleting a specific program in the machine that he deleted a few times while he was still learning lol.

[@pyrobeav2005]

Add notes for your own sake when you need to run that file two years later!

[@keithlucas6260]

Had to put notes in like that myself....plus adding several "M00's after it with more notes just in case someone's "autopilot" mode was kicking in.

[@zalamachineshop]

Keith Lucas You couldn't be more right. I'm not worried about an operator making a mistake on the 1st or 10th part but like you say when his "autopilot" mode kicks in and he's on part 666 on day 12 that's when the shit hits the fan. Sound like you've been there done that. Sometimes you just can't make programs idiot proof enough.

[@userwl2850]

Great work as usual 👏🏻👍

[@zalamachineshop]

Your Manual Trepanning videos inspired me to try it on the CNC.

[@wheelitzr2]

Which one of you came up with the treppaning design?

[@zalamachineshop]

wheelitzr2 I think the ancient Egyptians did.

[@wheelitzr2]

@@zalamachineshop that I actually believe.

[@kevinbowers3917]

Love the voice, "Zala mAchine". Cheers,ed.

[@Raptorman0909]

The sound of the boring bar is like a 1950's horror movie soundtrack!

[@zalamachineshop]

Once I got used to it I can nap with the noise here.

[@Tresoroeffnung]

Excellent!

[@knowltek]

Very nice..David Wilks..will Appreciate this... cheers 🍻

[@zalamachineshop]

I'm editing a new CNC trepanning video. New Trepan about twice this size.

[@jwc111684]

That is awesome

[@Malphazar]

Holy Harmonics batman! why are you cutting that all in one go? my ears!!

[@zalamachineshop]

I like to give the viewers the feeling of the cut. I could put music on the videos but then I get shit for my music choice. Nothing sweeter than the sound of cutting metal. Most of the time vibration is a big issue but in this case the tool was cutting and the inserts were lasting so I let it run.

[@MolesNoMoreEurekaMO]

When I run big Sandvik Corodrills into tough materials, I get the whole shop pissed at me. I tell them that is the sound of money!!

[@aminnami7577]

good job

[@sawantjaydeep72]

That's a great video sir . Thanks for sharing with us . Will you provide me the tool making details and the sample program for trepanning. Thanks and best of luck for the future projects. Also waiting for the new information from your side .Have a nice day ahead

[@thrustprop67]

I was guessing you didn't run coolant so viewers would see the machining operation better ,,, but wasn't sure . thanks for your response .

[@MagnetOnlyMotors]

Those look like dedicated jaws for this job.

[@zalamachineshop]

Made for this job but used on many others as well.

[@jeffgreenfield7025]

Can't quite tell which version OSP that is, but the newer ones actually have a anti-chatter function built in to the control, it varies the spindle speed at a set amount to reduce chatter and harmonics. There is even a optional microphone you can plug in to the USB so the control can measure the cut frequency and adjust.

[@zalamachineshop]

OSP-P300L I've tried getting the anti-chatter function going but can't figure it out.

[@jeffgreenfield7025]

@@zalamachineshop I can look on Tuesday, but there was a spindle oscillation parameter that goes with the mcode.

[@geohazelman7039]

Subbed.

[@dovereesserico7861]

That's experience.. 👍

[@generalfacts7652]

absolutely great machining... i never knew about trepanning before watch this video.. we use only U Drill.. but now came to know that there is another better replacement for the U drill... can i get this Trepanning tool in outside market?? how much is the Diameter of the Trepanning tool

[@zalamachineshop]

Thanks for watching. Trepanning is not always a better option in this case it helps because it cuts easier and I can push the machine a bit faster than with a Drill. I've tried many different drills and they all run slow because machine can't push hard enough for this material. Josef my milling master just made a "Homemade" drill that I will be trying this week. I'll keep posted.

[@akfarmboy49]

I really like your trepanning tool. What kinda insert do you use.

[@zalamachineshop]

Sandvik drilling inserts.

[@user-hv9gk5tc8z]

Nice work. I’m a former Okuma engineer and loved visiting shops like yours. Doing what it takes to get the job done, push the button and let ‘er eat! Bet you don’t use that touch setter much with those jaws....

[@tubok]

I mean just gotta take one the jaw off to touch all the tools off, then put the jaw back on

[@zalamachineshop]

Believe it or not I don't ever use my touch setters on any of our CNC lathes. I always set up the tools off the workpiece. Never trust the setter as much as actually measuring what the tool cuts.

[@waynec369]

Hardly any chatter in either operation. Very quiet. Nice.

[@zalamachineshop]

Got it even better after the video. Just about finished with the 1000 pc order. Got nice different jobs coming soon.

[@davesalzer3220]

I’d sure love to have a handful of those cores. I dig that rebar thread thing, what are they used for if you don’t mind sharing that info?

[@zalamachineshop]

Large construction. These particular ones are going to an airport rebuild. Multi year project.

[@user-kb4sy8gu1x]

Заламашин👍

[@mehmettemel8725]

4140 Black bar is not as expensive as 4140 peeled bar and trepanning is slower than u-drilling so is it worth saving a small diameter core material to sacrifice cycle time since the quantity looks high.Unless machine power is not adequate for u-drilling.

[@zalamachineshop]

Yea the machine is a beast on the 50 horse power spindle but can't push hard enough on the Z axis.

[@BamaRailfan]

Very nice. Have you run into any issues with concintricity on the minor diameter of the threads? Large tolerance?

[@BamaRailfan]

I'm a QC tech so these questions bug me. Lol.

[@zalamachineshop]

Pretty open tolerance so the slight step is not an issue. These get threaded on 20-24 foot bars so they ask that they are somewhat loose.

[@christurnblom4825]

I'm still pretty green and just learning about material costs. Is it preferable to do this whenever possible due to the re-usability of the slug?I ask because I'm working in my first legit. job shop and they throw away so much material. some of it I understand and some I don't it seems like it would be preferable to find uses or, at least a buyer for a lot of the stuff that they recycle and toss out. Right now it's great for me though because I have a small mill/lathe combo & trying to get my own side-hustle going so their scrap is helping me out a lot. The won't even let me pay for it.

[@FreeOfFantasy]

If you do slug removal it's a lot easier on your tooling and goes faster. Machine time is money and carbide is expensive.

[@zalamachineshop]

Speed is the key always on production jobs. In this case the trepanning is going faster than drilling because I can push it faster. The slugs are just a nice bonus.

[@meocats]

is the slug really worth that much? in your other video you just drilled it thru with a 4" kennametal drill

[@zalamachineshop]

Each job has many different variables. This material is a bit harder and harder to drill. Trepanning is easier on the machine especially if you got 1000 pieces or more to drill. Slug will only be worth if we find a good job for that material. Which we will sooner or later.

[@joshualegault1095]

I'd say it a huge waste of time

[@mannycalavera121]

I'm running a job in 254 smo atm, 220 diameter bar. About $12+ per mm. We're only using the outer 15mm, rest is being u drilled and bored. Can't buy it in tube. Can only imagine the money to be save using a trepanning tool. Also, his do you maintain sync while reducing the RPM? I've tried this on the NTX and it's lost sync.

[@zalamachineshop]

I think you'd save a lot.

[@davidb6576]

This seems like tube is available: www.materials.sandvik/en/materials-center/material-datasheets/tube-and-pipe-seamless/sandvik-254-smo/

[@evildrome]

Good video. Not sure about the mutant welded chuck jaws. Whatever gets you there I suppose!

[@zalamachineshop]

These jaws are 50% of the formula to get the thread done. Have to contact as much part surface as possible.

[@evildrome]

@@zalamachineshop I guess. That full depth cut must really challenge the rigidity of the setup. Hence the extended jaws . You didn't consider multiple passes with a narrower cutting insert? Is the insert you use custom ground? I've never seen one like it.

[@jonjuke6849]

@@zalamachineshop those are modified jaws ,you can't buy those anywhere .Some people never seen that before ,great job on your jaws and your machining skills

[@twstesteam347]

INSANE

[@zalamachineshop]

This guy get it.

[@imms74]

Really nice set up!!! Just curious, how did you sync your threading cycle when lowering the speed as it gets deeper in the cut.

[@85CEKR]

I'm thinking he has an option on his okuma, I forget what they call it, but it allows you change rpm and keep the threads synced.

[@freecali6506]

Constant surface speed g96

[@imms74]

aaron bernadr can’t use g96 in a canned threading cycle

[@Duplex500]

@@freecali6506 go back to school

[@mjoconr]

Why not use a udril ? Asking to understand the reasoning.

[@TheWireEDM]

Saving material for other use by not turning it to chips. Trepanning also helps in having less force required to cut through large diameters, thus enabling the work to be done on smaller machines.

[@zalamachineshop]

Jaakko Fagerlund knows what he is talking about. In this case the load on the machine was less because of cutting smaller area than with a drill. Drill has to remove all of the material in one shot this tool cuts only the strip of material.

[@AnonOmis1000]

What is a rope thread and what are its applications? I tried googling it but didnt find much.

[@flaplaya]

Looks like a very coarse thread that is similar to an acme thread

[@jjflounder1]

Test piece looked like a piece of rebar ..... I'm guessing that's a coupling for welding rebar together or welding something to rebar ....????

[@flaplaya]

Tensile Strength Jig most likely.. Just a guess :)

[@malthusdarmus1257]

It's for threading rope dumbass.

[@zalamachineshop]

@@malthusdarmus1257 Hahaha That made be spit my coffee out. Rope thread is used in large steel construction to anchor buildings, airports, dams, skyscrapers. Rebar in these large buildings threaded and our parts connect long lengths of this bar that goes all the way up on a skyscraper. We also make transition couplers with 2 different size threads in one.

[@manishkainth95]

Tool is not taking load of cutting and vibranting

[@braddavis4377]

How are the slugs recycled? Its looks like the slugs are a only a few step way from being finished parts themselves?

[@zalamachineshop]

We will use them on a future job one that is smaller than the slug.

[@campbellmorrison8540]

But how do you reference the center with the stock being clamped on an un-machined surface? When you reverse the stock you cant get the work recentered?

[@jeepmanxj]

Probably a huge tolerance for mismatch.

[@johnthomas5166]

Sometimes it isn't necessary to turn the OD before doing ID work. It all depends on what the print says. They are holding the material with a very long set of jaws so the "out if roundness" of the stock will be averaged over the whole part

[@BobJones-cr1pl]

Exactly what I thought. Should show i.d. Reference if there was any . Serious thread cutting. Must have been OK for the customer.....they made a bunch of 'em.

[@Gottenhimfella]

You can hear in the first few passes of the thread-cutting operation that the work is not running true at the far end. But evidently the tolerance is sufficient to accommodate the worst practical case. (It's taking glorified re-bar, after all....)

[@zalamachineshop]

Yea in this case the tolerance is big for the thread and as you can see in the end the thread gage is very loose and that's what the customer wants. First time we ran this job I cut all the way thru and cut the thread in one set up, but long tools cause more headaches we changed to this way and it works just as well.

[@sosaltysereezy]

*i wish my bar was that long*

[@jaytee6889]

So what was the reason for not using an inserted drill does the machine not have the power for a drill at size or is it cost efficient to make your own tool just curious

[@zalamachineshop]

We tried a few drills before this and all of them cause too much load on the Z axis. I have a "homemade" drill that I will try later this week. The slug is just an exra bonus.

[@tomituononen7192]

What size its that hole?

[@zalamachineshop]

2.9" 73mm

[@tomituononen7192]

@@zalamachineshop yes its big then

[@HaqqAttak]

No thru coolant on the thread? Or would that not really work?

[@zalamachineshop]

I always prefer thru coolant but in this case it was 100% necessary.

[@jeepmanxj]

You are brave as fuck using those jaws. Saw a young guy killed using welded jaws. Unpleasant day.

[@zalamachineshop]

Wow that is my worst nightmare. We do it all the time but the welder is quality and we make sure to put heavy welds.

[@cray2602]

Coring vs drilling - drilling is much less $ almost every time. Unless you are dealing with exotic metals or very large diameters.

[@jeremybailey6786]

Explain why please.

[@cray2602]

@@jeremybailey6786 Many reasons - The cost of the metal saved in a core does not usually offset the cost of the extra time it takes to tre-pan vs drilling and boring. Also when coring out a plug chip removal can become a huge problem and expensive broken tools are the end result. If it was more cost effective it would be the norm. In some unique situations it is more cost effective, but not usually. Metal machining has been around a long time, not much new under the sun anymore.

[@jeremybailey6786]

Got ya. Thanks.

[@jeepmanxj]

I can run a way bigger trepan than I can drill.

[@grahamcifuentes4451]

There is a worldwide industry making slugger cutters for magnetic drills who would emphatically disagree with you!

[@michaelrogers1036]

What are you doing with the cores?

[@Bibibosh]

Michael Rogers he feeds them to the homeless!

[@user-cm7qt7jh2q]

А че трубу не судьба купить ?

[@dragankalekatic9259]

Greatt

[@thrustprop67]

why don't you run the coolant on every operation,,, I isn't a machinist just curious.

[@zalamachineshop]

Just for video purposes where I can get away without it. On the regular the coolant is blasting every operation.

[@philipdixon]

so, you machined the outer rads with the wrong profile tool, you core drilled instead of U-Drilling it, you bored it halfway and turned it round and held on an unfinished rough diameter even though you had a boring tool long enough to go right thru. I'd wonder at the cycle time for this...

[@zalamachineshop]

I love these type of comments. I'll explain my reasoning for all aspects. Outer radius was done by the unused CNMG edge in a facing tool. I have thousands of these inserts with standard edge used but not this edge. Plus this edge holds up 3x longer. Trepanning instead of drilling because machine can't push drilling fast enough. I go faster with trepanning because of lower load........ I do have a homemade drill that is ready to go. I will take test cuts soon. Boring halfway is preferable whenever you can get away with it. Shorter tool longer tool life always. The tolerance for the ID is rather open and as long as the test rod threads thru very easily it is good. Cycle time is around 15 minutes at this time. We are half way thru a 1500 part order. Interested in your opinion on the threading.

[@squatchhammer7215]

Only way I can think of to improve threading is to use two tools for the job. Have one to remove a lot of the material and have a finisher to cut it to size.

[@zviper]

@@squatchhammer7215 Why waste time and money on extra inserts, when its a thread for rebar? Makes no sense if it works already.

[@aintskairtolskol9520]

a carbide 3inch bar would come in real handy there,what about a 250 in insert straight shoulder then come back with your setup for your radius on top of threads ,i can see push off even on the cnc,manual lathe would even be worse,just something to play with on a dead night just saying,cutting double lead threads are done by splitting it,might be done with that thread also,like i say something to kick around

[@zalamachineshop]

3" carbide would be extremely expensive and would break on the first bump. I really wanted to limit my tooling on this job so a single insert that does it all is preferable. With my calculation I wouldn't save much time and add more headaches.

[@xenonram]

@@zalamachineshop You seem to call crashes, "bumps." I guess it's a bump of sorts.

[@nikolaiownz]

GJ what okuma is that ?

[@zalamachineshop]

Okuma LBX4000 EX2 50 Horse Beast

[@willyharris4199]

Could someone dumb down what rope threading is for me?

[@zalamachineshop]

Rope threading is used in large construction projects like skyscrapers and dams and bridges. The couplers we make hold long rope threaded bars together in a pillon consiting of a dozen of these large bars. The thread is desinged to have flex and space for movement between the minor and major thread. Very strong but flexible thread.

[@willyharris4199]

@@zalamachineshop thanks a lot

[@tomituononen7192]

Take out the slug or u are fired hahh :D

[@FMS-Customs]

at the end 0 fired so far :D lol

[@adamscott7208]

Will you upload and milling videos soon?

[@zalamachineshop]

Sure I've got some coming.

[@adamscott7208]

@@zalamachineshop legend

[@WIPEYOURLENZ]

Man swarf

[@tenlittleindians]

Why no coolant during much of the machining?

[@zalamachineshop]

I try to film without coolant whenever I can get away with it so yall can see the cuts. Usually cut everything on the lathe with much coolant.

[@gun_ape]

been running okuma for a min and didn't even realize there is a G-code where you can operate with the door open -_-

[@justinhanson4337]

Emmanuel Ortega could have the maintenance door key in too

[@zalamachineshop]

There's many a ways to get the machine to get it done. Don't recommend it but if you try hard enough you can get it done.

[@Rod-zilla]

custom design trepanning tool look in the SANDVIK book , you mean a copy of a Sanvik tool

[@zalamachineshop]

We actually used Sandvik cartridges but still our own design. Check out our other larger versions. Guess there's only a few ways to make a trepanning tool. kzbin.info/www/bejne/fWHMq2irgLuYb68

[@martynford7113]

I bet the copy isn't even half the price to make, compared to buying the Sandvik tool

[@zalamachineshop]

@@martynford7113 Yea but no video

[@rufusleers]

I'm curious what this part is for lol.

[@zalamachineshop]

Large construction. These couplers keep large buildings anchored to the ground.

[@PegcoWigan]

would recommend a hertel drill for drilling, much faster! unless you re use the "slug"

[@johnthomas5166]

Hertel makes many drill types. Do you have a particular part number to suggest? Trepanning gets big holes made without having to make it all into chips. Sometimes if you're lucky the core can be used in other paying jobs. YAY FREE MATERIAL!!

[@PegcoWigan]

John Thomas Hertel DDS drill , centres itself and has insert holders built into the drill itself so it can be changed to cut different sizes we use one in work to cut a 96mm hole all the time ( mild steel , 316 , inconel, monel ) not as hard on the machine as a U/ Drill , I agree about the slug but is an option for them

[@zalamachineshop]

Been at this a while but never heard of Hertel. I will take a look at what they got. Thanks for the pointer.

[@beanshooter5784]

how did you disable the door interlock on the okuma? we have the interlocks on our haas machines disabled but apparently no one can figure out the okumas...

[@Green95LX]

Unbolt the male piece of the safety interlock switch and insert it into the switch.

[@zalamachineshop]

I don't know what you are talking about. I say if you don't know how to disable interlocks you probably shouldn't. Very dangerous and not at all recommended to anybody.

[@Green95LX]

@@zalamachineshop Valid point

[@beanshooter5784]

@@zalamachineshop i say you dont have many brain cells left if you think we dont know how to disable after i just told you we have the haas machines done

[@ChrisMaj]

@@beanshooter5784 did you read your first comment? You're the one that said no one can figure out the okumas, so I don't know about your brain cells.

[@aubreyaub]

Why is Hollow Bar not used?

[@marclaky384]

Alloy pipe or tube is really expensive. We made components out of 4.5" OD 4140 with a profiled bore. Tube vs billet was double the price. The time for drilling with custom made drills outweighed material costs.

[@xenonram]

@Adam Monster That doesn't make sense. A lot more work goes into producing pipe/tubing.

[@brandonbaeten6547]

@@xenonram agreed. it is cheaper to hollow out solid stock than get tubing in that grade (or most grades)

[@leichen5474]

阻力比较大 可以采用小槽刀 借刀的方式车出来 你这个我都有点心疼你的线轨机床了。

[@zalamachineshop]

你错了

[@leichen5474]

@@zalamachineshop 😂😂😂😂😂😂

[@ChatJokey]

I wonder, how much rigidity this lathe has.

[@Alexander_Santamaria]

Used to work for a threading company making 9 5/8" pipe casing for the oil fields in Canada. Place worked continental hours, Okuma's were threading 364/365 days a year, 24 hrs a day. Lot of respect for the durability of these things

[@zalamachineshop]

The Okuma is my favorite brand I've used. Everyday I turn the switch and they turn on and ready to work. No warm up just go. Also very forgiving when bumped.

[@Davemcmasters]

Do you reuse the slugs?

[@zalamachineshop]

Yes of course, that is a big reason to working this way. We get many valuable pieces of material left over instead of chips.

[@Davemcmasters]

@@zalamachineshop I never knew what trepanning was until I watched your video. The jobs you post look interesting and I would kill to work on the stuff you make but I'm all the way in buffalo new york lol

[@dustinwalden7091]

No material certs on the slugs so worthless. Should just use a big inserted drill and get it over with.

[@zalamachineshop]

You're joking No? All this material is certified going to build an airport.

[@RandomNumber141]

MarTool Does the certification carry over to the leftover slugs?

[@buğlemderya]

etkileyici :)

[@jackcann360]

I don’t get a treepaning tool instead of a drill 🤷🏻‍♂️

[@AnonOmis1000]

I'm no expert, but my guess is you save material.

[@Chris-du7hi]

op replied above not enough Z axis thrust for an indexable drill

[@biggawinnacrapsa3870]

Well, you have to learn to spell it first.

[@croyce7699]

In another comment he said it places less load on the machine, which means smaller machines may be able to do the job (because the cut surface is much smaller) and also, you're left with a usable 'offcut' at the end, rather than just useless chips.

[@jonjuke6849]

@@croyce7699 I think ur right ,if u don't have a strong machine with enough horse power ,it's gonna be difficult drilling strong solid metals

[@3rdaxis649]

Is this in India?

[@zalamachineshop]

No NJ USA

[@3rdaxis649]

@@zalamachineshop lol no way, I work at Singlepoint Precision in Boonton. Haha

[@meocats]

that don't sound too good. You can put inserts on the side to guide your drill that you grind yourself like a BTA drill

[@zalamachineshop]

Yea I was still working out the vibration issues. Got it dialed in better after the video. Job is done so I'm happy.

[@meocats]

you can dampen that threading bar by drilling it out and filling it with molten lead. would be a shame to chip that special insert

[@zalamachineshop]

I get north of 200 pieces per insert with this set up. Pretty happy with that.

[@meocats]

@@zalamachineshop well that's weird, in your other comment you said this material was hard to drill.

[@daryllemire6503]

I dont get why this is a fireable offense?

[@zalamachineshop]

That was a joke mostly. But if whoever was running the job at the time didn't take out the slug from the tool it would most likely friction weld to the next piece it was trying to drill. Not a pretty sight and lots of trouble to get back up and running.

[@Draig.cymraeg]

Anyone other headphone users flinch at 3:38?

[@jjflounder1]

That's the song of my people .... LoL 🤣👍

[@zalamachineshop]

Sweet sound of cutting hard metals. When it's quiet means machine is down.

[@ipadize]

*_ZALA MACHINE_*

[@Gaark]

nothing makes a headphone user jump more than unexpected ZALA MACHINE!

[@zalamachineshop]

@@Gaark I'm trying to make you remember it.

[@Gaark]

@@zalamachineshop Oh, im not complaining, I think it's pretty funny :D

[@skipjack996]

Unless that core is real valuable to you I don't think its faster than drilling and boring.

[@wjb111]

AGREED!

[@Juxtaposed1Nmotion]

Still turning AWAY from the turret, I dont get why. You are sacrificing rigidity

[@zalamachineshop]

Lol never noticed a difference and most of my tooling is RH.

[@TheLostBear78]

I worked in a machine shop with lots of old time machinists and all okuma lathes. Personally ran a lathe exactly like this, and one even bigger. He ran it EXACTLY how we always ran ours. I see nothing wrong here.

[@jonjuke6849]

Spin it the other way and see how that works out for u

[@biggawinnacrapsa3870]

8:15 thruogh 12:35 was me with my girlfriend last Friday night. She likes it nice and slow.

[@KevinK88]

When i see a comment like this i just think this must be some sad lonely 32 yearold lives in mom and pops basement that sees anything that could be remotely sexual and has to say something about it

[@biggawinnacrapsa3870]

@@KevinK88 - Yeah, OK, Mr. Kiss. Kiss my ass.

[@leichen5474]

机床刚性真好

[@zalamachineshop]

是的我朋友很棒的机器

[@leichen5474]

@@zalamachineshop 大佬你还会说中文 66666

[@zalamachineshop]

@@leichen5474 只有借助于 Google 我想得到中国的好评

[@madrox4132]

Not fired!

[@zalamachineshop]

Yet!!!!!

[@manishkainth95]

Use long boring tool

[@sergei1086]

Делетанты...!

[@thetruth6872]

Total waste of time

[@zalamachineshop]

Thanks for watching.

[@michaelbuckers]

Haha wow the finish on that thread is dogshit. Where I work we're mostly making 7" threaded pipes and the finish can't deviate much from "perfectly smooth mirror" at all. Then again, the thread is used for joining pipes and bad thread finish = failed coupling. Cutting speed is about 200 RPM with 1/5" thread pitch, the entire process (load, cut, eject) takes less than a minute.

[@zalamachineshop]

Guess every job is different. Customer was thrilled that we got as nice a finish as we got compared to other shops that they tried. Been in the game for many years but never did much oilfield work.

[@michaelbuckers]

@@zalamachineshop Yeah the QA requirements are stringent. If you can make out any imperfections with a naked eye then it won't pass, you don't even need to break out the micrometers. And that's on top of tolerance window measuring grand total of 6 thou. The tolerance is actually a much lesser factor to coupling success than thread finish, going end to end will change screwing torque by about 4k ft lbs, but bad finish can increase it by as much as 100k ft lbs which makes it impossible to complete: the metal gets torn open by the vices at less than 15k ft lbs of torque (at vice pressure levels low enough not to bend the pipe into tri-egg shape, which is an instant fail too).

[@jepkeklinge3778]

against what do you push your bar? what do u use as a material stop?

[@zalamachineshop]

We made a custom chuck plug with a step and a bore large enough for the threading tool to pass. Good question.

[@jepkeklinge3778]

Could you pls make a picture or make a video about it? Or maybe u have instagram?