Drilling Large Holes in Cast Iron with a Trepan Tool!

[@gregeconomeier1476]

Always enjoy listening to a well spoken, knowledgeable man.

[@PhaseConverterampV]

The cores of Trepanned steel that is quenched martensite, say 4140 HTSR 27-32 RC , is softer than the tube. We Trepan for efficiency to save time, then scrap the cores since they don’t have the strength properties that exist near OD. It’s a hardness gradient. Just saying, if you reuse your trepanned cores, make sure they meet the drawing spec for strength. We’ve had downhole tools break. OD 120ksi, core 90-100ksi. Cheers

[@nitrolx]

When Mr Debolt talks. . You listen. Great video!

[@piercer4882]

I could listen to that guy all day.. so knowledgeable and easy to understand and most importantly, willing to share the knowledge! Great content!

[@bcbloc02]

I liked Pauls tailstock dragging attachment.

[@userwl2850]

The inserts are WCMX 06T308. I noticed those scrap channels are straight. Trust me just 5° angle works better. I make and use these tools and cartridges to cut from 3" up to 18"

[@BrianHealy666]

Why not have the cutting tip at the bottom for swarf removal and also maximinum coolant coverage

[@nathanokun8801]

When the IOWA Class battleships were reactivated in 1981, the major job of reconstructing them was first born by the now-closed US Naval Shipyard in San Pedro, California. The first ship, USS NEW JERSEY, had to have lots of things done to it that were later going to also be applied to the other three ships, so a lot of design and experiment had to be done to develop the methods of reconstructing that type of ship to contain modern electronics and weapon systems (the 20mm PHALANX automatic AA systems, for example). One of the projects that had to be done to lay the large number of new electric power and control cables from topside to the various new equipment installed inside the hull was to cut eight 8" holes through the two-ply armored second deck (the one just below the weather deck amidships), which was 4.5" of Special Treatment Steel (STS, equivalent to US Army Rolled Homogeneous Armor for WWII tanks) bolted onto 1.5" of STS used as the deck structure of the ship (the load-bearing center of the ship hull was made from the waterline up almost entirely of armor steel). These eight holes had to be finished prior to major installation and testing of the affected equipment, so it was a tight schedule. The lead engineer on the project, Mr. Landgraf, contracted with a company who had diamond trepanning saws that they said could cut out the holes in one pass over about a day each hole. Then the bottom fell out when the shipyard section that did such things said that they could do it themselves with no contractors, USING BORING BARS AND REQUIRING A WEEK PER HOLE!. Mr. Landgraf was steaming mad about this, but he could not stop the contract being terminated and they barely finished the holes in time. He gave me a guided tour of the ship during two overhauls and in the first one, he showed me one of the holes being cut by a huge drill mounted vertically in a small compartment that was literally SCREAMING as it slowly cut through the hardened armor -- it took them more than six passes each with gradually enlarging holes to finally cut each one out. I cannot see how the person inside that room overseeing and lubricating the drilling process could stand it, even with thick protective ear coverings; it was like being in a pit from Hell in that tiny room. Trepanning is better...

[@howder1951]

23:00 "Keep everything as simple as possible" Amen! Man is that process impressive! Cheers!

[@Rx7man]

I really liked that, as well as the easy system to connect the tailstock to the carriage

[@howardosborne8647]

What a tremendous video this is. The deep trepanning method is explained in great detail and Paul is obviously a highly skilled and vastly experienced machinist......really enjoyed watching this👍

[@Badmike53]

You’re not cheap, you’re efficient.

[@morganmcintire2853]

we have used trepan tooling in our cnc machines, programmed a macro in the tool changer that removed the stub via a very strong magnet to the side of the chuck.

[@Rx7man]

good idea, as long as it's a magnetic material

[@alexhoselton2434]

As always, he shares like a professor with more knowledge than can be spoken.

[@outdoormountainman]

I have been watching your channel for quite a while now and I’m still a manual machine (lathe & mill) operator and seeing you explain a manual machine to your audience makes me feel ancient. BTW I still love your channel.

[@l30n7788]

KZbinr Userwl2850 is the master at this

[@spikeypineapple552]

Go watch this guy^

[@chrisstephens6673]

Amen to that, enormous holes in easy machine stuff like Inconel.😉

[@wjb111]

Yes. Watched a few of his videos. Impressive!

[@bcbloc02]

David (userwl2850 on you tube) is always poking some big holes in stuff with his trepanning tools even exotics like Inconel. Worth checking out if you like big iron!

[@dudleycornman1624]

@@bcbloc02 He makes his own tools as well...

[@rolandcraggs348]

I have used trepanning tools in CNC. Put a pause in the program so it could be hand loaded and unloaded. It does men you're tied to the machine for a full shift but the gains are more than worth it.

[@excitedbox5705]

You could use a lifting magnet on a tool to lift it out of the work piece and put it to the side or if it is a horizontal hole you could mount a magnet somewhere and use the tool to carry the piece over to the magnet and extract it.

[@Rx7man]

another option to remove the slug would be to plumb a good air source into the back of the tool, possibly Teed into the coolant line or add another one and give a shot of air to remove it.. you'd want to run it supervised for a while to dial it in for sure

[@Jacob-64]

I could listen to Paul speak all day about this ,so knowledgeable

[@robgoodsight6216]

I never knew one could "carrot" big cylinders out even bigger cylinders! Today I learnt something new! Thank you good sir!!!

[@Killernova86]

Abom outanowhere!

[@RadDadisRad]

22:10

[@feeseize9569]

That was cool AF

[@mannycalavera121]

We do some super alloy stainless that's 200mn and and about $6 per mm, 160id hole and and we do it the meters. I suggested trepanning out the cores but the were not interested. Big business mentality. Don't want me spending a day making a tool that would save them 100k a year.

[@Isenmouthe]

Sounds alot like the company where I'm a machinist's apprentice. "It costs money, no can do!"

[@evanlacava9213]

“No” is managements favorite word lol

[@kmcwhq]

Sad but typical.

[@JamesChurchill3]

Make one anyway, keep the cores.

[@shawncrocker7037]

We should totally just do away with management! There not my mom! There not the boss of me! We should totally like just run away from management! I find it rather amusing to hear adults talking about how stupid management is while they voluntarily sit at a table they don't own eating a lunch they didn't make. Going home to the home theater, paying there mortgage biweekly out of the multimillion dollar profits accuired through the financial orchestra of these "stupid" managers.

[@COdrummaCO]

I have that catalog, literally in my bathroom as a book to go through. I’m not even joking.

[@biltema2000]

22:10 now thats what i am talking about Paul, four jaw action babie.😂 abom79 FTW

[@imabeapirate]

God is that you?!? :D

[@ch34pskate16]

I’m not an artist like this gentleman but I can see a money saving opportunity with this type of boring. And anyshop manager worth his weight in scrap metal should also see this as an opportunity to secure contracts and a wider profit margin. Great video sir!

[@sparkiekosten5902]

"So many people can't grind anyway".....Classic!

[@Peter-V_00]

Paul is a great source of knowledge, his keep it simple style with real world reasons of why and how put him way above most people that do machine work, another superb video John, thank you for making it.

[@TheTsunamijuan]

I think the term is, Frugal. Not cheap :) Cause hes certainly getting a ton done. In a very reasonable and acceptable budget, that a small shop functions on.

[@IamVince1aa]

Love watching Paul

[@WryGrass100]

My first view, and I'm just an interested bystander. But the front end discussion is essential to what's going on. Very good.

[@routercnc9517]

Nice work and very easy to listen to. Such a wealth of knowledge and happy to share.

[@leonadeau2849]

I really enjoyed this video. Lot of knowledge here. Thanks.

[@rubarb0406]

Insightful. . . especially for those of us who have too little HP. Lots of great information here.

[@jbrownson]

What an uplifting conversation, thanks

[@pco1984]

I absolutely love the Allied drills, got two "main bodies" to work with, but they absolutely changed the way I'm drilling a hole. Never tried trepanning yet, hadn't had a series of holes big enough to warrant the cost of a tool, but it looks promising for when I do! Sidenote; I'm a terrible grinder, and I use the "tiny chip" inserts on them, they're amazing.

[@alexgon9627]

I work in oilfield down hole tools ,we drilled 3" x 30 or 40 foot drill collars on trepanning machines

[@Isenmouthe]

What an awesome product, never thought of that. I'm a machinist's apprentice. I definitely have to suggest this to the trade school I attend, because tramming in those mills is a pain as it is now, mic'ing directly on the plain. Either sugest they buy some rings or as a great project for a school apprentice to make some.

[@salvadorebertolone]

i know when i was starting, i was always tight on cash, go try to find a solid disc brake rotor. the one i used check under 2 tenths on a surface plate. i believe it was for a honda or something.

[@Watchyn_Yarwood]

David Wilks has a channel with some incredible trepaning videos. www.youtube.com/@userwl2850

[@NielPatel]

whats the name of the screw which has a drill hole on head to rotate it ? seen one on the Inside Cartridge of the tool.

[@rascalwind]

could you run air in addition to the coolant to evacuate the chips faster?

[@Kosmonooit]

Obviously got over your loathing of lathes :) thanks for the details of how this is done. I saw another video recently of doing the same into a billet of Inconel - super challenging.

[@kmcwhq]

I have used my Gisholt Turret Lathes and a Bullard VTL PROFITABLY for many years slugging out holes and roughing diameters. Even when it wasn't cool, and anything not CNC should go to the scrap yard. Funny how certain manual machines and processes still have a place in a CNC driven world. It's not so much the machine tools that are the limiting factor, it's the skill and creativity of the people using them that holds the key to working efficiently.

[@matthewchastain136]

I’ve seen guys use there steady rest to support the longer trepanning tools.

[@Livedracersteve]

Man I wish I could work for people like him, just a wealth of knowledge to learn. Sadly many shops around me just follow the sink or swim ideology.

[@chicoxiba]

PT/BR, furacao por trepanacao. Thank you to all machinists this is inspiring and brings back memories..

[@vendter]

Every time I see a video title "trepanning", I think someone is going to drill a hole in their head.

[@jamesdriscoll9405]

My first thought too.

[@andreasbeier2431]

Sam O‘nella

[@pieterbotes8938]

You surely have a decent lathe to do trepanning. I used to do a lot of trepanning up to 95 mm diameter. A good video for the viewers who don't know what it is.

[@josepheirman4987]

we use those at work all the time in our cnc's we put optional stops in the program to remove the slugs. and our customers get a reduction in price for the core.

[@piavigdalsgaard2230]

David Wilks

[@kamil19951]

Good idea with this tramming ring. Its pain in the ass to tramm the head over parallels.

[@matthewchastain136]

That is such a genius and simple way to power feed the tail stock

[@velez910]

The saved material is a great. We use spade drills up to 4 inch at our shop but I have seen much larger spade drills

[@starlyabadillo6529]

Thanks Paul and thanks for the tour always enjoy.

[@Joe___R]

Those trepan drills work great, just like using an angular cutter on a mag drill. That is definitely the best way to bore a large hole on a lathe or a large drill press since it goes quick and leaves you usable material instead of just chips.

[@xenonram]

Annular cutter.

[@Watchyn_Yarwood]

David Wilks has a channel with some incredible trepaning videos. www.youtube.com/@userwl2850

[@Guds777]

Excellent content. One thing i want to know, do he have automatic stop when it has finish boring or does he have to stop it manually...

[@brockfrancis4398]

Guds777 I was wondering the same.

[@shivamnaidu3716]

What kind of machine it is can you please tell me?

[@tobiasripper4124]

paul and john thank you for this video! in love with this system.

[@WeTrudgeOn]

I have a newer model of that lathe, used of course. How is he running the saddle without the lathe running?

[@Puckthepolice]

Looks like it's equipped with a rapid traverse mechanism.

[@p.debolt6784]

@@Puckthepolice The Carriage has a independent rapid motor, from the spindle. The Rapid motor then locks out when power feed is engaged, locking it into the spindle drive.

[@ralhmcc47]

Like listening to Paul, also nice to see he is wearing his dress flannel shirt Ralph

[@2dividedby3equals666]

The HBX made by Cazeneuve had a rod that would engage the apron and give the tailstock autofeed. It's a smaller lathe than what Mr. Debolt has though. Thanks for sharing John, take care!!

[@25centsapop]

That's a huge slugger bit! Amazing work

[@robrussell5911]

It's interesting to hear the American pronunciation or many terms and even the names in this video. Not right or wrong, just different by our regions. I am Canadian and I guess we held onto more European pronunciations, both English and French. I enjoy listening to how people speak.

[@alexcrouse]

So, it's an insert annular cutter? Awesome.

[@donmathias1705]

The biggest saving is time, You do not have to turn a large portion of the core into chips. It is also a balanced up if you have tips at 180 deg

[@scor440]

😳 Safety glasses unheard of on youtube!Nice

[@RadDadisRad]

Sanndvik makes knife steel as well. Pretty impressive if you think about it.

[@michaelmiller5566]

He has an awesome collection of items for sale on his website. Just ordered a few things. Thanks

[@SketchZify]

Wheres that nascar shop tour video gone?

[@broheim23]

Great video, John! 👍 (Nice guest voiceover by Adam, too.)

[@wayned1807]

I've seen rings with post attached so you can straddle your vise. I guess if the ring is big enough you could stack 1-2-3 blocks on each side of the vise.

[@joed2392]

Well IBD !! Now that's AWESOME !! You would think that some of the larger lathes would have this feature ! If this is Paul Debolt's design, he should get a patent for it !! Just think of the price of the cores, that wound-up in your chip pan after a regular boring job !!! Great video, too !

[@TheDefeatest]

More Paul!

[@KX36]

1:00 who knew it but I had the little white trepan in the background at home all along.

[@JeffryLandry]

Good timing, I was just thinking about you yesterday wondering if you were still running the training shop. I been with ya since your basement days in NYC and have missed seeing your videos.

[@devastator39]

At one place I worked, we just put the tailstock in front of the carriage to use the power feed, instead of drilling holes in it. . Easy peasy.

[@thomasrappen5906]

Hi friends, dear Apul,You're talking about a 'powermeter' I modified my 12x40 with a simple ampmeter, So I can rate the actual current to the maximum power, maybe it's helpful for You too.. You caqn get some transformers/ transducers, which change the 'hot current' to a smaller signal, e.g. 0-10V, 0-1A, I made on two machines an anlouge gauge, so You see the arrow dancing in a good and precice way, do a 'red mark', and so You know know my a displayed value, ow had You run your cuty... THX, Like the drill, like your(s) way of thinking..

[@josephwaldner7752]

might i mention martool does this on a cnc lathe/

[@thomasrappen5906]

thx paul, thx john, very impressive...Paul, John, small issue, You're talking about a 'Powermeter. I made a smal Amp- meter on my 7x12 Lathe, nominal 230V, 300W, so ~2A... works so well, to go to the 'limit' is too easy ;) place one in IP68, proof agains all the liquids, visible to the machine, and You can hear and see the lod... BR, Keep healty and busy grey wolves...

[@billiondollardan]

That's interesting. I have a trepan drill I use to drill out dental implants. It's difficult to line up in the mouth, but when done properly you get a slightly damaged implant and a tiny bit of bone out after the procedure

[@incubatork]

Does Pail have a youtube channel? he is very entertaining and from other videos does some amazing stuff.

[@antongyrt4814]

Почему две точки съёма стружки? Мне кажеться две точки не очень правильно, возможны отклонения и вибрации в перпендикулярном пластинам направлении. Если сделать три точки то инструмент будет стабилизироваться по оси.

[@TomChame]

Very neat, thanks.

[@knowltek]

David Wilkes chk out his page. Lots of this type of drilling...

[@chrisyboy666]

Can’t compare this to bloke to David’s Wilkes not even on the same planet never mind league..

[@knowltek]

Carlos make him like he’s running in slow motion..haha

[@spacehitchhiker4264]

You could probably put one of those on a cnc if there was a cylinder to push the core half way out so the chuck could grab it

[@hardtipmetalworks8348]

great work

[@ktmtooling]

I see lathe machine, Do they have CNC machine there?

[@p.debolt6784]

Yes

[@funone8716]

Why was the NASCAR video taken down?

[@京都港區]

Super drill nice

[@georgepierce8535]

Could be described as a precision hole saw?

[@martindworak]

You can provide the metric size of the bore size, some of us actually prefer it.

[@dougankrum3328]

There's big old shop on here where they made their own trepanning tool, cut about 10" diameter through a 5-6 foot long piece of material maybe 16" diameter...whatever it was they made 4-5 of them...

[@Watchyn_Yarwood]

David Wilks has a channel with some incredible trepaning videos. www.youtube.com/@userwl2850

[@CleaveMountaineering]

So is a carpenter's hole saw technically trepanning?

[@CleaveMountaineering]

Oh, and I love the auto feed on the tailstock by linking to the carriage. That's brilliant, I could even rig that on my circa 1900 lathe.

[@alexanderc5312]

this guy is the man

[@notamouse5630]

Method to CNC Trepan: move drill to big electromagnet and pull, turn electromagnet off and drop slug in pile, next.

[@Rx7man]

that's material sensitive though, won't work great on some stainless and non ferrous though

[@viscache1]

There’s a second phase to ‘listening to your machine’. After years in the military and various other abuses of ones youthful ears I’ve learned to ‘feel’ the vibration transferred to the lath bench and make adjustments from there.

[@nielsklavers7312]

why is the haas nascar video gone ?

[@ΓιαννηςΓριζοπουλος-γ9τ]

Trepaning nice road to destroy the lathe.......spesialy the transfer bed. John Grizopoylos retired machinist From Greece

[@ROBRENZ]

Good stuff John! ATB, Robin

[@velez910]

Spade drills for the win I love those things. Dealing going to look into the core drill my shop dont use them and we do really really big stuff

[@Watchyn_Yarwood]

David Wilks has a channel with some incredible trepaning videos. www.youtube.com/@userwl2850

[@evanlacava9213]

Love this guy! 💪🏻👍🏻

[@postRMO]

what a great guy

[@shawncrocker7037]

Interesting to note. There is more volume of material in the cutting zone then in the saved slug. 142% more material

[@viscache1]

“Cheap” is totally relative. If you save money without sacrificing results you are actually “Frugal”. I understand “Cheap” because last Christmas I put a 1/2”x1/2” set of Stellite cutters on my wish list and in my stocking were 1/4”x1/4” mini-lathe hardened steel blanks... It was from a relative who is “Relatively Cheap”... I don’t mind grinding and shaping my own tools but I prefer to have the right blank to do the job. Now “Grace” is smiling, hugging, ‘ooh-ing’ and ‘ahh-ing’ sufficiently and keeping them handy in the tool tray in case they ask how they worked.. Regardless, there is NEVER an excuse for being rude.

[@brayanamadeus9351]

Increíble nunca había visto algo a si

[@billdlv]

Very cool. Check out @userwl2850 channel, he does this on many super alloys and extremely large bores.

[@hemligagosta6554]

and he makes his own tools

[@ChrisMaj]

Man, he's the master of trepanning.

[@lancer2204]

kzbin.info

[@chrisstephens6673]

You ain't seen big holes till you see him work.

[@hemligagosta6554]

@@chrisstephens6673 yeah, that piece paul is trepanning is the normal diameter and a fifth in length of the plugs he pulls out of the material he's trepanning.