HSS pot scrubbers - for when you absolutely, positively have to ruin your old ladies non stick pans. It probably would polish up hardened drill rod/O2/A2 very well.

Turning cobalt HSS as if it was aluminium. That's quite spectacular.

Nice compilation from the live version! 👍 The slo-mo really reinforces the way the chips take out the heat. Looking forward to the broaching process, too.

That’s amazing watching those chips glow! Thanks for this sweet video

You should add a time delay on the spindle.0.at-speed pin in the LinuxCNC to prevent cutting before the spindle is fully up to speed.

Hi Mark that sure does glow pretty. I did forget to mention on our live stream thread about the taper, is that you can program it out. Once you know what the taper is you "simply" program that as your tool path. It's done all of the time in production, especially for parts turned between centers , there is no way around part deflection otherwise.

I'm a hobby machinist and have spent 30 years trying to learn as much as possible. This video was the best, most engaging learning I've experienced since hanging out with my 90 year old tool maker friend when I first fell in love with machining. THANKYOU for your time and content. This was so good. I fully thought you were kiwi like me with your accent, but maybe an Xpat... thanks from down under down under. Chch nZ ❤

That was really cool, it's truly amazing the advancements in tooling these days. 👍

Wow, great videography! Really liked the close up Makro shots. As for the chipped insert, you at least can touch them up one time, just put on a nice slightly negative radius on the cutting edge.

Impressive to see the redglowing string of chips! Looks like the insert would love to see even more speed

Spectacular shots of the chips, and real interesting video!

Wholly chit! those red hot chips are insane, but look at that finish!

First seen on the Internet .. Phase Change Inserts .. really nice shots.. thanks !!

it's really cool to see someone actually hard turn on youtube. hopefully we can see more hard turning with say something like 4140 ph

Making glowing worms like that, you should be wearing a wizards hat.

Oh man, that fiery lava swarf is just music to your eyes...

Those macro shots! That surface quality! Yowza.

Hi Mark. Another great video. Back in the day, early nineties we used to turn hardened toolsteels D2 and O1 mainly at approx rc 60 using ceramic tips these also put out nice red hot swarf. I haven't done any real hard turning since. With the cnc lathe I think you should try putting bigger radius on diameter change steps as much as possible to avoid stress concentrators. Especially with rotary broach tooling. Cheers for the excellent vid

I hope you are going to sharpen that CBN tool back to cutting shape. Robin Renzetti told us on his Instagram that you have to lap the edge of the CBN insert to a very keen edge if you want to avoid chipping of the edge. You of course use diamond wheel for sharpening.

Mark, slo-mo is just incredible!!!

That's so cool when the metal gets separated and starts glowing. Don't touch 😁

CBN works very well, even on light machines ! A rigid one gives a better surface finish, but the cutting forces are not that high.

Great slo mo shots 😀

I've always wondered how a cbn tool cut so well while the cutting edges are chamfered

Those diamond tools are very nearly magical.

Nice work

I did some hard turning of some 62 rockwell C tool steel the other day, what I found was the inserts would almost immediately chip but then would cut just fine on the chipped surface for a decent amount of time. I wasn't using any kind of special insert, just regular stuff for turning steel. I'm guessing hard turning likes a blunt edge, so that CBN insert might last some time even with the chipped edge.

Gday from Australia 🎉 Love the schaublin

Heh, I'd be interested in that Schaublin 125-CNC if it wasn't in France, and I was in the US (the shipping might be a tad expensive), and if I hadn't just gotten a late 90's CNC lathe for free last weekend!

Recall turning the shanks of Taps to provide a measure of relief while working at Sunkist Growers 1987-8. I used slow speed, fresh-tipped carbide insert tooling, and very slow feed.

Linux tip! Instead of using an HDMI splitter, you could capture directly in software from your LinuxCNC machine since -- it's a Linux machine! Normal things work on that too. You'd only have to make sure you have enough performance dedicated to running the actual machining program first. Fortunately, a feature on Linux called cgroups is very good at guaranteeing some minimum specs (ram, cpu, etc...) for the app, and you could test it to see if doing both simultaneously causes either frame loss or spindle issues.

i love turning hardened stuff... until facing the part :D

about time :)

I saw a Schaublin 102N for $3750, but it's too small for me: i bet super precise though, like a Wabeco. A china E-leadscrew lathe on ebay is $2k, but it's got 1.5" thru hole and 40 inch bed: no way i'd trust the electrics as you're totally reliant on it not failing, imagine trying to find a replacement.

Oh this is going to be a good one. I just went through this with my Wolhlaupter head with a integrated 1-1/2” straight shank. I too used the CBN inserts on my lil Clausing Metosa C1330S manual lathe. I was able to turn that 1-1/2” shank down to a .010” oversized 3/4” shank, then finished it up with the trusty tool post grinder down to size. Them Wolhlaupter heads are case hardened to Rockwell 20,000 billion I think…. But I managed to turn it down with only one tip of one insert by taking .005” passes or less. The plan was to “practice hard turn” the shank down and then ultimately cut the shank off and drill and tap it for the differential screw ( I believe it is 20mm 1.5 and 16mm 2.5 pitch but I haven’t been able to confirm that yet) they also had two 10mm drive pins at 40mm on center. Boy am I’m glad to see you taking this one on. I’m hoping to learn a little bit more and interested to see how the Schaublin does as well. Always enjoy your videos, and I really appreciate your humble approach. You are going to love that boring and facing head though ! Looking forward to seeing its cameos in upcoming videos ! 😊

For the hdmi splitter idea i recomend adding a wireless hdmi cable (about $35 usd on amazon), you may want to cut the ddc pin on the wireless transmitter as you dont want it fighting with the lcd panel to set the resolution (at least it was on the cheap splitters ive used, aparently more expensive ones have ddc priority so it would take the resolution from one port and just duplicate to the second port, that was just the cheapest powered splitter i was using that needed ddc cut)

If you set up the system to drive the spindle.0.at-speed pin then G1 moves won't start until the spindle is up to speed.

when hardturning with a cbn tool never ever use liquid coolin on them at all. max use some air and its not just with hard turning that you make plasma deformation but you actually do that with every metal machinigh operation ( even grinding. we where tought that by seco back in school when i took the education as a machinest ) also there is a roughing technice that i developed. tested and used myself witch extended the inser corner life from 4 parts pr corner to more then 25 parts pr. coner with the same feed's and speed's witch i call "constant varying depth" it casly have to be hand programmed ( at least for now ) but it is super effective to increase the tool/corner life of the roughing insert eks. N300 G28 V0U0 G28 W0 G40G18G80 T0202M91 G54 G96M3S100P11 G50S1500 M28 G0 Z0.2 G0 X50. G1 X-1.6 F0.18 G1 0.3 X1.0 G0Z0.5 G0 X45. G1 X47.0Z-12. F0.25 G1 X45.0 Z-22. G1 X47.0 Z-29.7 G1 X50.0 Z-29.6 G0 Z0.5 G0 X42. G1 X44. Z-5. G1 X42. Z-11. G1 X44. Z-19. G1 X42. Z-25. G1 X44. Z-27. G1 X42. Z-29.7 G1 X45. Z-29.6 G0 Z0.5 G0 X40. G1 Z-30.0 G1 X50. G0 Z0 X100 G28 V0U0 G28 W0 ( the G28 just tells it to go in hope position and the "V" "U" and "W" is actual machine axis ( the W is for a Y axis btw ) you can just ignore the G28 ones ( took this from a program i made some time ago ) and also forget the P11 since it was specific for the citizen dual spindle tripple turret. witch allowed it to actually start turning the spindle and the M91 was to allow it to change over to the tool try put the code into " ncviewer.com " set to lathe mode to see how it actually look and how it works instead of letting it cut air why not just put in G4 x5 in before the first cut ? that way it would get up to full rpm before moveing ? ( G4 is a dwell command and the X value in the same line is how many seconds its dwelling for )

I've turned HSS on my Smart & Brown lathe. Not something I need to do often but carbide inserts did it with no real issue. I can't remember what I needed to do it for as it was some time back.

Welp I did buy sort of buy accident RockTec 65 tooling, was quite surprised on how much it didn't care to cut HSS steel.. I wonder though on how crazy the cuts can go actually. Does the schaublin not have any cooling? I think that would go better in terms of thermal schock.

Next video: Can you machine Plutonium spheres in home shop 🤔

Great video Mark. I have recently acquired a Wohlhopter UPA 4 with an ANSI 4 / MT 4 taper arbor that I want to change. However mine does not appear to have a removable arbor like yours. Do you have any information about the UPA 4 that could help me?

what tips are those again sir? that is amazing and I do a lot of hard Stainless. it is very hard for me to cut on my mini[-lathe but those tips would work amazing!

Page 11:40 do keep those HSS wool by your kitchen sink for your next tough scrubbing.

At some point with the rotary broach, how does one go about accounting for the hole depth you're going to lose to the swarf(?) that's being compacted into the bottom of the hole? If I need x millimeters of hex key tool engagement (depth) in this bolt I'm making, and the tool is a y millimeter hex, what is the initial "x + z" hole depth I'm going to have to drill/bore?

Can you not put a G04 in there before the machine picks up the G01? (To allow the spindle to get to speed. Maybe a 5 second dwell?)

11:36 HS Steel Pot Scrubbers? Test it, market it, make Vienna the hub of innovation! But with the 1micron accurate Schäublin just chuck up the pot and remove the stuck food without damaging the pot? 😎

Does Linux CNC have a MDI mode where you can execute single lines of code. If so something like S3000 M02 could pre start the spindle and the real program would not be accelerating the spindle at program start. You could get real fancy adding the spindle speed and start to the main program along with an optional stop. BTW The Chinese make a direct copy of the Narex so that may be an option for a cheaper arbour. (toolmaster from Hare & Forbes here in Aus and Unzud

How concerned are you about hardened swarf on the lathe ways and such?

It looked as though a laser was cutting it.😁

I turn die punches (60 HRC) with CBN, it's a lot faster than cylindrical grinding.

The Narex is a great tool to have

Wouldn't it be easier to buy sk40 holder with thread 1 1/2" for boring heads and turn new diameter and thread as is in Narex? To match with drive slots you can use shims or turn exact lenght.

You didn't seem to be breaking any chips. Is that because the CBN inserts don't have any chip breaking geometry, or because you were taking too light of a cut? Maybe flat top geometry is the proper chip breaking shape for HSS turning, or hard turning in general. Just curious about what sort of chip should be created with CBN. Thanks for the content!

Say I just picked up an Alexander precision grinder 2CGD and restored it. Is it worth anything and where should I try to sell it? Nice finish from such a fractured diamond...

All of the heat never goes out with the chips. Most of it could

Man, when I saw the thumbnail I thought you'd been having fun with a photo editor. But... nope. Very dramatic watching that inferno come off the part.

Is "hard as buggery" a NZ standard?

Just use G4 P5 after M3, much more elegant.

👍😎👍

About the Slowmo Flickering... You edit your Videos with Davinci right? Give it one or two passes of the 'De-Flickering' Filter and it should be good to go

You kept saying HARD and RIGID that I wanted to make a joke, but I thought that would be a bit limp

The link for stefano is truncated. Can you repost?

Quite the opposite of cool, but cool footage non the less!

Humanity must attack bottlenecks - such as inventing how to cheaply produce cubic boron nitride inserts.

If only there were machines for finishing hard materials to fine tolerances. They should build lathes with, like, an angle grinder attached to it, and call them round grinders, or something

I don't think breathing all the cobalt is super healthy, use a vacuum with filter or wear a respirator.