WHAT Are Tangential Lathe Tools?

Can't see the point.

It's like a circular thread cutter but not circular! I like it!

See if you can find a supplier of Solid Carbide blanks, then make a holder for those.
I might give it a try, since i make most of my lathe tools from Solid Carbide, broken or blunt Endmills,
In the past i have used square pieces of Solid Carbide which did the job excellently, though i had to grind them on 3 faces..
I use a Diamond wheel to sharpen them, and.. i admit.. boring bars are made on a wire EDM machine..

I use a diamond tangential tool mostly when using HSS on both my main lathe and my Russian mini lathe.

Got one of these 15 years ago. I would have saved a fortune if I knew about it before buying carbide tools which chip on my cheap 7x14.

Not much to recommend it. That tail is always in the way and the grinding is only a minor benefit.

⭐️⭐️⭐️⭐️⭐️

Going try it with just plastic

Very great video /info on tangencial tools. This tool geometry made it's way into the standard HSS tool world of lathe tool bits [diamond grind shape] ironical from the use of this grind on HSS tools used in the balance and roller box tooling from screw machines back in the 1930's thru 70's IMHO.

I'm new here. But I have a comment question.
While cutting some flat stock in my vice in my basement, with my hacksaw I ended up pushing too hard (1/8th x 2" ) I split my index finger nail in half at the base of thr nail threw my finger on the last stroke. It was amazingly bad. That was November ish 2019. For that christmass my wife allowed me to buy a used milwaukee porta band saw. I had one previously but sold it to a friend the year before because he was in need and at the time I was not using it nearly enough to justify it.

I made it wall mount by a 2x4 steel tube that I cut the face and sides to accept the tools forward handle and welded it to a plate at the right angle to hang the saw.

I made a 4 inch wide by 7 inch long cutting table that bolts around the foot of the saw and while semi stable, it is actually really good.

I will make a video of this conversion from a handheld portaband saw to wall mount if you ask for one.

But here is thr question. Have you considered swapping the hacksaw out for a different tool like a portaband? Or handheld bandsaw?

I have just picked up a old Hercus lathe 1957 era due to being on a disability pension i dont have alot of money. Can i buy one of these holders . I cannot afford the carbide tool and bits so i was going to learn to sharpen Hss. But with this it looks like it would be even easier. Type c lathe . I can use up to 20 mm holder. Let me know if you would consider selling one also i live in perth Australia 6174 . Cheers Andy Andy

Somebody get this man a portable bandsaw

Check out 'Eccentric Engineering'.
Both square & round tangential tools work amazingly well with brass, cast iron, aluminium, plastics & composites.
Would have loved to see the finishing comparison on a longer piece of material with tailstock support.
If you twist-mount the HSS blank, it works as a shear tool too. The surface finish is dramatically improved over 99% of inserts that a DIY enthusiast can afford.
The lathe headstock does need to be as rigid as possible though, Worn out bearings will leave a chattery finish with any cutting tool, hss or carbide or CBN.

Thanks for sharing

Thank you, very interesting

This principle has been used in form tools. It is easily sharpened as you pointed out, and the form isn't lost in the process. Another style is a partial circle with an adjustable means to keep it from rotating under load. I've considered making threading tools with the profile following the length of the blank. Probably would use a set/grub screw to adjustably counteract the axial load.
Wanna' do and do are two separate things.

fantastic

I fail to see the logic. What’s the point of creating another joint when you can grind tools in hss or carbide on a diamond wheel that are far more rigid. What you’re calling a good surface finish look very rough to me.

Hi Artisan Makes, you have an accent that i cant pick, where are you from mate.

One problem I see is that the tool will want to slip downward and nothing is there to stop it. I like the idea of just holding it at a compound angle and grinding one face, but the extra bulk at the front does add some additional limitations.

Vice in a vice

Interesting

Wouldn't it make more sense to use a tool laying down horizontally with a back slope and just grind the same diamond but on the bottom? Lmfao. You have overcomplicated this to the max. Like imagine if you could just tip a standard toolholder back 15-35 degrees, drop it down to center it, and single diamond to create relief angles.

Been using my diamond tool holder for over 20 years now. Still have the same 6 pieces of tool bit i bought originally

I wonder if you could soft solder the tool bit in place, since the heat wouldn't be enough to ruin the temper

You should really hone about a .008" radius on the corner of the cut edge. Leaving it sharp is a no-no. It will prevent chipping and give you a more consistent surface finish.

Cool project! ... your corner radius might be a bit too small though.

I noticed the part of stock was wobbling or uneven, is that the stock or the placement in the chuck, just wonder if it's the machine or the stock, not knowing how good these Mimi lathes are compared to high grade full size lathes , thanks for the vids

Nicely Done! Have you considering heat treating your tool holder?

I appreciate people teaching other, this is not the way to do it. If you have never used this type of cutter, don't go and try to explain what you don't know. At least be a little proficient in it. Just my opinion.

That is not what I was taught as Tangential Cutting. You have created a conventional tool face simply on the end of the blank, which is Tangential Tooling, as stated. The faces and reliefs are presented no differently to the work than a conventionally held tool. Hence the cutting is essentially the same and tool maintenance is simplified,

Tangential Cutting is where the cutting edge is a line where two faces meet which is tangent ( in the X-Y plane) to the center of the work. This would normally be the edge where the side and end relief faces meet. This edge is held at a slight angle to the work in the Y-Z plane, tipping toward the tail stock. The normal cutting edge (with which you are cutting) is well above the center of the work and never comes in contact.

The actual cutting is effected as the work rotates it moves down into the slightly angled (back) edge of the tool in a shearing motion. If you’ve ever seen a cut-style knurler, or a rotary broach, the principle of using angular change in motion to apply tool pressure is the same.

However, your take on this topic is in compliance with the conventional presentation for tooling. It is important that the distinction between Tangential tooling and cutting are made. I guess you need really old textbooks, or old mentors (as in my case) to get the original ideas before they get lost in translation over time. I believe you'll find Tangential Cutting far more interesting and useful.

Nicely done, keep up the good work.

you dont cut stock by hand in 21 century!

Good effort...but eccentric have done all that and more.
They’re dear but at least we’re supporting our countrymen.
Happy 2022 Virus free

Watching the grinders tool rest flex might make for a good future project upgrade!

your voice only come in left side it's annoying

But...why? Insert tools are so cheap, why even bother with HSS?

Life time as a machinist, I learned something new, thank you, 🇬🇧👍.

To improve this you could make the dovetail of the qcth built in to the cutter

Видео очень хорошее.
Автор на личном примере убедился, что такое "передний угол" "задний угол" и другие вспомогательные углы заточки резца. Весьма полезно.
Изобретён велосипед;))
Ничего страшного

Thank you for your information regarding the lack of space with the mini-lathe. So you have done well to fit what looks like a 1/4", 6mm sq cutter. Regards, Mervyn Price. My lathe is an ML7

Just use insert tooling

YES, i love that video

There are a lot of these cutters about. Your video was interesting. It showed the principals involve., Looking at how these things are normally made, would have produced a better design. Clamping a square HSS tool is simply an evolution of clamping a round HSS tool.

I really enjoy your take on things. Makes me feel like I’m learning with you. Thanks for bringing us along. 👌🏼

I find the need to have tool holders that must be held in other tool holders a pain as you can only have one type of tool, whereas you also need to do threading, parting, boring and grooving etc.........the normal QCTP holders provide enough tool holding functions for normal square tool bits without special tool holders that need special tool bit grinding......true you can use up short bits of HSS but I use them for boring bar inserts anyway.

Well done on your experiments, so few bother these days and just settle for insert tooling.
You will find that 12 degrees forward and sideways work well with a 30 degree grind across the top. You will also fine a small radius, a few thou or so, on the cutting corner running the entire length gives a more durable tool.
It beats me why these tools seem to have gone out of favour in Edwardian times, except for in things like roller box tools, but these days for home shops they are a brilliant money saver and go to show that all those angles listed in the usual literature for different materials is a touch of baloney.

A handy design for using small bits of HSS and easy to set on centre height. However unless you grind a small nose radius onto the cutting tip it will wear out almost immediately. If you did that, it wouldn't technically be ground just on the top face.

Great video! I bought the Eccentric Engineering diamond tool holder & the inverted parting tool for my Optimun TU2004V lathe. Due to the excessive overhang, I found that the tool would catch easily, so I ditched the QT tool post & went back to the standard tool post & the results are now exceptional.

Just watch Eccentric Engineering videos…👍 Diamond Tool Holder