The ultimate turning tool

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W.Pastuch
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The ultimate turning tool

Post by W.Pastuch »

Hey everyone,

I just made a tool aquisition so exciting that my hands are shaking :lol: and I couldn't possibly not share it with you.
I used to have occasional problems with the sharpness of my hss turning tools. Often at the moment when I really needed to take that final pass on the tenon and stem face my tool would become just a bit too dull leaving crappy finish. I got tired of these situation and the constant need to sharpen and hone my tools and I wanted to find a definitive solution.
Here it is:
Image
It's an indexable turning insert called DCGT and it is made for finish turning of aluminum and non-ferrous metal. Unlike all other carbide inserts the edges are actually sharp and their surface is polished. They come in different shapes depending on the operation you want to do, for this particular one (the acute angle is very comfortable for tenon/face turning and it fits nicely between your work and a live center) you need a tool holder called SDJCR.
It leaves a perfect finish, touch it up on the buffer and it's as good as you can possibly want it.
No more grinding, honing, messing around with your hss tool. Just one tool that works everytime and when it gets dull (I guess it will take quite a while since it's carbide) or breaks you just buy a new insert that costs around $5.
I hope someone will find it as usefull as I do. I'm so happy, I need to turn some tenons now! :D
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Tyler
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Re: The ultimate turning tool

Post by Tyler »

Great tip! Thanks for sharing.
wdteipen
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Re: The ultimate turning tool

Post by wdteipen »

Where can one purchase this magically imbued artifact?
Wayne Teipen
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W.Pastuch
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Re: The ultimate turning tool

Post by W.Pastuch »

I recommend asking The Great Wise Wizard Google.
pipedreamer
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Re: The ultimate turning tool

Post by pipedreamer »

Msc industrial supply
wdteipen
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Re: The ultimate turning tool

Post by wdteipen »

W.Pastuch wrote:I recommend asking The Great Wise Wizard Google.
Too much work. Nevermind.
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PremalChheda
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Re: The ultimate turning tool

Post by PremalChheda »

I hate to poop on your great PMTAD find, but there is something out there that is even better and will last much much longer...
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socrates
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Re: The ultimate turning tool

Post by socrates »

PremalChheda wrote:I hate to poop on your great PMTAD find, but there is something out there that is even better and will last much much longer...
And that is??? :o
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PremalChheda
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Re: The ultimate turning tool

Post by PremalChheda »

socrates wrote:
PremalChheda wrote:I hate to poop on your great PMTAD find, but there is something out there that is even better and will last much much longer...
And that is??? :o
google.com

what is harder than carbide?
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RadDavis
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Re: The ultimate turning tool

Post by RadDavis »

You know what I hate? I hate when someone posts about a fantastic new pipe making tool they have found, and then, like some smug smartass, they tell us to use Google to find the fucking thing.

Post a fucking link.

Ridiculous.

Rad
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baweaverpipes
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Re: The ultimate turning tool

Post by baweaverpipes »

RadDavis wrote:You know what I hate? I hate when someone posts about a fantastic new pipe making tool they have found, and then, like some smug smartass, they tell us to use Google to find the fucking thing.

Post a fucking link.

Ridiculous.

Rad
I concur.
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Re: The ultimate turning tool

Post by LatakiaLover »

Let's see how long Premal can hold out in wind tunnel of combined Rad-hate and Bruce-hate... :lol:
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PremalChheda
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Re: The ultimate turning tool

Post by PremalChheda »

Problem is, I cannot find it myself...
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LatakiaLover
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Re: The ultimate turning tool

Post by LatakiaLover »

--- Digressive Comment for Tool Geeks ---

Regarding carbide insert cutters, I've used them for a long time, and several years ago put the following question to an "ask science" forum:
I use tungsten carbide cutters to shave a pedestrian (but pure) formulation of acrylic plastic in some cases, and hardened rubber (vulcanite) in others. They must be replaced periodically because they get dull. I don't get it. Why/how does the soft stuff ever remove so much as a molecule of the enormously harder one?

This was the reply:
Materials Scientist here.

Your problem is not due to the sharpness of your tool, nor the hardness of the tungsten carbide (WC) particles. First let me show you what your tool looks like up close:

http://i.imgur.com/YWr1g.png

The block particles are the very hard WC, and the matrix is actually just cobalt (Co). Advantages of a metal matrix composite include the advantages of the metal and ceramic, while trying to get rid of the metal and ceramic shortcomings. The cobalt is ductile, has a high fracture toughness, is easily formed and has high conductivity for dissipating heat. The WC ceramic maintains strength well as the temperature rises, has a high elastic moduli and is corrosion resistant.

The wear behavior of metal matrix composites is different from a single metallic counterpart because the composite materials have multiple constituents in their structure that wear at different rates. Under the low wear stresses (such as you probably encounter when cutting your PMMA), there is some abrasive wear. However as your tool cuts, "pull-out" of the WC reinforcement occurs and this increases the wear on your tool which is the biggest deciding factor.

The pull-out simply means the WC particles are literally being pulled out of the Co matrix in your tool blade. The hard particles themselves are not being deformed, they're simply leaving the tool as they are being "gripped" by the PMMA you are cutting. When the tool encounters something called a "critical wear stress", that means the stress at the WC-Co interface is too great for the bonding between the two components. The critical wear stress is simply a ratio between this interfacial strength between the Co matrix and WC particles, and the WC friction coefficient between the WC and the Co.

So let's take a look at what happens, and in what order:

1. The tool cuts the plastic and a minimal amount of wear on both the WC and the exposed Co matrix develops
2. Over time, a specific WC particle will be gripped by the plastic and a force will be exerted on it. This force will be parallel to the WC-Co interface, which puts a stress between these two phases.
3. Every once in a while, the stress is large enough to surpass the critical interfacial strength because the bonding between the WC and the Co is not strong enough, i.e. the friction between the two pieces is too small for the stress applied to the WC.
4. The WC particle will pull-out of the cobalt matrix, and some extra Co is exposed.
5. The strong, but not strong enough, Co matrix is exposed as the cutting surface, and it quickly erodes until the next WC particle is exposed for cutting.
6. Process repeats itself.

There have been numerous studies which blame the WC de-bonding and pullout as the main reason as to why tungsten carbide tools wear so quickly.

The solution? Better manufacturing and process methods, which will differ from company to company.
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RadDavis
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Re: The ultimate turning tool

Post by RadDavis »

George, they get dull for the same reason that razor blades get dull cutting your beard, or pocket knives get dull whittling cedar. It don't seem right, but that's the way it is.

Hope this helps.

Rad
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Sasquatch
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Re: The ultimate turning tool

Post by Sasquatch »

Entropy.

There it is. Now, that's big scale shit, and we could go on a long time as to why the arrow of time points only in one direction, and that is "Worse". We are anti-entropy machines, one sharpening at a time, but it costs the whole world. Rad's sharpening alone caused a huge iceberg to calve off Greenland earlier in the year.


Er, anyway, I agree with Wojtek (and fuck you Premal, you Indian wanna-be, with your lying, scheming "I know something better but it's a fucking secret you cocksuckers."), having just got a neat set of bits that take that sort of insert. Mine are triangular, and ALL the cutters in the set of six take the same insert. So I get three sharp bits each, and I can use all six on the same cutter (probably will too). This is leaving an almost-buffable surface on ebonite, and on briar I am sanding at 400 just... just cuz. No tearout.
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LatakiaLover
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Re: The ultimate turning tool

Post by LatakiaLover »

RadDavis wrote:George, they get dull for the same reason that razor blades get dull cutting your beard, or pocket knives get dull whittling cedar. It don't seem right, but that's the way it is.
Actually, the mechanism is not the same, which is why I asked a group of white coat & clipboard guys.

Razors and pocket knives have blade edges which are much softer than TC, plus they bend/deflect (curl over) onnaconna their thinness. (Which is why strops and steels work without removing material... they merely straighten (re-set) the still-sharp edge.

Carbide inserts are damn near diamond hard, have right angle (or close to it) edges, and are extremely rigid.

Your ToolGeek score (with D'Huber being negative zero, and Chas "I'm a proud Texan" Harbert being ten), is only a 2.5, I'm afraid. :(
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PremalChheda
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Re: The ultimate turning tool

Post by PremalChheda »

wdteipen wrote:Where can one purchase this magically imbued artifact?
Right click image

Select - Open image in another tab

Look at the address bar.

It's just simple internet/computer searching thingies you have to do to find something. I mean come on, its not as much work as figuring out how to make a pipe.
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PremalChheda
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Re: The ultimate turning tool

Post by PremalChheda »

Rad Davises and Bruce Weavers have blade edges which are much softer than TC, plus they bend/deflect (curl over) onnaconna their thinness. (Which is why strops and steels work without removing material... they merely straighten (re-set) the still-sharp edge.

George Diboses are damn near diamond hard, have right angle (or close to it) edges, and are extremely rigid.
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socrates
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Re: The ultimate turning tool

Post by socrates »

baweaverpipes wrote:
RadDavis wrote:You know what I hate? I hate when someone posts about a fantastic new pipe making tool they have found, and then, like some smug smartass, they tell us to use Google to find the fucking thing.

Post a fucking link.

Ridiculous.

Rad
I concur.
Frankly I also concur. It saddens me that a game had to be played. All that had to be said was "I know something that works better but can't remember what it's called". With some clues perhaps others here could have helped YOU.

I have always been happy with the help folks here have provided. Information sharing came easily from ALL then this. Whatever you know or forgot isn't something I really want to know. What I want to say I won't.
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