Thread: Diamond Tool Holder

Originally Posted by bwal74

Hi,

I'm hearing what your saying Chris. I've got CCMT inserts (can't remember what size) and I don't think my little Hercus is rigid enough to utilise them properly. They are good for taking rough cuts off blackbar though but not so good at finishing cuts - poor finish mainly.

When you say CCGT, do you mean Cermite inserts (I think thats what they where called)? Generally lighter and more fragile than normal carbide inserts? When I used them on the Jessy Majors you had to really use high speeds and feeds but you got a really good finish - hence we generally only used them on finishing cuts.

I just watched the Eccentric engineering utube vids, they look really good.


Cheers Ben.

Ben, what you refer to are Sumitomo Cermet, these are not carbide inserts but ceramic inserts. I have never tried them (they are quite expensive, or were when I last looked) but heard only good things about them from users of small/light lathes.

CCGT are carbide, but look more like a surface coated mirror. If you cut steel/stainless you still need CCMT for the roughing, CCGT is only for fine finishing. On alu. brass. plastic CCGT can do both roughing and finish. But on steel the expensive CCGT would wear too fast for my wallet.

Originally Posted by cba_melbourne

Bob, exactly what I do. As CCGT's are pricy (the 6mm cost between $70 and 120 for a pack of 10) I try to use the two shallow angle tips too. What you want is a toolholder set from Glanze. Glanze makes affordable low cost toolholders for hobby use, but they are really good. It is the only India made tools that I can genuinely recommend - under one condition: you need to buy one good quality high tensile Torx screw for each insert. These screws are usually Swiss made and retail for about $2 each. If you use the India made soft screws that come with the toolholders, you qyickly damage the thread and can toss the toolholder goodbye. These Glanze sets contain the usual toolholders and a boring bar, plus two toolholders for facing and turning to use the two normally unused insert tips. Chris

My right hand toolholder is a Kennametal, made in one of the former Bloc countries, Bulgaria I think. I bought a lefty from CTC and was pleasantly surprised by the quality, every bit as well finished as the right hander. And at a fraction of the cost! Whilst I harbour reservations about sub continental quality, I'm not going to spark another us and them "debate" so given your endorsement Chris I will look at the Glance holders. Who have you purchased them from, Chronos?

Bob.

Ben,
I use an Eccentric Engineering DTH on my Hercus 260. It's really the only cutting tool I use for turning and facing. It's worth getting a Crobalt tool bit as well as the standard HSS one. The Crobalt cuts SS like butter.
Chris

Originally Posted by jack620

Ben,
I use an Eccentric Engineering DTH on my Hercus 260. It's really the only cutting tool I use for turning and facing. It's worth getting a Crobalt tool bit as well as the standard HSS one. The Crobalt cuts SS like butter.
Chris

Hi Jack,

Do you use the 9.5mm set or the 12mm set? I think its the 9.5mm for the 260 but I do want to make sure.

Thanks Ben.

Don't know if this helps Ben but I have a quick change tool post and the lathe requires 16mm tooling but the 12mm DTH fits about right.

Phil

Originally Posted by bwal74

Hi Jack,

Do you use the 9.5mm set or the 12mm set? I think its the 9.5mm for the 260 but I do want to make sure.

Thanks Ben.

Here's some correspondence I had from Gary at Eccentric. -

Hi Bob

Managed to find Michael C.....'s sales receipt and you were correct, he did buy a 12mm model tool holder and not the 9.5mm one for his Hercus 260, not sure what type tool post he uses though.

Here’s the relevant measurements for the two holders so you can see which one would fit best.
12mm DTH - minimum tool height 12mm, height of shank 15mm.
9.5mm DTH – minimum tool height 9.5mm, height of shank 12.7mm.
All the other measurements are exactly the same as they are made from the same casting, the smaller tool just has an extra 2.3mm milled off the bottom of the shank.


Cheers
Gary


I bought the 9.5 for my, smaller than the 260, 9.

Bob

Ben,
I bought the 12mm holder. It works in the original Hercus 4-way toolpost and my AXA size QCTP.
Chris

Originally Posted by Big Shed

Secondly. I have over time become quite proficient at grinding/sharpening my HSS virtually eliminating my need for this tool.

I now almost exclusively use HSS and am able to get a good finish on most materials, including SS, aluminium, brass, copper, 1214, Delrin and a variety of other plastic materials.

wish I could

Originally Posted by jack620

Ben,
I bought the 12mm holder. It works in the original Hercus 4-way toolpost and my AXA size QCTP.
Chris

What model Hercus, Chris?

Does a QCTP have an advantage, used in conjunction with the diamond toolholder?
Does the DTH have the ability to adjust height without use of shims?

Jordan

Originally Posted by nadroj

What model Hercus, Chris?

Does a QCTP have an advantage, used in conjunction with the diamond toolholder?
Does the DTH have the ability to adjust height without use of shims?

Jordan

JP

Shimless, the cutter can be adjusted in height by simply loosening the single clamping screw on the tool holder.

BT

Originally Posted by Anorak Bob

My right hand toolholder is a Kennametal, made in one of the former Bloc countries, Bulgaria I think. I bought a lefty from CTC and was pleasantly surprised by the quality, every bit as well finished as the right hander. And at a fraction of the cost! Whilst I harbour reservations about sub continental quality, I'm not going to spark another us and them "debate" so given your endorsement Chris I will look at the Glance holders. Who have you purchased them from, Chronos?
Bob.

Bob, bought my first Glanze set with 8mm shanks for CCMT 6mm inserts during a visit at Minitech in Brisbane in the late 90's. I still use that set on the smaller 8" swing lathe, and have no doubt these Glanze tools will outlast me. The second Glanze set I bought about 3 years ago for the Hercus 260, with 12mm shanks, from Chronos UK. The Chronos tools came already fitted with good quality high tensile torx screws. Note that the expensive 8mm CCMT Mitsubishi toolholders I bought in the 80's, as well as the 3 times cheaper Glanze toolholders are both made from soft, not hardened steel. The only difference is the finish, especially how the recess for the CCMT inserts is milled. On the Mitsubishi, the recess accurately matches all insert angles (as when looking at the insert from the side), whilst Glanze just mills rectangular shoulders. This may matter, if you use the toolholders in a 10HP CNC machining cente running 3 shifts..... but it is irrelevant on a <1HP hobbylathe. That is no typo, I have seen such cnc lathes use 8mm shank CCMT 6mm tools, and it is just unbelievable how fast such a tiny tool/toolholder can remove metal. I will NEVER again blame toolholder flex for any problem, 8mm shanks are good for at least 2HP. On light lathes, flex is always the machine (mostly the troolpost, topslide and cross slide), not the toolholder shaft.

Jordan,
I have a Hercus 260. As Bob says, the DTH cutter height is adjustable, so the QCTP offers no additional advantage.
Chris

Hi,

I just bought my birthday present. A 12mm DTH set with a extra Cobalt piece. My missus had no objections as it was her birthday earlier this month and I spent up big on her (6 p's or something??).

Cheers Ben.

Happy birthday Ben. Did you get a cobalt or Crobalt bit? One is HSS with cobalt, the other is an alloy of cobalt that contains no iron at all.