Jasons tips

Hi Andrew, The CCGT inserts I prefer are the coated ones [ I will post a pic or 2 later on today ] some have a TiCN coating and the others are a combination of TiCN and TiAIN and I can report no problems with BUE on Aluminium . I have noticed it slightly on the un- coated types,but it hasn't [as of yet ] given me any problems. Although a lot would also depend on the type of Aluminium alloy. [amongst other things ]

Cheers.

As stated earlier H13A is the recommended grade for non ferrous materials, H10 has a finer grain structure and is also recommended for non ferrous and plastic materials,not all ground inserts have a polished surface, chip breaking will also be dependent on the grade of aluminium being cut, some are stringy whatever grade of insert or tip shape is used. Agree BUE can be a problem if no lubricant used.

Emgee

Edited By Emgee on 07/04/2016 11:28:28

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Here we go. I imagine you more knowing guy's will find the swarf shape tells the story.

Looks very similar swarf to what I get with similar shallow cuts in 6082.

The video actually shows the positive rake better than the photos as you can see that the corners of the tips rise up

The brighter tips that I use

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Hey.!!! .......... You have the same chuck as me.

How the hell did that happen.?

Nick

It's all a bit confusing, despite supposedly being standardised (ISO-1832 etc?). Naturally there is room for ambiguity and Sandvik (page I-14) and Korloy seem to take a different approach within the same general guidelines.

The first 2 (CC**) letters simply denote the shape and relief angle (80 degree rhombic and 7 degrees respectively). The 3rd character simply denotes a tolerance, not a sharpness or surface roughness parameter. The 4th letter denotes the "shape" of the insert, beyond those already defined, usually in section. The letter "X" seems to denote a "special" profile and that's what Sandvik chose to use to define their CCGT inserts to their own preference. Korloy on the other hand use the 4th letter to merely define the screw fixing and screw chamfer angle.

The chipbreaker definition defines the top rake angle more than any other bit of the part number. So Korloy use the "-AK" and "-AR" chipbreaker suffices to define their high rake (and usually polished) geometry. I suspect the -AK is what Andrew showed (the shiny one).

Bottom line, the Sandvik inserts seem to be CCGT indeed but these are not the aluminium / non-ferrous cutting flavour I suspect most of us thought were inferred by the CCGT part number. It's probably a fairly standard steel cutting insert although I don't see the "-UM" suffix anywhere. Perhaps I missed it?

For Sandvik, it appears you would need to order a CCGX060203 part and for Korloy you'd want a CCGT060203-AK or -AR.

Murray

Edited By Muzzer on 07/04/2016 13:40:53

Muzzer

H13 denotes recommended for non-ferrous as does H13A, H10 and H10A. Sandvik use this code for turning and milling inserts suitable for non-ferrous which also includes titanium.

The last 2 numbers in the code denote tip radius, as far as I can see thats in 02, 04, 08 rads, where did you get the 03 code ?

Emgee

Edited By Emgee on 07/04/2016 14:23:14

Edited By Emgee on 07/04/2016 14:25:01

Here are some pics I think a lot of folks thing that the **GT inserts are all shiny silver. These are some CCGT a WCGT and a CCGX note the various coatings.

Haha. Finger trouble / senior moment - well caught.

On the subject of insert size, where equipment allows, is there an advantage to using the 09 size over the 06 size?

I have small and larger tool holders for 2 different lathes, but all use the smaller 06 size tips so I can share the tips.

Would there be any advantage in buying alternative 09 size holders as well?

Thanks,

James

An old thread I know but one I remembered and decided to try some "GT" tips. Ordered a cheap circa £10 box from China, arrived today and I tried them on 304 stainless. Brilliant finish, I am well pleased.