It's difficult to tell but the video doesn't look like a CCGT insert, more like CCMT? I'd expect the insert to be highly polished and with a distinct rake angle for CCGT. May be it's just that the screen definition isn't adequate. I haven't tried CCGT on bronze, CCMT works fine for me. I use CCGT on aluminium alloys and plastics.

Andrew

.

By the looks of that finish, Nick … you might try making a telescope mirror

… You just need a clever device to generate the parabolic tool-path !

MichaelG.

Here are examples of my inserts, CCMT on the left and CCGT on the right:

Both inserts are 09 size and 0.4mm nose radius. Manufacturer is Korloy. While details of the chip breaker will change, the basic form will remain the same across manufacturers. Two things to note for the insert on the right – it has a much sharper edge, and the rake angle is greater.

Andrew

But they still did the job OK. That's a positive (as well as the rake).

Dave
The Emerald Isle

Ground finish (GT) H13A is the recommended grade for non ferrous materials, especially aluminium, H10A is also a suitable substitute.

Emgee

Folks, All **GT inserts are not always polished as in Andrews pic, some are coated. I have some from Korloy and ARNO Werkzeuge that are coated [I will post a pic later when time permits ] Although whether coated or uncoated they all share the same high rake angle as shown in the right hand pic from Andrew. Nick_G ,yours certainly look to be CCMT. Because ** GT inserts are usually a bit more expensive than the standard **MT. the seller maybe tried [and maybe Succeeded ] in pulling a fast one. I dunno about that. Best to go through the Sandvik Coromant catalogue and find out. Although they look to be performing ok.

.

Would like to think that ^^^ but can't tell

The PDF only covers the first few pages … then on p9

If you want to view the next page please click HERE!

… but [at least on my iPad] the word HERE! is not hyperlinked.

Edited By Michael Gilligan on 07/04/2016 10:37:11

My expectation is that they will work fine on brass, but less so on aluminium, the two possible issues being BUE and chip breaking.

Andrew

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

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