Help! > Mistakes, muckups, and dangerous behaviour

Long hot swarf

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redhouseluv:
Thanks all

I have attached some photos of the tool in question; I finished off by using a smaller CCMT tool with finer cuts and this gave a better finish and chips rather than long ribbons

internal_fire:

--- Quote from: redhouseluv on September 18, 2023, 08:37:44 AM ---I have attached some photos of the tool in question

--- End quote ---

W-style (Trigon) tooling is very strong, but is not the best for fine finishing. The edges tend to be stronger and blunter than those available for C-style and T-style inserts.

Even the sharpest available inserts, often designated by xF or FF in the latter part of the model number, are not as sharp as the "razor-edge" inserts available in the other shapes.

The "chipbreaker", which is common to many W-style inserts, really only works with heavy cuts. For anything less than, say, 0.010" the chipbreaker does nothing except make the curl tighter.

I use W-style inserts quite a bit, but for light cuts or fine finishing it is better to switch to a sharp insert or HSS.

Gene

Jasonb:
I would not generalise that all W shape inserts are not sharp, You can get them polished and ground for non ferrous and stainless steel that are a lot sharper than the pressed type you look to have there. Though the sharper is less likely you break the chips anyway.

https://www.shop-apt.co.uk/carbide-inserts-for-turning-aluminium-alloys-non-ferrous-metals-plastics/wnmg-060404-alu-ak10-carbide-inserts-for-turning-ground-and-polished-for-aluminium-uni-tip.html

internal_fire:

--- Quote from: Jasonb on September 18, 2023, 02:18:31 PM ---I would not generalise that all W shape inserts are not sharp, You can get them polished and ground for non ferrous and stainless steel that are a lot sharper than the pressed type you look to have there.

--- End quote ---

Interesting. I have looked at all the big guys like Sandvik, Kennametal, Iscar, Kyocera, Mitsubishi, etc., and I did not find anything like those.

Guess I should look elsewhere.  :embarassed:

Gene

bent:
In the first photo, it looks like the tip of the tool is damaged/broken, may have affected the performance as far as chip breaking.

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