[nervis1]

http://www.mmsonline.com/articles/0105ex1.html

Got this from another forum, figured some might like seeing this as much as I did.

Ingersol 300HP mill doing 20+ipm with a 24" face mill 0.75 DOC. Look at the size of those chips!

No coolant either?

[JFettig]

holy crapola, and I thought the 2" face mill running 40ipm through steel at .25" depth of cut in the haas at work was insane, we measured 380 degrees F off those chips

Jon

[Scott_bob]

Cool, er i should say Hot!

Yah, as much as we'd be tempted to hose that bad boy down with flood coolant, that would just kill those inserts. At high temperatures, thermal shock by flood coolant actually causes inserts to fracture due to be exposed to high heat (in the cut) then immediate cooling from the cold coolant. Better off just letting the carbide insert heat up and stay hot and hope the heat comes off in the chips. A bit of air blast is all you want to help out with evacuation...

Remember to consider thermal shock as one more cause of poor insert life.
I would not want to change the inserts in that holder, there must be a hundred of em

[nervis1]

Yea...thanks for the info, I was wondering why no coolant.

That face mill must have cost 5k...more?

Amazing. Is that as big as mills get or do they make them bigger?

I just don't think 300 HP is enough these days, if you really want to get any work done you need at least 500HP. LOL

[JFettig]

haha, yeah I know we dont run coolant on the face mills we run. we have a $700 3" face mill if that gives you any price idea, Im guessing with size goes an exponential price.
(meaning probably 20k for that Im guessing)

Jon