What, please. is an 'O' flute?

[GeneMpls]

I have spent time searching and have no gratification. Seems to be
one of those things that everyone just 'knows'? Thanks Gene

[gerryv]

Ditto.

I've seen them mentioned in literature saying what they're used for but it all assumes we know what the "O" stands for. That's the part that interests me especially so I can recognize one.

[dana_swift]

The "O" means "OPEN". That is the chip removal channel is extra large.

That makes the bit potentially weaker, so the bits are usually made with only one flute so there is more "meat" remaining in the bit cross section making the bit stronger.

When there is only one cutting edge the internal chip channel can be made even larger for what is called a "super o" or "super open" bit.

These bits are usually good at high feed rates because they can clear the chips.

There is an excellent explanation document on bits posted on the forum, I dont have the link at the moment. If nobody posts it, I will go find it again.

D

[feinddj]

Dana is right as usual. I would also point out that the channel of an O flute bit is round. Normal bits are milled with a hard corner that can get packed up with dust. O flutes don't have a corner so they get rid of the chips.

D

[GeneMpls]

Kehl beans- thank you gentlemen. Gene

[dana_swift]

Here is the tread on bits:

http://www.talkshopbot.com/forum/showpost.php?p=128710&postcount=1

[mikeacg]

I have never see this! Thanks Dana!

Mike

[andyb]

Here is another great source for info. From feed and speed rates to bit descriptions.

http://www.onsrud.com/plusdocs/Doc/index.html?model.code=Resources

Andy B.