carbide tool radius

[kd0afk]

I'm looking at the boring bar from Mesa tools and it takes a piece TPGB insert. I'm also looking at a set of indexable turning tools from a different seller and they take TCMT inserts. I wrote Mesa and to ask if the TCMT inserts would work and he said that the radius of those inserts have a "huge radius".
What is generally considered huge? I tried looking up those bits in a catalog and can't even find TPGB inserts so I can't make a comparison.

 

[portlandron]

Don't have enough info to know the radius. There is are three numbers after the four letters. The last number is the radius.

The 1 letter tells the shape "T" = Triangle
The 2 letter tells the clearance "P" = 11 degree
The 3 letter tells the Tolerance
The 4 letter tells the Grove or hole "B" = Hole 70 to 90 degree countersink

This chart gives all the info: http://www.carbidedepot.com/formulas-insert-d.htm

 

[kd0afk]

Nevermind, he misread my question.
I think he thought I was referring to a round nose insert.

 

[Philjoe5]

This vendor, with whom I've never dealt, does have your insert in a range of radii, from 0.008" to 1/32".

http://toolinghouse.com/carbideinsertstcmt.aspx

My experience with CCMT inserts with 0.008" radius is that they chip very easily. For my work I generally stick to the largest radius of 1/32" to reduce that possibility. If I need a sharper tool, then I use HSS.

Hope this helps

Cheers,
Phil