"Newbie" wrote in message

|
| When you get into larger sizes and heavier work, do you want that large
bit
| spinning at 22,000 rpm on a hefty shank or a skinny one? That would be
like
| putting your 1/2 ton pickup on 13" wheels with 6.50 tires.


Well...don't bit designers keep some ratios in mind?

Sure, some bits are only made in 1/2" for that reason. Same principal
applies though, a larger diameter shank will always be superior in collet
holding, flex, shear strength, etc.