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On a small shank cutter it's really not that big of a deal but when you get to a long shank to get down into the runners if you let it free spin it can and will bend over and "helicopter" right at the collet.

To much unsupported mass spinning at those speeds gets out of balance real quick. DAMHIK



Done it myself ... doooh ...



I have 2 12" long burrs and I made up a holder with
a bearing in it to hold the burr near the end... takes
2 hands to use the 12" cutters... I use to use a leather
glove to hold on to the shaft as close as possible
but it would get warm/hot on the glove