Originally Posted by
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Addendum: I just had a thought. Here I am talking about the extra mass of an ER20 spindle and yet the same effect will be present using an ER11 adapter on a CT spindle, i.e. extra spinning mass on the flex shaft and cut motor. Of course any time I use the ER11 adapter I would be using small bits and by simple physics, the stresses would be smaller than using my Freud 1/2" shank, 1" diameter, 90° V-bit (one of my favorites for Centerline Text). So, though this may be a valid thought, I'm not sure how relevant to any machine damaging concerns it might be.
200k