Quote Originally Posted by chrisobrien07 View Post
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0.5in spindle:
having a larger collet will help vibrations as far as the advice I've been given goes... the chinese spindles i have seen only have a 0.5in n a 2.5Kw spindle. this is whole lot bigger than the 700w router I am using... but it would also be heavier and would just add to problems with the current machine.
The only thing a larger spindle can do for you is add mass, there is no magic in spindle capacity itself which can reduce vibration, only mass and rigidity will do that.
You can experiment with added mass with your existing spindle, there will be a sweet spot for each set of cutting conditions but more mass will always give some improvement as it's inertia will resist cutter deflection.

Looking at your video again your spindle mounting system could be massively improved by adding a second identical mounting ring and having the two as far apart as possible, your current mounting arrangement has almost no triangulation and will be a point of flex in the system.