@jfleser My 110V setup was only bench tested. I never actually mounted it in the machine because my circumstances changed and I was given the supplies I needed to go 220V (Great luck on my part.)
So I decided to go with a 220V spindle because I also want to be able to use the same outlet for my welder. (Not at the same time of course.)
That is why I have the essentially brand new spindle and VFD up for sale here:
I do know that it is very quiet and smooth… at least as far as a bench test. As to the quality of cuts I can’t personally attest. I do know that of all of the lower price spindles, this is the one most recommended. I believe the runout is .01mm. This one has the ER20 collet that will allow for larger bits.
There are other forum member here using this same setup. That is why I bought it.