Quote Originally Posted by Web Goblin View Post
The spindle motor seems to be good quality, its certainly heavy enough. Some of the translation in the VFD manual is a bit dodgy though.
At least your manual is English...I googled and found one, probably the same as yours.

Have you measured the runout? I just measured mine, once with a 1/4" ground bar in the collet and also measured the runout of the tapered bore which the collet fits in. I got 0.1mm and 0.05mm respectively which is pretty poor. I think I need a new collet nut as it looks wobbly. When I first got the spindle I recall measuring 0.025mm runout. That's not fatal, but it gets annoying with small cutters.