kevincnc

I saw your post before, with your spindle rebuild, I have just repaired one made new parts for it that was messed up, its a 2.2Kw, there are so many different manufactures that make them, some are well built, some are junk, the outside of these spindles is just a piece of tubing, if you look at your photos you will see it, so are easy to mess up if clamped in the wrong place

They are not designed to cut aluminum, the 2 front bearing both face the same way, & are preloaded by a spring & the bearing at the back, the whole spindle can float down a small amount if being used incorrect

If you use them for aluminum you should only expect do light cutting