Hi Frank

I'll check out the runout this evening. I think with most of the newer chinese spindles that are not the cheapest the runout is pretty low. I'm using some very fine 0.5mm end mills so this is important. Good quality collets are probably important too. It's no good having a spindle with no runout and a collet that is egg shaped !! I get the feeling that it's the weakest link in the chain that is important in cnc accuracy.

Cheers
Andrew