Thanks for the recommendation, the
is not only cheaper its 100w more powerful and I foresee the constant speed under load being very useful.
Is it possible to use these with an end mill? All the high speed spindles like the NSK ones on youtube mow through metal (they are quite a bit more powerful obviously) but if I took conservative cuts am I pushing my luck? I really only think the 3/8" spindle even with a steel adapter for mounting end mills might overload the bearings as it would be adding like 2.5" past the collet.