Quote Originally Posted by Davek0974 View Post
Ok, yes it will certainly not go that low - i have the same spindle and its useless below 8000, this is the issue with HSS - it needs low speeds or it burns up. Try and find a wood router bit - usually carbide tipped etc.
How are folks using these spindles for Aluminum (or are they)? I would think that even with solid carbide 3-flute endmills, 8K would too fast.

Wallace