For me - I agree with Zumba
BUT
I have done some large aluminum parts with small diameter cutters. For instance a 3mm cutter carbide with AT coating should run at 38,000 RPM. I have a 10,000 RPM spindle. My machine cutting time was somewhere around 70 hours on this part. If I could have met SFM I would have saved 50 hours on that part. At 15,000 RPM I would have saved 17.5 hours.
You need to consider how much aluminum and how often small cutters.
I will only buy 40 taper or bigger and my next machine will have a 15K spindle.
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