Originally Posted by
joeavaerage
Hi,
if you look at the spec for VMCs out there you'll commonly see spindle powers of 10kW, 15kW at 12000 or 15000rpm.
Thus you could run this spindle very much slower, say 1000 rpm but still have about 8Nm torque. This is how VMC's can cut steel despite having
what seems an insanely fast spindle. The problem for you and I is that such spindles are huge, very expensive and require three phase power, not good
for hobbyists.
My approach to this problem is to have two spindles, one is 750W@24000 rpm, for engraving, aluminum etc and the other 1.8kW@3500rpm for steel.
Not a perfect solution but within my budget.
Craig